Repository: dragonflyoss/dragonfly

Issue:
Prefetch the whole data after the request with range completed
### Feature request:

When download a file with range, after a while, the following requests with other range may be sent to proxy.
So, prefetch the whole data will be very useful to save more time cost.

Currently, the requests with diff range are different task, we need merge them into a same task.

### Use case:

Desire:
request 1: http://example.com/file/a.tar.gz, range: 1024-4096, task id: task-1
request 2: http://example.com/file/a.tar.gz, range: 4096-8192, task id: task-1
request 3: http://example.com/file/a.tar.gz, range: 0-, task id: task-1

1. All request with same url, different range, use same task.
2. The daemon should download the special range first after start a peer task.



Discussion:
@fannaihao: Expect this  feature. 
It will improve the efficiency of remote random read produced by lazy-pull snapshotter (like Nydus)  a lot.@jim3ma: #1078 implements this feature.
TODO: prefetch the whole url after ranged request done.@gaius-qi: https://github.com/dragonflyoss/dragonfly/pull/1078

Solution patch:
diff --git a/.github/workflows/e2e.yml b/.github/workflows/e2e.yml
index 4f3ab76d..1f9cbcb4 100644
--- a/.github/workflows/e2e.yml
+++ b/.github/workflows/e2e.yml
@@ -70,6 +70,7 @@ jobs:
 
       - name: Run E2E test
         run: |
+          make build-e2e-sha256sum
           ginkgo -v -r --race --fail-fast --cover --trace --progress test/e2e -- --feature-gates=dfget-range=true
           cat coverprofile.out >> coverage.txt
 
diff --git a/.goreleaser.yml b/.goreleaser.yml
index ea460c9f..80803c76 100644
--- a/.goreleaser.yml
+++ b/.goreleaser.yml
@@ -1,5 +1,6 @@
 before:
   hooks:
+    - hack/update-version-gorelease.sh
     - go mod download
 
 builds:
@@ -11,6 +12,14 @@ builds:
       - darwin
     goarch:
       - amd64
+    ldflags:
+      - -X d7y.io/dragonfly/v2/version.Major={{ .Major }}
+      - -X d7y.io/dragonfly/v2/version.Minor={{ .Minor }}
+      - -X d7y.io/dragonfly/v2/version.GitVersion={{ .Tag }}
+      - -X d7y.io/dragonfly/v2/version.GitCommit={{ .ShortCommit }}
+      - -X d7y.io/dragonfly/v2/version.BuildTime={{ .Date }}
+      - -X "d7y.io/dragonfly/v2/version.Gotags=none"
+      - -X "d7y.io/dragonfly/v2/version.Gogcflags=none"
 
   - main: ./cmd/scheduler
     id: scheduler
@@ -20,6 +29,14 @@ builds:
       - darwin
     goarch:
       - amd64
+    ldflags:
+      - -X d7y.io/dragonfly/v2/version.Major={{ .Major }}
+      - -X d7y.io/dragonfly/v2/version.Minor={{ .Minor }}
+      - -X d7y.io/dragonfly/v2/version.GitVersion={{ .Tag }}
+      - -X d7y.io/dragonfly/v2/version.GitCommit={{ .ShortCommit }}
+      - -X d7y.io/dragonfly/v2/version.BuildTime={{ .Date }}
+      - -X "d7y.io/dragonfly/v2/version.Gotags=none"
+      - -X "d7y.io/dragonfly/v2/version.Gogcflags=none"
 
   - main: ./cmd/cdn
     id: cdn
@@ -29,6 +46,14 @@ builds:
       - darwin
     goarch:
       - amd64
+    ldflags:
+      - -X d7y.io/dragonfly/v2/version.Major={{ .Major }}
+      - -X d7y.io/dragonfly/v2/version.Minor={{ .Minor }}
+      - -X d7y.io/dragonfly/v2/version.GitVersion={{ .Tag }}
+      - -X d7y.io/dragonfly/v2/version.GitCommit={{ .ShortCommit }}
+      - -X d7y.io/dragonfly/v2/version.BuildTime={{ .Date }}
+      - -X "d7y.io/dragonfly/v2/version.Gotags=none"
+      - -X "d7y.io/dragonfly/v2/version.Gogcflags=none"
 
   - main: ./cmd/manager
     id: manager
@@ -38,6 +63,14 @@ builds:
       - darwin
     goarch:
       - amd64
+    ldflags:
+      - -X d7y.io/dragonfly/v2/version.Major={{ .Major }}
+      - -X d7y.io/dragonfly/v2/version.Minor={{ .Minor }}
+      - -X d7y.io/dragonfly/v2/version.GitVersion={{ .Tag }}
+      - -X d7y.io/dragonfly/v2/version.GitCommit={{ .ShortCommit }}
+      - -X d7y.io/dragonfly/v2/version.BuildTime={{ .Date }}
+      - -X "d7y.io/dragonfly/v2/version.Gotags=none"
+      - -X "d7y.io/dragonfly/v2/version.Gogcflags=none"
 
 archives:
   - name_template: "{{ .ProjectName }}-{{ .Version }}-{{ .Os }}-{{ .Arch }}"
diff --git a/Makefile b/Makefile
index 2546b7a9..a5c5199c 100644
--- a/Makefile
+++ b/Makefile
@@ -194,7 +194,11 @@ build-deb-dfget: build-linux-dfget
 # Generate dfget man page
 build-dfget-man-page:
 	@pandoc -s -t man ./docs/en/cli-reference/dfget.1.md -o ./docs/en/cli-reference/dfget.1
-.PHONY: build-man-page
+.PHONY: build-dfget-man-page
+
+build-e2e-sha256sum:
+	@GOOS=linux GOARCH=amd64 go build -o /tmp/sha256sum-offset test/tools/sha256sum-offset/main.go
+.PHONY: build-e2e-sha256sum
 
 # Run unittests
 test:
@@ -219,12 +223,12 @@ install-e2e-test:
 .PHONY: install-e2e-test
 
 # Run E2E tests
-e2e-test: install-e2e-test
+e2e-test: install-e2e-test build-e2e-sha256sum
 	@ginkgo -v -r --race --fail-fast --cover --trace --progress test/e2e
 .PHONY: e2e-test
 
 # Run E2E tests with coverage
-e2e-test-coverage: install-e2e-test
+e2e-test-coverage: install-e2e-test build-e2e-sha256sum
 	@ginkgo -v -r --race --fail-fast --cover --trace --progress test/e2e
 	@cat coverprofile.out >> coverage.txt
 .PHONY: e2e-test-coverage
@@ -311,6 +315,7 @@ help:
 	@echo "make build-scheduler                build scheduler"
 	@echo "make build-manager                  build manager"
 	@echo "make build-manager-console          build manager console"
+	@echo "make build-e2e-sha256sum            build sha256sum test tool"
 	@echo "make install-cdn                    install CDN"
 	@echo "make install-dfget                  install dfget"
 	@echo "make install-scheduler              install scheduler"
diff --git a/client/config/dfget.go b/client/config/dfget.go
index 4acddcf8..4f47d848 100644
--- a/client/config/dfget.go
+++ b/client/config/dfget.go
@@ -127,6 +127,11 @@ type ClientOption struct {
 	RecursiveAcceptRegex string `yaml:"acceptRegex,omitempty" mapstructure:"accept-regex,omitempty"`
 
 	RecursiveRejectRegex string `yaml:"rejectRegex,omitempty" mapstructure:"reject-regex,omitempty"`
+
+	KeepOriginalOffset bool `yaml:"keepOriginalOffset,omitempty" mapstructure:"original-offset,omitempty"`
+
+	// Range stands download range for url, like: 0-9, will download 10 bytes from 0 to 9 ([0:9])
+	Range string `yaml:"range,omitempty" mapstructure:"range,omitempty"`
 }
 
 func NewDfgetConfig() *ClientOption {
diff --git a/client/config/peerhost.go b/client/config/peerhost.go
index 4076b794..dba37d1a 100644
--- a/client/config/peerhost.go
+++ b/client/config/peerhost.go
@@ -199,6 +199,8 @@ type ProxyOption struct {
 	Proxies         []*Proxy        `mapstructure:"proxies" yaml:"proxies"`
 	HijackHTTPS     *HijackConfig   `mapstructure:"hijackHTTPS" yaml:"hijackHTTPS"`
 	DumpHTTPContent bool            `mapstructure:"dumpHTTPContent" yaml:"dumpHTTPContent"`
+	// ExtraRegistryMirrors add more mirror for different ports
+	ExtraRegistryMirrors []*RegistryMirror `mapstructure:"extraRegistryMirrors" yaml:"extraRegistryMirrors"`
 }
 
 func (p *ProxyOption) UnmarshalJSON(b []byte) error {
diff --git a/client/daemon/daemon.go b/client/daemon/daemon.go
index df2e7603..10930548 100644
--- a/client/daemon/daemon.go
+++ b/client/daemon/daemon.go
@@ -411,7 +411,6 @@ func (cd *clientDaemon) Serve() error {
 		// serve proxy sni service
 		if cd.Option.Proxy.HijackHTTPS != nil && len(cd.Option.Proxy.HijackHTTPS.SNI) > 0 {
 			for _, opt := range cd.Option.Proxy.HijackHTTPS.SNI {
-
 				listener, port, err := cd.prepareTCPListener(config.ListenOption{
 					TCPListen: opt,
 				}, false)
@@ -475,7 +474,7 @@ func (cd *clientDaemon) Serve() error {
 		// dynconfig register client daemon
 		cd.dynconfig.Register(cd)
 
-		// servce dynconfig
+		// serve dynconfig
 		g.Go(func() error {
 			if err := cd.dynconfig.Serve(); err != nil {
 				logger.Errorf("dynconfig start failed %v", err)
diff --git a/client/daemon/peer/peertask_conductor.go b/client/daemon/peer/peertask_conductor.go
index df65818b..6497b5bf 100644
--- a/client/daemon/peer/peertask_conductor.go
+++ b/client/daemon/peer/peertask_conductor.go
@@ -139,9 +139,18 @@ type peerTaskConductor struct {
 	limiter *rate.Limiter
 
 	startTime time.Time
+
+	// subtask only
+	parent *peerTaskConductor
+	rg     *clientutil.Range
 }
 
-func (ptm *peerTaskManager) newPeerTaskConductor(ctx context.Context, request *scheduler.PeerTaskRequest, limit rate.Limit) *peerTaskConductor {
+func (ptm *peerTaskManager) newPeerTaskConductor(
+	ctx context.Context,
+	request *scheduler.PeerTaskRequest,
+	limit rate.Limit,
+	parent *peerTaskConductor,
+	rg *clientutil.Range) *peerTaskConductor {
 	// use a new context with span info
 	ctx = trace.ContextWithSpan(context.Background(), trace.SpanFromContext(ctx))
 	ctx, span := tracer.Start(ctx, config.SpanPeerTask, trace.WithSpanKind(trace.SpanKindClient))
@@ -200,17 +209,22 @@ func (ptm *peerTaskManager) newPeerTaskConductor(ctx context.Context, request *s
 		completedLength:     atomic.NewInt64(0),
 		usedTraffic:         atomic.NewUint64(0),
 		SugaredLoggerOnWith: log,
+
+		parent: parent,
+		rg:     rg,
 	}
+
 	ptc.pieceTaskPoller = &pieceTaskPoller{
 		getPiecesMaxRetry: ptm.getPiecesMaxRetry,
 		peerTaskConductor: ptc,
 	}
+
 	return ptc
 }
 
 // register to scheduler, if error and disable auto back source, return error, otherwise return nil
 func (pt *peerTaskConductor) register() error {
-	logger.Debugf("request overview, pid: %s, url: %s, filter: %s, tag: %s, range: %s, digest: %s, header: %#v",
+	pt.Debugf("request overview, pid: %s, url: %s, filter: %s, tag: %s, range: %s, digest: %s, header: %#v",
 		pt.request.PeerId, pt.request.Url, pt.request.UrlMeta.Filter, pt.request.UrlMeta.Tag, pt.request.UrlMeta.Range, pt.request.UrlMeta.Digest, pt.request.UrlMeta.Header)
 	// trace register
 	regCtx, cancel := context.WithTimeout(pt.ctx, pt.peerTaskManager.schedulerOption.ScheduleTimeout.Duration)
@@ -224,7 +238,7 @@ func (pt *peerTaskConductor) register() error {
 		tinyData       *TinyData
 	)
 
-	logger.Infof("step 1: peer %s start to register", pt.request.PeerId)
+	pt.Infof("step 1: peer %s start to register", pt.request.PeerId)
 	schedulerClient := pt.peerTaskManager.schedulerClient
 
 	result, err := schedulerClient.RegisterPeerTask(regCtx, pt.request)
@@ -233,11 +247,11 @@ func (pt *peerTaskConductor) register() error {
 
 	if err != nil {
 		if err == context.DeadlineExceeded {
-			logger.Errorf("scheduler did not response in %s", pt.peerTaskManager.schedulerOption.ScheduleTimeout.Duration)
+			pt.Errorf("scheduler did not response in %s", pt.peerTaskManager.schedulerOption.ScheduleTimeout.Duration)
 		}
-		logger.Errorf("step 1: peer %s register failed: %s", pt.request.PeerId, err)
+		pt.Errorf("step 1: peer %s register failed: %s", pt.request.PeerId, err)
 		if pt.peerTaskManager.schedulerOption.DisableAutoBackSource {
-			logger.Errorf("register peer task failed: %s, peer id: %s, auto back source disabled", err, pt.request.PeerId)
+			pt.Errorf("register peer task failed: %s, peer id: %s, auto back source disabled", err, pt.request.PeerId)
 			pt.span.RecordError(err)
 			pt.cancel(base.Code_SchedError, err.Error())
 			return err
@@ -246,7 +260,7 @@ func (pt *peerTaskConductor) register() error {
 		// can not detect source or scheduler error, create a new dummy scheduler client
 		schedulerClient = &dummySchedulerClient{}
 		result = &scheduler.RegisterResult{TaskId: pt.taskID}
-		logger.Warnf("register peer task failed: %s, peer id: %s, try to back source", err, pt.request.PeerId)
+		pt.Warnf("register peer task failed: %s, peer id: %s, try to back source", err, pt.request.PeerId)
 	}
 
 	pt.Infof("register task success, SizeScope: %s", base.SizeScope_name[int32(result.SizeScope)])
@@ -371,10 +385,6 @@ func (pt *peerTaskConductor) backSource() {
 	backSourceCtx, backSourceSpan := tracer.Start(pt.ctx, config.SpanBackSource)
 	defer backSourceSpan.End()
 	pt.contentLength.Store(-1)
-	if err := pt.InitStorage(); err != nil {
-		pt.cancel(base.Code_ClientError, err.Error())
-		return
-	}
 	err := pt.pieceManager.DownloadSource(backSourceCtx, pt, pt.request)
 	if err != nil {
 		pt.Errorf("download from source error: %s", err)
@@ -408,25 +418,25 @@ func (pt *peerTaskConductor) pullPieces() {
 }
 
 func (pt *peerTaskConductor) storeTinyPeerTask() {
-	// TODO store tiny data asynchronous
 	l := int64(len(pt.tinyData.Content))
 	pt.SetContentLength(l)
 	pt.SetTotalPieces(1)
 	ctx := pt.ctx
 	var err error
 	storageDriver, err := pt.peerTaskManager.storageManager.RegisterTask(ctx,
-		storage.RegisterTaskRequest{
-			CommonTaskRequest: storage.CommonTaskRequest{
+		&storage.RegisterTaskRequest{
+			PeerTaskMetadata: storage.PeerTaskMetadata{
 				PeerID: pt.tinyData.PeerID,
 				TaskID: pt.tinyData.TaskID,
 			},
-			ContentLength: l,
-			TotalPieces:   1,
+			DesiredLocation: "",
+			ContentLength:   l,
+			TotalPieces:     1,
 			// TODO check digest
 		})
 	pt.storage = storageDriver
 	if err != nil {
-		logger.Errorf("register tiny data storage failed: %s", err)
+		pt.Errorf("register tiny data storage failed: %s", err)
 		pt.cancel(base.Code_ClientError, err.Error())
 		return
 	}
@@ -453,24 +463,24 @@ func (pt *peerTaskConductor) storeTinyPeerTask() {
 			},
 		})
 	if err != nil {
-		logger.Errorf("write tiny data storage failed: %s", err)
+		pt.Errorf("write tiny data storage failed: %s", err)
 		pt.cancel(base.Code_ClientError, err.Error())
 		return
 	}
 	if n != l {
-		logger.Errorf("write tiny data storage failed", n, l)
+		pt.Errorf("write tiny data storage failed, want: %d, wrote: %d", l, n)
 		pt.cancel(base.Code_ClientError, err.Error())
 		return
 	}
 
 	err = pt.UpdateStorage()
 	if err != nil {
-		logger.Errorf("update tiny data storage failed: %s", err)
+		pt.Errorf("update tiny data storage failed: %s", err)
 		pt.cancel(base.Code_ClientError, err.Error())
 		return
 	}
 
-	logger.Debugf("store tiny data, len: %d", l)
+	pt.Debugf("store tiny data, len: %d", l)
 	pt.PublishPieceInfo(0, uint32(l))
 }
 
@@ -645,13 +655,6 @@ func (pt *peerTaskConductor) pullSinglePiece() {
 	pt.contentLength.Store(int64(pt.singlePiece.PieceInfo.RangeSize))
 	pt.SetTotalPieces(1)
 	pt.SetPieceMd5Sign(digestutils.Sha256(pt.singlePiece.PieceInfo.PieceMd5))
-	if err := pt.InitStorage(); err != nil {
-		pt.cancel(base.Code_ClientError, err.Error())
-		span.RecordError(err)
-		span.SetAttributes(config.AttributePieceSuccess.Bool(false))
-		span.End()
-		return
-	}
 
 	request := &DownloadPieceRequest{
 		storage: pt.GetStorage(),
@@ -793,11 +796,7 @@ func (pt *peerTaskConductor) init(piecePacket *base.PiecePacket, pieceBufferSize
 	if piecePacket.ContentLength > -1 {
 		pt.span.SetAttributes(config.AttributeTaskContentLength.Int64(piecePacket.ContentLength))
 	}
-	if err := pt.InitStorage(); err != nil {
-		pt.span.RecordError(err)
-		pt.cancel(base.Code_ClientError, err.Error())
-		return nil, false
-	}
+
 	pc := pt.peerPacket.Load().(*scheduler.PeerPacket).ParallelCount
 	pieceRequestCh := make(chan *DownloadPieceRequest, pieceBufferSize)
 	for i := int32(0); i < pc; i++ {
@@ -1106,24 +1105,34 @@ func (pt *peerTaskConductor) reportFailResult(request *DownloadPieceRequest, res
 	span.End()
 }
 
-func (pt *peerTaskConductor) InitStorage() (err error) {
-	pt.lock.Lock()
-	defer pt.lock.Unlock()
-	// check storage for partial back source cases.
-	if pt.storage != nil {
-		return nil
-	}
+func (pt *peerTaskConductor) initStorage(desiredLocation string) (err error) {
 	// prepare storage
-	pt.storage, err = pt.storageManager.RegisterTask(pt.ctx,
-		storage.RegisterTaskRequest{
-			CommonTaskRequest: storage.CommonTaskRequest{
-				PeerID: pt.GetPeerID(),
-				TaskID: pt.GetTaskID(),
-			},
-			ContentLength: pt.GetContentLength(),
-			TotalPieces:   pt.GetTotalPieces(),
-			PieceMd5Sign:  pt.GetPieceMd5Sign(),
-		})
+	if pt.parent == nil {
+		pt.storage, err = pt.storageManager.RegisterTask(pt.ctx,
+			&storage.RegisterTaskRequest{
+				PeerTaskMetadata: storage.PeerTaskMetadata{
+					PeerID: pt.GetPeerID(),
+					TaskID: pt.GetTaskID(),
+				},
+				DesiredLocation: desiredLocation,
+				ContentLength:   pt.GetContentLength(),
+				TotalPieces:     pt.GetTotalPieces(),
+				PieceMd5Sign:    pt.GetPieceMd5Sign(),
+			})
+	} else {
+		pt.storage, err = pt.storageManager.RegisterSubTask(pt.ctx,
+			&storage.RegisterSubTaskRequest{
+				Parent: storage.PeerTaskMetadata{
+					PeerID: pt.parent.GetPeerID(),
+					TaskID: pt.parent.GetTaskID(),
+				},
+				SubTask: storage.PeerTaskMetadata{
+					PeerID: pt.GetPeerID(),
+					TaskID: pt.GetTaskID(),
+				},
+				Range: pt.rg,
+			})
+	}
 	if err != nil {
 		pt.Log().Errorf("register task to storage manager failed: %s", err)
 	}
diff --git a/client/daemon/peer/peertask_file.go b/client/daemon/peer/peertask_file.go
index 313702db..01e13230 100644
--- a/client/daemon/peer/peertask_file.go
+++ b/client/daemon/peer/peertask_file.go
@@ -22,6 +22,7 @@ import (
 	"go.opentelemetry.io/otel/trace"
 	"golang.org/x/time/rate"
 
+	"d7y.io/dragonfly/v2/client/clientutil"
 	"d7y.io/dragonfly/v2/client/config"
 	"d7y.io/dragonfly/v2/client/daemon/metrics"
 	"d7y.io/dragonfly/v2/client/daemon/storage"
@@ -33,11 +34,13 @@ import (
 
 type FileTaskRequest struct {
 	scheduler.PeerTaskRequest
-	Output            string
-	Limit             float64
-	DisableBackSource bool
-	Pattern           string
-	Callsystem        string
+	Output             string
+	Limit              float64
+	DisableBackSource  bool
+	Pattern            string
+	Callsystem         string
+	Range              *clientutil.Range
+	KeepOriginalOffset bool
 }
 
 // FileTask represents a peer task to download a file
@@ -84,16 +87,20 @@ func (ptm *peerTaskManager) newFileTask(
 	request *FileTaskRequest,
 	limit rate.Limit) (context.Context, *fileTask, error) {
 	metrics.FileTaskCount.Add(1)
-	ptc, err := ptm.getPeerTaskConductor(ctx, idgen.TaskID(request.Url, request.UrlMeta), &request.PeerTaskRequest, limit)
+
+	// prefetch parent request
+	var parent *peerTaskConductor
+	if ptm.enablePrefetch && request.Range != nil {
+		parent = ptm.prefetchParentTask(&request.PeerTaskRequest, request.Output)
+	}
+
+	taskID := idgen.TaskID(request.Url, request.UrlMeta)
+	ptc, err := ptm.getPeerTaskConductor(ctx, taskID, &request.PeerTaskRequest, limit, parent, request.Range, request.Output)
 	if err != nil {
 		return nil, nil, err
 	}
-	// prefetch parent request
-	if ptm.enablePrefetch && request.UrlMeta.Range != "" {
-		go ptm.prefetch(&request.PeerTaskRequest)
-	}
-	ctx, span := tracer.Start(ctx, config.SpanFileTask, trace.WithSpanKind(trace.SpanKindClient))
 
+	ctx, span := tracer.Start(ctx, config.SpanFileTask, trace.WithSpanKind(trace.SpanKindClient))
 	pt := &fileTask{
 		SugaredLoggerOnWith: ptc.SugaredLoggerOnWith,
 		ctx:                 ctx,
@@ -165,8 +172,9 @@ func (f *fileTask) storeToOutput() {
 				TaskID:      f.peerTaskConductor.GetTaskID(),
 				Destination: f.request.Output,
 			},
-			MetadataOnly: false,
-			TotalPieces:  f.peerTaskConductor.GetTotalPieces(),
+			MetadataOnly:   false,
+			TotalPieces:    f.peerTaskConductor.GetTotalPieces(),
+			OriginalOffset: f.request.KeepOriginalOffset,
 		})
 	if err != nil {
 		f.sendFailProgress(base.Code_ClientError, err.Error())
diff --git a/client/daemon/peer/peertask_manager.go b/client/daemon/peer/peertask_manager.go
index 3a804aec..0f824b45 100644
--- a/client/daemon/peer/peertask_manager.go
+++ b/client/daemon/peer/peertask_manager.go
@@ -18,6 +18,7 @@ package peer
 
 import (
 	"context"
+	"fmt"
 	"io"
 	"sync"
 
@@ -26,6 +27,7 @@ import (
 	"go.opentelemetry.io/otel/trace"
 	"golang.org/x/time/rate"
 
+	"d7y.io/dragonfly/v2/client/clientutil"
 	"d7y.io/dragonfly/v2/client/config"
 	"d7y.io/dragonfly/v2/client/daemon/metrics"
 	"d7y.io/dragonfly/v2/client/daemon/storage"
@@ -163,8 +165,11 @@ func (ptm *peerTaskManager) findPeerTaskConductor(taskID string) (*peerTaskCondu
 func (ptm *peerTaskManager) getPeerTaskConductor(ctx context.Context,
 	taskID string,
 	request *scheduler.PeerTaskRequest,
-	limit rate.Limit) (*peerTaskConductor, error) {
-	ptc, created, err := ptm.getOrCreatePeerTaskConductor(ctx, taskID, request, limit)
+	limit rate.Limit,
+	parent *peerTaskConductor,
+	rg *clientutil.Range,
+	desiredLocation string) (*peerTaskConductor, error) {
+	ptc, created, err := ptm.getOrCreatePeerTaskConductor(ctx, taskID, request, limit, parent, rg, desiredLocation)
 	if err != nil {
 		return nil, err
 	}
@@ -182,12 +187,15 @@ func (ptm *peerTaskManager) getOrCreatePeerTaskConductor(
 	ctx context.Context,
 	taskID string,
 	request *scheduler.PeerTaskRequest,
-	limit rate.Limit) (*peerTaskConductor, bool, error) {
+	limit rate.Limit,
+	parent *peerTaskConductor,
+	rg *clientutil.Range,
+	desiredLocation string) (*peerTaskConductor, bool, error) {
 	if ptc, ok := ptm.findPeerTaskConductor(taskID); ok {
 		logger.Debugf("peer task found: %s/%s", ptc.taskID, ptc.peerID)
 		return ptc, false, nil
 	}
-	ptc := ptm.newPeerTaskConductor(ctx, request, limit)
+	ptc := ptm.newPeerTaskConductor(ctx, request, limit, parent, rg)
 
 	ptm.conductorLock.Lock()
 	// double check
@@ -200,10 +208,11 @@ func (ptm *peerTaskManager) getOrCreatePeerTaskConductor(
 	ptm.runningPeerTasks.Store(taskID, ptc)
 	ptm.conductorLock.Unlock()
 	metrics.PeerTaskCount.Add(1)
-	return ptc, true, nil
+	logger.Debugf("peer task created: %s/%s", ptc.taskID, ptc.peerID)
+	return ptc, true, ptc.initStorage(desiredLocation)
 }
 
-func (ptm *peerTaskManager) prefetch(request *scheduler.PeerTaskRequest) {
+func (ptm *peerTaskManager) prefetchParentTask(request *scheduler.PeerTaskRequest, desiredLocation string) *peerTaskConductor {
 	req := &scheduler.PeerTaskRequest{
 		Url:         request.Url,
 		PeerId:      request.PeerId,
@@ -232,16 +241,22 @@ func (ptm *peerTaskManager) prefetch(request *scheduler.PeerTaskRequest) {
 	}
 
 	logger.Infof("prefetch peer task %s/%s", taskID, req.PeerId)
-	prefetch, err := ptm.getPeerTaskConductor(context.Background(), taskID, req, limit)
+	prefetch, err := ptm.getPeerTaskConductor(context.Background(), taskID, req, limit, nil, nil, desiredLocation)
 	if err != nil {
 		logger.Errorf("prefetch peer task %s/%s error: %s", prefetch.taskID, prefetch.peerID, err)
+		return nil
 	}
+
 	if prefetch != nil && prefetch.peerID == req.PeerId {
 		metrics.PrefetchTaskCount.Add(1)
 	}
+	return prefetch
 }
 
 func (ptm *peerTaskManager) StartFileTask(ctx context.Context, req *FileTaskRequest) (chan *FileTaskProgress, *TinyData, error) {
+	if req.KeepOriginalOffset && !ptm.enablePrefetch {
+		return nil, nil, fmt.Errorf("please enable prefetch when use original offset feature")
+	}
 	if ptm.enableMultiplex {
 		progress, ok := ptm.tryReuseFilePeerTask(ctx, req)
 		if ok {
@@ -285,7 +300,7 @@ func (ptm *peerTaskManager) StartStreamTask(ctx context.Context, req *StreamTask
 		}
 	}
 
-	pt, err := ptm.newStreamTask(ctx, peerTaskRequest)
+	pt, err := ptm.newStreamTask(ctx, peerTaskRequest, req.Range)
 	if err != nil {
 		return nil, nil, err
 	}
diff --git a/client/daemon/peer/peertask_reuse.go b/client/daemon/peer/peertask_reuse.go
index 228c3f59..ef7bb995 100644
--- a/client/daemon/peer/peertask_reuse.go
+++ b/client/daemon/peer/peertask_reuse.go
@@ -20,7 +20,6 @@ import (
 	"context"
 	"fmt"
 	"io"
-	"math"
 	"os"
 	"time"
 
@@ -34,7 +33,6 @@ import (
 	logger "d7y.io/dragonfly/v2/internal/dflog"
 	"d7y.io/dragonfly/v2/pkg/idgen"
 	"d7y.io/dragonfly/v2/pkg/rpc/base"
-	"d7y.io/dragonfly/v2/pkg/util/rangeutils"
 )
 
 var _ *logger.SugaredLoggerOnWith // pin this package for no log code generation
@@ -42,7 +40,12 @@ var _ *logger.SugaredLoggerOnWith // pin this package for no log code generation
 func (ptm *peerTaskManager) tryReuseFilePeerTask(ctx context.Context,
 	request *FileTaskRequest) (chan *FileTaskProgress, bool) {
 	taskID := idgen.TaskID(request.Url, request.UrlMeta)
-	reuse := ptm.storageManager.FindCompletedTask(taskID)
+	var reuse *storage.ReusePeerTask
+	if ptm.enablePrefetch && request.Range != nil {
+		reuse = ptm.storageManager.FindCompletedSubTask(taskID)
+	} else {
+		reuse = ptm.storageManager.FindCompletedTask(taskID)
+	}
 	var (
 		rg     *clientutil.Range // the range of parent peer task data to read
 		log    *logger.SugaredLoggerOnWith
@@ -55,16 +58,7 @@ func (ptm *peerTaskManager) tryReuseFilePeerTask(ctx context.Context,
 		if reuse == nil {
 			return nil, false
 		}
-		var r *rangeutils.Range
-		r, err = rangeutils.ParseRange(request.UrlMeta.Range, math.MaxInt)
-		if err != nil {
-			logger.Warnf("parse range %s error: %s", request.UrlMeta.Range, err)
-			return nil, false
-		}
-		rg = &clientutil.Range{
-			Start:  int64(r.StartIndex),
-			Length: int64(r.EndIndex - r.StartIndex + 1),
-		}
+		rg = request.Range
 	}
 
 	if rg == nil {
@@ -95,18 +89,19 @@ func (ptm *peerTaskManager) tryReuseFilePeerTask(ctx context.Context,
 	span.AddEvent("reuse peer task", trace.WithAttributes(config.AttributePeerID.String(reuse.PeerID)))
 
 	start := time.Now()
-	if rg == nil {
+	if rg == nil || request.KeepOriginalOffset {
 		storeRequest := &storage.StoreRequest{
 			CommonTaskRequest: storage.CommonTaskRequest{
 				PeerID:      reuse.PeerID,
 				TaskID:      taskID,
 				Destination: request.Output,
 			},
-			MetadataOnly: false,
-			StoreOnly:    true,
-			TotalPieces:  reuse.TotalPieces,
+			MetadataOnly:   false,
+			StoreDataOnly:  true,
+			TotalPieces:    reuse.TotalPieces,
+			OriginalOffset: request.KeepOriginalOffset,
 		}
-		err = ptm.storageManager.Store(context.Background(), storeRequest)
+		err = ptm.storageManager.Store(ctx, storeRequest)
 	} else {
 		err = ptm.storePartialFile(ctx, request, log, reuse, rg)
 	}
@@ -173,7 +168,12 @@ func (ptm *peerTaskManager) storePartialFile(ctx context.Context, request *FileT
 func (ptm *peerTaskManager) tryReuseStreamPeerTask(ctx context.Context,
 	request *StreamTaskRequest) (io.ReadCloser, map[string]string, bool) {
 	taskID := idgen.TaskID(request.URL, request.URLMeta)
-	reuse := ptm.storageManager.FindCompletedTask(taskID)
+	var reuse *storage.ReusePeerTask
+	if ptm.enablePrefetch && request.Range != nil {
+		reuse = ptm.storageManager.FindCompletedSubTask(taskID)
+	} else {
+		reuse = ptm.storageManager.FindCompletedTask(taskID)
+	}
 	var (
 		rg  *clientutil.Range // the range of parent peer task data to read
 		log *logger.SugaredLoggerOnWith
diff --git a/client/daemon/peer/peertask_stream.go b/client/daemon/peer/peertask_stream.go
index 00b60577..6ffc764a 100644
--- a/client/daemon/peer/peertask_stream.go
+++ b/client/daemon/peer/peertask_stream.go
@@ -64,20 +64,24 @@ type streamTask struct {
 
 func (ptm *peerTaskManager) newStreamTask(
 	ctx context.Context,
-	request *scheduler.PeerTaskRequest) (*streamTask, error) {
+	request *scheduler.PeerTaskRequest,
+	rg *clientutil.Range) (*streamTask, error) {
 	metrics.StreamTaskCount.Add(1)
 	var limit = rate.Inf
 	if ptm.perPeerRateLimit > 0 {
 		limit = ptm.perPeerRateLimit
 	}
-	ptc, err := ptm.getPeerTaskConductor(ctx, idgen.TaskID(request.Url, request.UrlMeta), request, limit)
-	if err != nil {
-		return nil, err
-	}
 
 	// prefetch parent request
-	if ptm.enablePrefetch && request.UrlMeta.Range != "" {
-		go ptm.prefetch(request)
+	var parent *peerTaskConductor
+	if ptm.enablePrefetch && rg != nil {
+		parent = ptm.prefetchParentTask(request, "")
+	}
+
+	taskID := idgen.TaskID(request.Url, request.UrlMeta)
+	ptc, err := ptm.getPeerTaskConductor(ctx, taskID, request, limit, parent, rg, "")
+	if err != nil {
+		return nil, err
 	}
 
 	ctx, span := tracer.Start(ctx, config.SpanStreamTask, trace.WithSpanKind(trace.SpanKindClient))
diff --git a/client/daemon/rpcserver/rpcserver.go b/client/daemon/rpcserver/rpcserver.go
index e078e0c1..b4832d3d 100644
--- a/client/daemon/rpcserver/rpcserver.go
+++ b/client/daemon/rpcserver/rpcserver.go
@@ -19,6 +19,7 @@ package rpcserver
 import (
 	"context"
 	"fmt"
+	"math"
 	"net"
 	"os"
 
@@ -37,6 +38,7 @@ import (
 	dfdaemongrpc "d7y.io/dragonfly/v2/pkg/rpc/dfdaemon"
 	dfdaemonserver "d7y.io/dragonfly/v2/pkg/rpc/dfdaemon/server"
 	"d7y.io/dragonfly/v2/pkg/rpc/scheduler"
+	"d7y.io/dragonfly/v2/pkg/util/rangeutils"
 )
 
 type Server interface {
@@ -143,11 +145,23 @@ func (m *server) Download(ctx context.Context,
 			PeerId:   idgen.PeerID(m.peerHost.Ip),
 			PeerHost: m.peerHost,
 		},
-		Output:            req.Output,
-		Limit:             req.Limit,
-		DisableBackSource: req.DisableBackSource,
-		Pattern:           req.Pattern,
-		Callsystem:        req.Callsystem,
+		Output:             req.Output,
+		Limit:              req.Limit,
+		DisableBackSource:  req.DisableBackSource,
+		Pattern:            req.Pattern,
+		Callsystem:         req.Callsystem,
+		KeepOriginalOffset: req.KeepOriginalOffset,
+	}
+	if len(req.UrlMeta.Range) > 0 {
+		r, err := rangeutils.ParseRange(req.UrlMeta.Range, math.MaxInt)
+		if err != nil {
+			err = fmt.Errorf("parse range %s error: %s", req.UrlMeta.Range, err)
+			return err
+		}
+		peerTask.Range = &clientutil.Range{
+			Start:  int64(r.StartIndex),
+			Length: int64(r.Length()),
+		}
 	}
 	log := logger.With("peer", peerTask.PeerId, "component", "downloadService")
 
diff --git a/client/daemon/storage/local_storage.go b/client/daemon/storage/local_storage.go
index 9855067f..ee2f9907 100644
--- a/client/daemon/storage/local_storage.go
+++ b/client/daemon/storage/local_storage.go
@@ -19,10 +19,12 @@ package storage
 import (
 	"context"
 	"encoding/json"
+	"fmt"
 	"io"
 	"os"
 	"path"
 	"sync"
+	"syscall"
 	"time"
 
 	"go.uber.org/atomic"
@@ -53,6 +55,8 @@ type localTaskStore struct {
 
 	// content stores tiny file which length less than 128 bytes
 	content []byte
+
+	subtasks map[PeerTaskMetadata]*localSubTaskStore
 }
 
 var _ TaskStorageDriver = (*localTaskStore)(nil)
@@ -63,6 +67,30 @@ func (t *localTaskStore) touch() {
 	t.lastAccess.Store(access)
 }
 
+func (t *localTaskStore) SubTask(req *RegisterSubTaskRequest) *localSubTaskStore {
+	subtask := &localSubTaskStore{
+		parent: t,
+		Range:  req.Range,
+		persistentMetadata: persistentMetadata{
+			TaskID:        req.SubTask.TaskID,
+			TaskMeta:      map[string]string{},
+			ContentLength: req.Range.Length,
+			TotalPieces:   -1,
+			PeerID:        req.SubTask.PeerID,
+			Pieces:        map[int32]PieceMetadata{},
+			PieceMd5Sign:  "",
+			DataFilePath:  "",
+			Done:          false,
+		},
+		SugaredLoggerOnWith: logger.With("task", req.SubTask.TaskID,
+			"parent", req.Parent.TaskID, "peer", req.SubTask.PeerID, "component", "localSubTaskStore"),
+	}
+	t.Lock()
+	t.subtasks[req.SubTask] = subtask
+	t.Unlock()
+	return subtask
+}
+
 func (t *localTaskStore) WritePiece(ctx context.Context, req *WritePieceRequest) (int64, error) {
 	t.touch()
 
@@ -261,6 +289,7 @@ func (t *localTaskStore) ReadAllPieces(ctx context.Context, req *ReadAllPiecesRe
 	if err != nil {
 		return nil, err
 	}
+
 	if req.Range == nil {
 		return file, nil
 	}
@@ -281,21 +310,28 @@ func (t *localTaskStore) Store(ctx context.Context, req *StoreRequest) error {
 	// Store is called in callback.Done, mark local task store done, for fast search
 	t.Done = true
 	t.touch()
-	if req.TotalPieces > 0 {
+	if req.TotalPieces > 0 && t.TotalPieces == -1 {
 		t.Lock()
 		t.TotalPieces = req.TotalPieces
 		t.Unlock()
 	}
-	if !req.StoreOnly {
+
+	if !req.StoreDataOnly {
 		err := t.saveMetadata()
 		if err != nil {
 			t.Warnf("save task metadata error: %s", err)
 			return err
 		}
 	}
+
 	if req.MetadataOnly {
 		return nil
 	}
+
+	if req.OriginalOffset {
+		return hardlink(t.SugaredLoggerOnWith, req.Destination, t.DataFilePath)
+	}
+
 	_, err := os.Stat(req.Destination)
 	if err == nil {
 		// remove exist file
@@ -370,6 +406,9 @@ func (t *localTaskStore) GetPieces(ctx context.Context, req *base.PieceTaskReque
 }
 
 func (t *localTaskStore) CanReclaim() bool {
+	if t.invalid.Load() {
+		return true
+	}
 	access := time.Unix(0, t.lastAccess.Load())
 	reclaim := access.Add(t.expireTime).Before(time.Now())
 	t.Debugf("reclaim check, last access: %v, reclaim: %v", access, reclaim)
@@ -388,6 +427,21 @@ func (t *localTaskStore) MarkReclaim() {
 	})
 	t.reclaimMarked.Store(true)
 	t.Infof("task %s/%s will be reclaimed, marked", t.TaskID, t.PeerID)
+
+	t.Lock()
+	var keys []PeerTaskMetadata
+	for key := range t.subtasks {
+		t.gcCallback(CommonTaskRequest{
+			PeerID: key.PeerID,
+			TaskID: key.TaskID,
+		})
+		t.Infof("sub task %s/%s will be reclaimed, marked", key.TaskID, key.PeerID)
+		keys = append(keys, key)
+	}
+	for _, key := range keys {
+		delete(t.subtasks, key)
+	}
+	t.Unlock()
 }
 
 func (t *localTaskStore) Reclaim() error {
@@ -509,3 +563,49 @@ func (l *limitedReadFile) WriteTo(w io.Writer) (n int64, err error) {
 	}
 	return io.Copy(w, l.reader)
 }
+
+func hardlink(log *logger.SugaredLoggerOnWith, dst, src string) error {
+	dstStat, err := os.Stat(dst)
+	if os.IsNotExist(err) {
+		// hard link
+		err = os.Link(src, dst)
+		if err != nil {
+			log.Errorf("hardlink from %q to %q error: %s", src, dst, err)
+			return err
+		}
+		log.Infof("hardlink from %q to %q success", src, dst)
+		return nil
+	}
+
+	if err != nil {
+		log.Errorf("stat %q error: %s", src, err)
+		return err
+	}
+
+	// target already exists, check inode
+	srcStat, err := os.Stat(src)
+	if err != nil {
+		log.Errorf("stat %q error: %s", src, err)
+		return err
+	}
+
+	dstSysStat, ok := dstStat.Sys().(*syscall.Stat_t)
+	if !ok {
+		log.Errorf("can not get inode for %q", dst)
+		return err
+	}
+
+	srcSysStat, ok := srcStat.Sys().(*syscall.Stat_t)
+	if ok {
+		log.Errorf("can not get inode for %q", src)
+		return err
+	}
+
+	if dstSysStat.Dev == srcSysStat.Dev && dstSysStat.Ino == srcSysStat.Ino {
+		log.Debugf("target inode match underlay data inode, skip hard link")
+		return nil
+	}
+
+	err = fmt.Errorf("target file %q exists, with different inode with underlay data %q", dst, src)
+	return err
+}
diff --git a/client/daemon/storage/local_storage_subtask.go b/client/daemon/storage/local_storage_subtask.go
new file mode 100644
index 00000000..b864fe02
--- /dev/null
+++ b/client/daemon/storage/local_storage_subtask.go
@@ -0,0 +1,379 @@
+/*
+ *     Copyright 2022 The Dragonfly Authors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package storage
+
+import (
+	"context"
+	"io"
+	"os"
+	"sync"
+
+	"go.uber.org/atomic"
+
+	"d7y.io/dragonfly/v2/client/clientutil"
+	logger "d7y.io/dragonfly/v2/internal/dflog"
+	"d7y.io/dragonfly/v2/pkg/rpc/base"
+	"d7y.io/dragonfly/v2/pkg/util/digestutils"
+)
+
+// TODO need refactor with localTaskStore, currently, localSubTaskStore code copies from localTaskStore
+type localSubTaskStore struct {
+	sync.RWMutex
+	persistentMetadata
+	*logger.SugaredLoggerOnWith
+	parent *localTaskStore
+
+	// when digest not match, invalid will be set
+	invalid atomic.Bool
+
+	Range *clientutil.Range
+}
+
+func (t *localSubTaskStore) WritePiece(ctx context.Context, req *WritePieceRequest) (int64, error) {
+	// piece already exists
+	t.RLock()
+	if piece, ok := t.Pieces[req.Num]; ok {
+		t.RUnlock()
+		// discard already downloaded data for back source
+		n, err := io.CopyN(io.Discard, req.Reader, piece.Range.Length)
+		if err != nil && err != io.EOF {
+			return n, err
+		}
+		if n != piece.Range.Length {
+			return n, ErrShortRead
+		}
+		return piece.Range.Length, nil
+	}
+	t.RUnlock()
+
+	// TODO different with localTaskStore
+	file, err := os.OpenFile(t.parent.DataFilePath, os.O_RDWR, defaultFileMode)
+	if err != nil {
+		return 0, err
+	}
+	defer file.Close()
+	// TODO different with localTaskStore
+	if _, err = file.Seek(t.Range.Start+req.Range.Start, io.SeekStart); err != nil {
+		return 0, err
+	}
+
+	n, err := io.Copy(file, io.LimitReader(req.Reader, req.Range.Length))
+	if err != nil {
+		return 0, err
+	}
+
+	// when UnknownLength and size is align to piece num
+	if req.UnknownLength && n == 0 {
+		t.Lock()
+		t.genDigest(n, req)
+		t.Unlock()
+		return 0, nil
+	}
+
+	if n != req.Range.Length {
+		if req.UnknownLength {
+			// when back source, and can not detect content length, we need update real length
+			req.Range.Length = n
+			// when n == 0, skip
+			if n == 0 {
+				t.Lock()
+				t.genDigest(n, req)
+				t.Unlock()
+				return 0, nil
+			}
+		} else {
+			return n, ErrShortRead
+		}
+	}
+
+	// when Md5 is empty, try to get md5 from reader, it's useful for back source
+	if req.PieceMetadata.Md5 == "" {
+		t.Debugf("piece md5 not found in metadata, read from reader")
+		if get, ok := req.Reader.(digestutils.DigestReader); ok {
+			req.PieceMetadata.Md5 = get.Digest()
+			t.Infof("read md5 from reader, value: %s", req.PieceMetadata.Md5)
+		} else {
+			t.Debugf("reader is not a DigestReader")
+		}
+	}
+
+	t.Debugf("wrote %d bytes to file %s, piece %d, start %d, length: %d",
+		n, t.DataFilePath, req.Num, req.Range.Start, req.Range.Length)
+	t.Lock()
+	defer t.Unlock()
+	// double check
+	if _, ok := t.Pieces[req.Num]; ok {
+		return n, nil
+	}
+	t.Pieces[req.Num] = req.PieceMetadata
+	t.genDigest(n, req)
+	return n, nil
+}
+
+func (t *localSubTaskStore) ReadPiece(ctx context.Context, req *ReadPieceRequest) (io.Reader, io.Closer, error) {
+	if t.invalid.Load() {
+		t.Errorf("invalid digest, refuse to get pieces")
+		return nil, nil, ErrInvalidDigest
+	}
+
+	// TODO different with localTaskStore
+	t.parent.touch()
+	file, err := os.Open(t.parent.DataFilePath)
+	if err != nil {
+		return nil, nil, err
+	}
+
+	// If req.Num is equal to -1, range has a fixed value.
+	if req.Num != -1 {
+		t.RLock()
+		if piece, ok := t.Pieces[req.Num]; ok {
+			t.RUnlock()
+			req.Range = piece.Range
+		} else {
+			t.RUnlock()
+			file.Close()
+			t.Errorf("invalid piece num: %d", req.Num)
+			return nil, nil, ErrPieceNotFound
+		}
+	}
+
+	// TODO different with localTaskStore
+	if _, err = file.Seek(t.Range.Start+req.Range.Start, io.SeekStart); err != nil {
+		file.Close()
+		t.Errorf("file seek failed: %v", err)
+		return nil, nil, err
+	}
+	// who call ReadPiece, who close the io.ReadCloser
+	return io.LimitReader(file, req.Range.Length), file, nil
+}
+
+func (t *localSubTaskStore) ReadAllPieces(ctx context.Context, req *ReadAllPiecesRequest) (io.ReadCloser, error) {
+	if t.invalid.Load() {
+		t.Errorf("invalid digest, refuse to read all pieces")
+		return nil, ErrInvalidDigest
+	}
+
+	t.parent.touch()
+
+	// who call ReadPiece, who close the io.ReadCloser
+	file, err := os.Open(t.parent.DataFilePath)
+	if err != nil {
+		return nil, err
+	}
+
+	var (
+		start  int64
+		length int64
+	)
+
+	if req.Range == nil {
+		start, length = t.Range.Start, t.Range.Length
+	} else {
+		start, length = t.Range.Start+req.Range.Start, t.Range.Length
+	}
+
+	if _, err = file.Seek(start, io.SeekStart); err != nil {
+		file.Close()
+		t.Errorf("file seek to %d failed: %v", start, err)
+		return nil, err
+	}
+
+	return &limitedReadFile{
+		reader: io.LimitReader(file, length),
+		closer: file,
+	}, nil
+}
+
+func (t *localSubTaskStore) GetPieces(ctx context.Context, req *base.PieceTaskRequest) (*base.PiecePacket, error) {
+	if t.invalid.Load() {
+		t.Errorf("invalid digest, refuse to get pieces")
+		return nil, ErrInvalidDigest
+	}
+
+	t.RLock()
+	defer t.RUnlock()
+	t.parent.touch()
+	piecePacket := &base.PiecePacket{
+		TaskId:        req.TaskId,
+		DstPid:        t.PeerID,
+		TotalPiece:    t.TotalPieces,
+		ContentLength: t.ContentLength,
+		PieceMd5Sign:  t.PieceMd5Sign,
+	}
+
+	if t.TotalPieces > -1 && int32(req.StartNum) >= t.TotalPieces {
+		t.Warnf("invalid start num: %d", req.StartNum)
+	}
+
+	for i := int32(0); i < int32(req.Limit); i++ {
+		if piece, ok := t.Pieces[int32(req.StartNum)+i]; ok {
+			piecePacket.PieceInfos = append(piecePacket.PieceInfos, &base.PieceInfo{
+				PieceNum:    piece.Num,
+				RangeStart:  uint64(piece.Range.Start),
+				RangeSize:   uint32(piece.Range.Length),
+				PieceMd5:    piece.Md5,
+				PieceOffset: piece.Offset,
+				PieceStyle:  piece.Style,
+			})
+		}
+	}
+	return piecePacket, nil
+}
+
+func (t *localSubTaskStore) UpdateTask(ctx context.Context, req *UpdateTaskRequest) error {
+	t.parent.touch()
+	t.Lock()
+	defer t.Unlock()
+	t.persistentMetadata.ContentLength = req.ContentLength
+	if req.TotalPieces > 0 {
+		t.TotalPieces = req.TotalPieces
+		t.Debugf("update total pieces: %d", t.TotalPieces)
+	}
+	if len(t.PieceMd5Sign) == 0 && len(req.PieceMd5Sign) > 0 {
+		t.PieceMd5Sign = req.PieceMd5Sign
+		t.Debugf("update piece md5 sign: %s", t.PieceMd5Sign)
+	}
+	return nil
+}
+
+func (t *localSubTaskStore) Store(ctx context.Context, req *StoreRequest) error {
+	// Store is called in callback.Done, mark local task store done, for fast search
+	t.Done = true
+	t.parent.touch()
+	if req.TotalPieces > 0 {
+		t.Lock()
+		t.TotalPieces = req.TotalPieces
+		t.Unlock()
+	}
+
+	if req.MetadataOnly {
+		return nil
+	}
+
+	if req.OriginalOffset {
+		return hardlink(t.SugaredLoggerOnWith, req.Destination, t.parent.DataFilePath)
+	}
+
+	_, err := os.Stat(req.Destination)
+	if err == nil {
+		// remove exist file
+		t.Infof("destination file %q exists, purge it first", req.Destination)
+		os.Remove(req.Destination)
+	}
+
+	file, err := os.Open(t.parent.DataFilePath)
+	if err != nil {
+		t.Debugf("open tasks data error: %s", err)
+		return err
+	}
+	defer file.Close()
+
+	_, err = file.Seek(t.Range.Start, io.SeekStart)
+	if err != nil {
+		t.Debugf("task seek file error: %s", err)
+		return err
+	}
+	dstFile, err := os.OpenFile(req.Destination, os.O_CREATE|os.O_RDWR|os.O_TRUNC, defaultFileMode)
+	if err != nil {
+		t.Errorf("open tasks destination file error: %s", err)
+		return err
+	}
+	defer dstFile.Close()
+	// copy_file_range is valid in linux
+	// https://go-review.googlesource.com/c/go/+/229101/
+	n, err := io.Copy(dstFile, io.LimitReader(file, t.ContentLength))
+	t.Debugf("copied tasks data %d bytes to %s", n, req.Destination)
+	return err
+}
+
+func (t *localSubTaskStore) ValidateDigest(req *PeerTaskMetadata) error {
+	t.Lock()
+	defer t.Unlock()
+	if t.persistentMetadata.PieceMd5Sign == "" {
+		t.invalid.Store(true)
+		return ErrDigestNotSet
+	}
+	if t.TotalPieces <= 0 {
+		t.Errorf("total piece count not set when validate digest")
+		t.invalid.Store(true)
+		return ErrPieceCountNotSet
+	}
+
+	var pieceDigests []string
+	for i := int32(0); i < t.TotalPieces; i++ {
+		pieceDigests = append(pieceDigests, t.Pieces[i].Md5)
+	}
+
+	digest := digestutils.Sha256(pieceDigests...)
+	if digest != t.PieceMd5Sign {
+		t.Errorf("invalid digest, desired: %s, actual: %s", t.PieceMd5Sign, digest)
+		t.invalid.Store(true)
+		return ErrInvalidDigest
+	}
+	return nil
+}
+
+func (t *localSubTaskStore) IsInvalid(req *PeerTaskMetadata) (bool, error) {
+	return t.invalid.Load(), nil
+}
+
+func (t *localSubTaskStore) genDigest(n int64, req *WritePieceRequest) {
+	if req.GenPieceDigest == nil || t.PieceMd5Sign != "" {
+		return
+	}
+
+	total, gen := req.GenPieceDigest(n)
+	if !gen {
+		return
+	}
+	t.TotalPieces = total
+
+	var pieceDigests []string
+	for i := int32(0); i < t.TotalPieces; i++ {
+		pieceDigests = append(pieceDigests, t.Pieces[i].Md5)
+	}
+
+	digest := digestutils.Sha256(pieceDigests...)
+	t.PieceMd5Sign = digest
+	t.Infof("generated digest: %s", digest)
+}
+
+func (t *localSubTaskStore) CanReclaim() bool {
+	if t.parent.Done || t.invalid.Load() {
+		return true
+	}
+
+	return false
+}
+
+func (t *localSubTaskStore) MarkReclaim() {
+	t.parent.gcCallback(CommonTaskRequest{
+		PeerID: t.PeerID,
+		TaskID: t.TaskID,
+	})
+	t.Infof("sub task %s/%s will be reclaimed, marked", t.TaskID, t.PeerID)
+	t.parent.Lock()
+	delete(t.parent.subtasks, PeerTaskMetadata{
+		PeerID: t.PeerID,
+		TaskID: t.TaskID,
+	})
+	t.parent.Unlock()
+}
+
+func (t *localSubTaskStore) Reclaim() error {
+	return nil
+}
diff --git a/client/daemon/storage/metadata.go b/client/daemon/storage/metadata.go
index 28e64412..90d8b32e 100644
--- a/client/daemon/storage/metadata.go
+++ b/client/daemon/storage/metadata.go
@@ -56,10 +56,11 @@ type CommonTaskRequest struct {
 }
 
 type RegisterTaskRequest struct {
-	CommonTaskRequest
-	ContentLength int64
-	TotalPieces   int32
-	PieceMd5Sign  string
+	PeerTaskMetadata
+	DesiredLocation string
+	ContentLength   int64
+	TotalPieces     int32
+	PieceMd5Sign    string
 }
 
 type WritePieceRequest struct {
@@ -74,19 +75,29 @@ type WritePieceRequest struct {
 type StoreRequest struct {
 	CommonTaskRequest
 	MetadataOnly bool
-	StoreOnly    bool
-	TotalPieces  int32
+	// StoreDataOnly stands save file only without save metadata, used in reuse cases
+	StoreDataOnly bool
+	TotalPieces   int32
+	// OriginalOffset stands keep original offset in the target file, if the target file is not original file, return error
+	OriginalOffset bool
 }
 
 type ReadPieceRequest struct {
 	PeerTaskMetadata
 	PieceMetadata
 }
+
 type ReadAllPiecesRequest struct {
 	PeerTaskMetadata
 	Range *clientutil.Range
 }
 
+type RegisterSubTaskRequest struct {
+	Parent  PeerTaskMetadata
+	SubTask PeerTaskMetadata
+	Range   *clientutil.Range
+}
+
 type UpdateTaskRequest struct {
 	PeerTaskMetadata
 	ContentLength int64
diff --git a/client/daemon/storage/storage_manager.go b/client/daemon/storage/storage_manager.go
index 832d23bb..29c7f7d1 100644
--- a/client/daemon/storage/storage_manager.go
+++ b/client/daemon/storage/storage_manager.go
@@ -84,9 +84,13 @@ type Manager interface {
 	// KeepAlive tests if storage is used in given time duration
 	clientutil.KeepAlive
 	// RegisterTask registers a task in storage driver
-	RegisterTask(ctx context.Context, req RegisterTaskRequest) (TaskStorageDriver, error)
+	RegisterTask(ctx context.Context, req *RegisterTaskRequest) (TaskStorageDriver, error)
+	// RegisterSubTask registers a subtask in storage driver
+	RegisterSubTask(ctx context.Context, req *RegisterSubTaskRequest) (TaskStorageDriver, error)
 	// FindCompletedTask try to find a completed task for fast path
 	FindCompletedTask(taskID string) *ReusePeerTask
+	// FindCompletedSubTask try to find a completed subtask for fast path
+	FindCompletedSubTask(taskID string) *ReusePeerTask
 	// CleanUp cleans all storage data
 	CleanUp()
 }
@@ -119,8 +123,12 @@ type storageManager struct {
 	dataPathStat       *syscall.Stat_t
 	gcCallback         func(CommonTaskRequest)
 	gcInterval         time.Duration
+
 	indexRWMutex       sync.RWMutex
 	indexTask2PeerTask map[string][]*localTaskStore // key: task id, value: slice of localTaskStore
+
+	subIndexRWMutex       sync.RWMutex
+	subIndexTask2PeerTask map[string][]*localSubTaskStore // key: task id, value: slice of localSubTaskStore
 }
 
 var _ gc.GC = (*storageManager)(nil)
@@ -155,13 +163,14 @@ func NewStorageManager(storeStrategy config.StoreStrategy, opt *config.StorageOp
 	}
 
 	s := &storageManager{
-		KeepAlive:          clientutil.NewKeepAlive("storage manager"),
-		storeStrategy:      storeStrategy,
-		storeOption:        opt,
-		dataPathStat:       stat.Sys().(*syscall.Stat_t),
-		gcCallback:         gcCallback,
-		gcInterval:         time.Minute,
-		indexTask2PeerTask: map[string][]*localTaskStore{},
+		KeepAlive:             clientutil.NewKeepAlive("storage manager"),
+		storeStrategy:         storeStrategy,
+		storeOption:           opt,
+		dataPathStat:          stat.Sys().(*syscall.Stat_t),
+		gcCallback:            gcCallback,
+		gcInterval:            time.Minute,
+		indexTask2PeerTask:    map[string][]*localTaskStore{},
+		subIndexTask2PeerTask: map[string][]*localSubTaskStore{},
 	}
 
 	for _, o := range moreOpts {
@@ -192,7 +201,7 @@ func WithGCInterval(gcInterval time.Duration) func(*storageManager) error {
 	}
 }
 
-func (s *storageManager) RegisterTask(ctx context.Context, req RegisterTaskRequest) (TaskStorageDriver, error) {
+func (s *storageManager) RegisterTask(ctx context.Context, req *RegisterTaskRequest) (TaskStorageDriver, error) {
 	ts, ok := s.LoadTask(
 		PeerTaskMetadata{
 			PeerID: req.PeerID,
@@ -216,6 +225,36 @@ func (s *storageManager) RegisterTask(ctx context.Context, req RegisterTaskReque
 	return s.CreateTask(req)
 }
 
+func (s *storageManager) RegisterSubTask(ctx context.Context, req *RegisterSubTaskRequest) (TaskStorageDriver, error) {
+	t, ok := s.LoadTask(
+		PeerTaskMetadata{
+			PeerID: req.Parent.PeerID,
+			TaskID: req.Parent.TaskID,
+		})
+	if !ok {
+		return nil, fmt.Errorf("task %s not found", req.Parent.TaskID)
+	}
+
+	subtask := t.(*localTaskStore).SubTask(req)
+	s.subIndexRWMutex.Lock()
+	if ts, ok := s.subIndexTask2PeerTask[req.SubTask.TaskID]; ok {
+		ts = append(ts, subtask)
+		s.subIndexTask2PeerTask[req.SubTask.TaskID] = ts
+	} else {
+		s.subIndexTask2PeerTask[req.SubTask.TaskID] = []*localSubTaskStore{subtask}
+	}
+	s.subIndexRWMutex.Unlock()
+
+	s.Lock()
+	s.tasks.Store(
+		PeerTaskMetadata{
+			PeerID: req.SubTask.PeerID,
+			TaskID: req.SubTask.TaskID,
+		}, subtask)
+	s.Unlock()
+	return subtask, nil
+}
+
 func (s *storageManager) WritePiece(ctx context.Context, req *WritePieceRequest) (int64, error) {
 	t, ok := s.LoadTask(
 		PeerTaskMetadata{
@@ -225,7 +264,7 @@ func (s *storageManager) WritePiece(ctx context.Context, req *WritePieceRequest)
 	if !ok {
 		return 0, ErrTaskNotFound
 	}
-	return t.(TaskStorageDriver).WritePiece(ctx, req)
+	return t.WritePiece(ctx, req)
 }
 
 func (s *storageManager) ReadPiece(ctx context.Context, req *ReadPieceRequest) (io.Reader, io.Closer, error) {
@@ -238,7 +277,7 @@ func (s *storageManager) ReadPiece(ctx context.Context, req *ReadPieceRequest) (
 		// TODO recover for local task persistentMetadata data
 		return nil, nil, ErrTaskNotFound
 	}
-	return t.(TaskStorageDriver).ReadPiece(ctx, req)
+	return t.ReadPiece(ctx, req)
 }
 
 func (s *storageManager) ReadAllPieces(ctx context.Context, req *ReadAllPiecesRequest) (io.ReadCloser, error) {
@@ -251,7 +290,7 @@ func (s *storageManager) ReadAllPieces(ctx context.Context, req *ReadAllPiecesRe
 		// TODO recover for local task persistentMetadata data
 		return nil, ErrTaskNotFound
 	}
-	return t.(TaskStorageDriver).ReadAllPieces(ctx, req)
+	return t.ReadAllPieces(ctx, req)
 }
 
 func (s *storageManager) Store(ctx context.Context, req *StoreRequest) error {
@@ -264,7 +303,7 @@ func (s *storageManager) Store(ctx context.Context, req *StoreRequest) error {
 		// TODO recover for local task persistentMetadata data
 		return ErrTaskNotFound
 	}
-	return t.(TaskStorageDriver).Store(ctx, req)
+	return t.Store(ctx, req)
 }
 
 func (s *storageManager) GetPieces(ctx context.Context, req *base.PieceTaskRequest) (*base.PiecePacket, error) {
@@ -276,7 +315,7 @@ func (s *storageManager) GetPieces(ctx context.Context, req *base.PieceTaskReque
 	if !ok {
 		return nil, ErrTaskNotFound
 	}
-	return t.(TaskStorageDriver).GetPieces(ctx, req)
+	return t.GetPieces(ctx, req)
 }
 
 func (s *storageManager) LoadTask(meta PeerTaskMetadata) (TaskStorageDriver, bool) {
@@ -297,10 +336,10 @@ func (s *storageManager) UpdateTask(ctx context.Context, req *UpdateTaskRequest)
 	if !ok {
 		return ErrTaskNotFound
 	}
-	return t.(TaskStorageDriver).UpdateTask(ctx, req)
+	return t.UpdateTask(ctx, req)
 }
 
-func (s *storageManager) CreateTask(req RegisterTaskRequest) (TaskStorageDriver, error) {
+func (s *storageManager) CreateTask(req *RegisterTaskRequest) (TaskStorageDriver, error) {
 	s.Keep()
 	logger.Debugf("init local task storage, peer id: %s, task id: %s", req.PeerID, req.TaskID)
 
@@ -320,6 +359,7 @@ func (s *storageManager) CreateTask(req RegisterTaskRequest) (TaskStorageDriver,
 		dataDir:          dataDir,
 		metadataFilePath: path.Join(dataDir, taskMetadata),
 		expireTime:       s.storeOption.TaskExpireTime.Duration,
+		subtasks:         map[PeerTaskMetadata]*localSubTaskStore{},
 
 		SugaredLoggerOnWith: logger.With("task", req.TaskID, "peer", req.PeerID, "component", "localTaskStore"),
 	}
@@ -334,7 +374,7 @@ func (s *storageManager) CreateTask(req RegisterTaskRequest) (TaskStorageDriver,
 	t.metadataFile = metadata
 
 	// fallback to simple strategy for proxy
-	if req.Destination == "" {
+	if req.DesiredLocation == "" {
 		t.StoreStrategy = string(config.SimpleLocalTaskStoreStrategy)
 	}
 	data := path.Join(dataDir, taskData)
@@ -347,7 +387,7 @@ func (s *storageManager) CreateTask(req RegisterTaskRequest) (TaskStorageDriver,
 		}
 		f.Close()
 	case string(config.AdvanceLocalTaskStoreStrategy):
-		dir, file := path.Split(req.Destination)
+		dir, file := path.Split(req.DesiredLocation)
 		dirStat, err := os.Stat(dir)
 		if err != nil {
 			return nil, err
@@ -431,6 +471,39 @@ func (s *storageManager) FindCompletedTask(taskID string) *ReusePeerTask {
 	return nil
 }
 
+func (s *storageManager) FindCompletedSubTask(taskID string) *ReusePeerTask {
+	s.subIndexRWMutex.RLock()
+	defer s.subIndexRWMutex.RUnlock()
+	ts, ok := s.subIndexTask2PeerTask[taskID]
+	if !ok {
+		return nil
+	}
+	for _, t := range ts {
+		if t.invalid.Load() {
+			continue
+		}
+		// touch it before marking reclaim
+		t.parent.touch()
+		// already marked, skip
+		if t.parent.reclaimMarked.Load() {
+			continue
+		}
+
+		if !t.Done {
+			continue
+		}
+		return &ReusePeerTask{
+			PeerTaskMetadata: PeerTaskMetadata{
+				PeerID: t.PeerID,
+				TaskID: taskID,
+			},
+			ContentLength: t.ContentLength,
+			TotalPieces:   t.TotalPieces,
+		}
+	}
+	return nil
+}
+
 func (s *storageManager) cleanIndex(taskID, peerID string) {
 	s.indexRWMutex.Lock()
 	defer s.indexRWMutex.Unlock()
@@ -450,6 +523,25 @@ func (s *storageManager) cleanIndex(taskID, peerID string) {
 	s.indexTask2PeerTask[taskID] = remain
 }
 
+func (s *storageManager) cleanSubIndex(taskID, peerID string) {
+	s.subIndexRWMutex.Lock()
+	defer s.subIndexRWMutex.Unlock()
+	ts, ok := s.subIndexTask2PeerTask[taskID]
+	if !ok {
+		return
+	}
+	var remain []*localSubTaskStore
+	// FIXME switch instead copy
+	for _, t := range ts {
+		if t.PeerID == peerID {
+			logger.Debugf("clean index for %s/%s", taskID, peerID)
+			continue
+		}
+		remain = append(remain, t)
+	}
+	s.subIndexTask2PeerTask[taskID] = remain
+}
+
 func (s *storageManager) ValidateDigest(req *PeerTaskMetadata) error {
 	t, ok := s.LoadTask(
 		PeerTaskMetadata{
@@ -459,7 +551,7 @@ func (s *storageManager) ValidateDigest(req *PeerTaskMetadata) error {
 	if !ok {
 		return ErrTaskNotFound
 	}
-	return t.(TaskStorageDriver).ValidateDigest(req)
+	return t.ValidateDigest(req)
 }
 
 func (s *storageManager) IsInvalid(req *PeerTaskMetadata) (bool, error) {
@@ -471,7 +563,7 @@ func (s *storageManager) IsInvalid(req *PeerTaskMetadata) (bool, error) {
 	if !ok {
 		return false, ErrTaskNotFound
 	}
-	return t.(TaskStorageDriver).IsInvalid(req)
+	return t.IsInvalid(req)
 }
 
 func (s *storageManager) ReloadPersistentTask(gcCallback GCCallback) error {
@@ -602,17 +694,21 @@ func (s *storageManager) ReloadPersistentTask(gcCallback GCCallback) error {
 }
 
 func (s *storageManager) TryGC() (bool, error) {
+	// FIXME gc subtask
 	var markedTasks []PeerTaskMetadata
 	var totalNotMarkedSize int64
 	s.tasks.Range(func(key, task interface{}) bool {
-		if task.(*localTaskStore).CanReclaim() {
-			task.(*localTaskStore).MarkReclaim()
+		if task.(Reclaimer).CanReclaim() {
+			task.(Reclaimer).MarkReclaim()
 			markedTasks = append(markedTasks, key.(PeerTaskMetadata))
 		} else {
-			// just calculate not reclaimed task
-			totalNotMarkedSize += task.(*localTaskStore).ContentLength
-			logger.Debugf("task %s/%s not reach gc time",
-				key.(PeerTaskMetadata).TaskID, key.(PeerTaskMetadata).PeerID)
+			lts, ok := task.(*localTaskStore)
+			if ok {
+				// just calculate not reclaimed task
+				totalNotMarkedSize += lts.ContentLength
+				logger.Debugf("task %s/%s not reach gc time",
+					key.(PeerTaskMetadata).TaskID, key.(PeerTaskMetadata).PeerID)
+			}
 		}
 		return true
 	})
@@ -632,7 +728,10 @@ func (s *storageManager) TryGC() (bool, error) {
 		var tasks []*localTaskStore
 		s.tasks.Range(func(key, val interface{}) bool {
 			// skip reclaimed task
-			task := val.(*localTaskStore)
+			task, ok := val.(*localTaskStore)
+			if !ok { // skip subtask
+				return true
+			}
 			if task.reclaimMarked.Load() {
 				return true
 			}
@@ -669,14 +768,21 @@ func (s *storageManager) TryGC() (bool, error) {
 		if !ok {
 			continue
 		}
-		task := t.(*localTaskStore)
 		_, span := tracer.Start(context.Background(), config.SpanPeerGC)
-		span.SetAttributes(config.AttributePeerID.String(task.PeerID))
-		span.SetAttributes(config.AttributeTaskID.String(task.TaskID))
-
 		s.tasks.Delete(key)
-		s.cleanIndex(task.TaskID, task.PeerID)
-		if err := task.Reclaim(); err != nil {
+
+		if lts, ok := t.(*localTaskStore); ok {
+			span.SetAttributes(config.AttributePeerID.String(lts.PeerID))
+			span.SetAttributes(config.AttributeTaskID.String(lts.TaskID))
+			s.cleanIndex(lts.TaskID, lts.PeerID)
+		} else {
+			task := t.(*localSubTaskStore)
+			span.SetAttributes(config.AttributePeerID.String(task.PeerID))
+			span.SetAttributes(config.AttributeTaskID.String(task.TaskID))
+			s.cleanSubIndex(task.TaskID, task.PeerID)
+		}
+
+		if err := t.(Reclaimer).Reclaim(); err != nil {
 			// FIXME: retry later or push to queue
 			logger.Errorf("gc task %s/%s error: %s", key.TaskID, key.PeerID, err)
 			span.RecordError(err)
@@ -706,9 +812,14 @@ func (s *storageManager) forceGC() (bool, error) {
 	s.tasks.Range(func(key, task interface{}) bool {
 		meta := key.(PeerTaskMetadata)
 		s.tasks.Delete(meta)
-		s.cleanIndex(meta.TaskID, meta.PeerID)
-		task.(*localTaskStore).MarkReclaim()
-		err := task.(*localTaskStore).Reclaim()
+		if _, ok := task.(*localTaskStore); ok {
+			s.cleanIndex(meta.TaskID, meta.PeerID)
+		} else {
+			s.cleanSubIndex(meta.TaskID, meta.PeerID)
+		}
+
+		task.(Reclaimer).MarkReclaim()
+		err := task.(Reclaimer).Reclaim()
 		if err != nil {
 			logger.Errorf("gc task store %s error: %s", key, err)
 		}
diff --git a/client/dfget/dfget.go b/client/dfget/dfget.go
index 1c229b5a..a5680468 100644
--- a/client/dfget/dfget.go
+++ b/client/dfget/dfget.go
@@ -125,7 +125,7 @@ func singleDownload(ctx context.Context, client daemonclient.DaemonClient, cfg *
 		}
 	}
 
-	if downError != nil {
+	if downError != nil && !cfg.KeepOriginalOffset {
 		wLog.Warnf("daemon downloads file error: %v", downError)
 		fmt.Printf("daemon downloads file error: %v\n", downError)
 		downError = downloadFromSource(ctx, cfg, hdr)
@@ -213,6 +213,8 @@ func newDownRequest(cfg *config.DfgetConfig, hdr map[string]string) *dfdaemon.Do
 	var rg string
 	if r, ok := hdr[headers.Range]; ok {
 		rg = strings.TrimLeft(r, "bytes=")
+	} else {
+		rg = cfg.Range
 	}
 	return &dfdaemon.DownRequest{
 		Url:               cfg.URL,
@@ -227,10 +229,11 @@ func newDownRequest(cfg *config.DfgetConfig, hdr map[string]string) *dfdaemon.Do
 			Filter: cfg.Filter,
 			Header: hdr,
 		},
-		Pattern:    cfg.Pattern,
-		Callsystem: cfg.CallSystem,
-		Uid:        int64(basic.UserID),
-		Gid:        int64(basic.UserGroup),
+		Pattern:            cfg.Pattern,
+		Callsystem:         cfg.CallSystem,
+		Uid:                int64(basic.UserID),
+		Gid:                int64(basic.UserGroup),
+		KeepOriginalOffset: cfg.KeepOriginalOffset,
 	}
 }
 
diff --git a/cmd/dfget/cmd/root.go b/cmd/dfget/cmd/root.go
index bc623d22..70da8d18 100644
--- a/cmd/dfget/cmd/root.go
+++ b/cmd/dfget/cmd/root.go
@@ -182,6 +182,12 @@ func init() {
 	flagSet.String("reject-regex", dfgetConfig.RecursiveRejectRegex,
 		`Recursively download only. Specify a regular expression to reject the complete URL. In this case, you have to enclose the pattern into quotes to prevent your shell from expanding it`)
 
+	flagSet.Bool("original-offset", dfgetConfig.KeepOriginalOffset,
+		`Range request only. Download ranged data into target file with original offset. Daemon will make a hardlink to target file. Client can download many ranged data into one file for same url. When enabled, back source in client will be disabled`)
+
+	flagSet.String("range", dfgetConfig.Range,
+		`Download range. Like: 0-9, stands download 10 bytes from 0 -9, [0:9] in real url`)
+
 	// Bind cmd flags
 	if err := viper.BindPFlags(flagSet); err != nil {
 		panic(errors.Wrap(err, "bind dfget flags to viper"))
diff --git a/deploy/docker-compose/config/.gitignore b/deploy/docker-compose/config/.gitignore
index fcb647e1..567181b3 100644
--- a/deploy/docker-compose/config/.gitignore
+++ b/deploy/docker-compose/config/.gitignore
@@ -1,3 +1,6 @@
 cdn.json
 cdn.yaml
 dfget.yaml
+manager.yaml
+scheduler.yaml
+
diff --git a/deploy/docker-compose/config/scheduler.yaml b/deploy/docker-compose/config/scheduler.yaml
index dc0c7a18..ea982f2c 100644
--- a/deploy/docker-compose/config/scheduler.yaml
+++ b/deploy/docker-compose/config/scheduler.yaml
@@ -1,19 +1,130 @@
-verbose: true
-
+# server scheduler instance configuration
 server:
+  # # ip
+  ip: 0.0.0.0
+  # # host
+  # host: localhost
+  # port is the ip and port scheduler server listens on.
   port: 8002
+  # limit the number of requests
+  listenLimit: 10000
+  # cacheDir is dynconfig cache storage directory
+  # in linux, default value is /var/cache/dragonfly
+  # in macos(just for testing), default value is /Users/$USER/.dragonfly/cache
+  cacheDir: ""
+  # logDir is the log storage directory
+  # in linux, default value is /var/log/dragonfly
+  # in macos(just for testing), default value is /Users/$USER/.dragonfly/logs
+  logDir: ""
+
+# scheduler policy configuration
+scheduler:
+  # algorithm configuration to use different scheduling algorithms,
+  # default configuration supports "default" and "ml"
+  # "default" is the rule-based scheduling algorithm,
+  # "ml" is the machine learning scheduling algorithm
+  # It also supports user plugin extension, the algorithm value is "plugin",
+  # and the compiled `d7y-scheduler-plugin-evaluator.so` file is added to
+  # the dragonfly working directory plugins
+  algorithm: default
+  # backSourceCount is the number of backsource clients
+  # when the CDN is unavailable
+  backSourceCount: 3
+  # retry scheduling back-to-source limit times
+  retryBackSourceLimit: 5
+  # retry scheduling limit times
+  retryLimit: 20
+  # retry scheduling interval
+  retryInterval: 200ms
+  # gc metadata configuration
+  gc:
+    # peerGCInterval is peer's gc interval
+    peerGCInterval: 10m
+    # peerTTL is peer's TTL duration
+    peerTTL: 24h
+    # taskGCInterval is task's gc interval
+    taskGCInterval: 10m
+    # taskTTL is task's TTL duration
+    taskTTL: 24h
+    # hostGCInterval is host's gc interval
+    hostGCInterval: 30m
+    # hostTTL is host's TTL duration
+    hostTTL: 48h
 
-worker:
-  workerNum: 4
-  workerJobPoolSize: 10000
-  senderNum: 10
-  senderJobPoolSize: 10000
+# dynamic data configuration
+dynConfig:
+  # dynamic config refresh interval
+  refreshInterval: 1m
 
+# scheduler host configuration
+host:
+  # idc is the idc of scheduler instance
+  idc: ""
+  # netTopology is the net topology of scheduler instance
+  netTopology: ""
+  # location is the location of scheduler instance
+  location: ""
+
+# manager configuration
 manager:
-  enable: false
+  # addr manager access address
+  addr: "172.18.191.244:65003"
+  # schedulerClusterID cluster id to which scheduler instance belongs
+  schedulerClusterID: "1"
+  # keepAlive keep alive configuration
+  keepAlive:
+    # interval
+    interval: 5s
+
+# cdn configuration
+cdn:
+  # scheduler enable cdn as P2P peer,
+  # if the value is false, P2P network will not be back-to-source through
+  # cdn but by dfdaemon and preheat feature does not work
+  enable: true
 
+# machinery async job configuration,
+# see https://github.com/RichardKnop/machinery
 job:
+  # scheduler enable job service
   enable: false
+  # number of workers in global queue
+  globalWorkerNum: 1
+  # number of workers in scheduler queue
+  schedulerWorkerNum: 1
+  # number of workers in local queue
+  localWorkerNum: 5
+  # redis configuration
+  redis:
+    # host
+    host: "172.18.191.244"
+    # port
+    port: 6379
+    # password
+    password: ""
+    # brokerDB
+    brokerDB: 1
+    # backendDB
+    backendDB: 2
+
+# enable prometheus metrics
+metrics:
+  # scheduler enable metrics service
+  enable: false
+  # metrics service address
+  addr: ":8000"
+  # enable peer host metrics
+  enablePeerHost: false
+
+# console shows log on console
+console: true
+
+# whether to enable debug level logger and enable pprof
+verbose: true
+
+# listen port for pprof, only valid when the verbose option is true
+# default is -1. If it is 0, pprof will use a random port.
+pprof-port: -1
 
-dynconfig:
-  cdnDir: /opt/dragonfly/scheduler-cdn
+# jaeger endpoint url, like: http://jaeger.dragonfly.svc:14268/api/traces
+jaeger: ""
\ No newline at end of file
diff --git a/deploy/docker-compose/docker-compose.yaml b/deploy/docker-compose/docker-compose.yaml
index 16a1ac92..e08868cd 100644
--- a/deploy/docker-compose/docker-compose.yaml
+++ b/deploy/docker-compose/docker-compose.yaml
@@ -1,32 +1,95 @@
-version: "3.9"
+version: "3"
 services:
+  redis:
+    image: redis:6-alpine
+    container_name: redis
+    network_mode: host
+    command: >
+      --requirepass dragonfly
+    healthcheck:
+      test: ["CMD", "redis-cli","-a","dragonfly","ping"]
+      interval: 1s
+      timeout: 3s
+      retries: 30
+
+  mysql:
+    image: mariadb:10.6
+    container_name: mysql
+    network_mode: host
+    environment:
+      - MARIADB_USER=dragonfly
+      - MARIADB_PASSWORD=dragonfly
+      - MARIADB_DATABASE=manager
+      - MARIADB_ALLOW_EMPTY_ROOT_PASSWORD=yes
+    healthcheck:
+      test: ["CMD-SHELL", "mysqladmin status"]
+      interval: 1s
+      timeout: 3s
+      retries: 30
+
+  manager:
+    image: dragonflyoss/manager:v2.0.2-rc.9
+    container_name: manager
+    network_mode: host
+    depends_on:
+      - redis
+      - mysql
+    restart: always
+    volumes:
+      - /tmp/log/dragonfly:/var/log/dragonfly
+      - ./config/manager.yaml:/etc/dragonfly/manager.yaml
+    healthcheck:
+      test: ["CMD-SHELL", "nc -z 127.0.0.1 8080 || exit 1"]
+      interval: 1s
+      timeout: 3s
+      retries: 30
+
   dfdaemon:
-    image: dragonflyoss/dfdaemon:v2.0.1
+    image: dragonflyoss/dfdaemon:v2.0.2-rc.9
     depends_on:
-    - scheduler
-    - cdn
+      - scheduler
+      - cdn
     container_name: dfdaemon
     network_mode: host
+    restart: always
+    healthcheck:
+      test: ["CMD-SHELL", "nc -z 127.0.0.1 65001 || exit 1"]
+      interval: 1s
+      timeout: 3s
+      retries: 30
     volumes:
-    - /tmp/log/dragonfly:/var/log/dragonfly
-    - ./config/dfget.yaml:/etc/dragonfly/dfget.yaml
+      - /tmp/log/dragonfly:/var/log/dragonfly
+      - ./config/dfget.yaml:/etc/dragonfly/dfget.yaml
 
   scheduler:
-    image: dragonflyoss/scheduler:v2.0.1
+    image: dragonflyoss/scheduler:v2.0.2-rc.9
     depends_on:
-    - cdn
+      - cdn
+      - manager
     container_name: scheduler
     network_mode: host
+    restart: always
+    healthcheck:
+      test: ["CMD-SHELL", "nc -z 127.0.0.1 8002 || exit 1"]
+      interval: 1s
+      timeout: 3s
+      retries: 30
     volumes:
-    - /tmp/log/dragonfly:/var/log/dragonfly
-    - ./config/scheduler.yaml:/etc/dragonfly/scheduler.yaml
-    - ./config/cdn.json:/opt/dragonfly/scheduler-cdn/cdn.json
+      - /tmp/log/dragonfly:/var/log/dragonfly
+      - ./config/scheduler.yaml:/etc/dragonfly/scheduler.yaml
+      - ./config/cdn.json:/opt/dragonfly/scheduler-cdn/cdn.json
 
   cdn:
-    image: dragonflyoss/cdn:v2.0.1
+    image: dragonflyoss/cdn:v2.0.2-rc.9
     container_name: cdn
     network_mode: host
+    restart: always
+    healthcheck:
+      test: ["CMD-SHELL", "nc -z 127.0.0.1 8001 || exit 1"]
+      interval: 1s
+      timeout: 3s
+      retries: 30
     volumes:
-    - /tmp/log/dragonfly:/var/log/dragonfly
-    - ./config/cdn.yaml:/etc/dragonfly/cdn.yaml
-    - ./config/nginx.conf:/etc/nginx/nginx.conf
+      - /tmp/log/dragonfly:/var/log/dragonfly
+      - ./config/cdn.yaml:/etc/dragonfly/cdn.yaml
+      - ./config/nginx.conf:/etc/nginx/nginx.conf
diff --git a/deploy/docker-compose/run.sh b/deploy/docker-compose/run.sh
index c371acce..e0f5eee5 100755
--- a/deploy/docker-compose/run.sh
+++ b/deploy/docker-compose/run.sh
@@ -14,6 +14,8 @@ prepare(){
     cat template/cdn.template.json > config/cdn.json
     cat template/cdn.template.yaml > config/cdn.yaml
     cat template/dfget.template.yaml > config/dfget.yaml
+    cat template/scheduler.template.yaml > config/scheduler.yaml
+    cat template/manager.template.yaml > config/manager.yaml
 
     ip=${IP:-$(hostname -i)}
     hostname=$(hostname)
@@ -21,6 +23,8 @@ prepare(){
     sed -i "s,__IP__,$ip," config/cdn.json
     sed -i "s,__IP__,$ip," config/dfget.yaml
     sed -i "s,__IP__,$ip," config/cdn.yaml
+    sed -i "s,__IP__,$ip," config/scheduler.yaml
+    sed -i "s,__IP__,$ip," config/manager.yaml
 
     sed -i "s,__HOSTNAME__,$hostname," config/cdn.json
 }
@@ -62,7 +66,24 @@ case "$1" in
 
   *)
     if [ -z "$1" ]; then
+
+        # start all of docker-compose defined service
         docker-compose up -d
+
+        # docker-compose version 3 depends_on does not wait for redis and mysql to be “ready” before starting manager ...
+        # doc https://docs.docker.com/compose/compose-file/compose-file-v3/#depends_on
+        for i in $(seq 0 10); do
+          service_num=$(docker-compose ps --services |wc -l)
+          ready_num=$(docker-compose ps | grep healthy | wc -l)
+           if [ "$service_num" -eq "$ready_num" ]; then
+             break
+           fi
+           echo "wait for all service ready: $ready_num/$service_num,$i times check"
+           sleep 2
+        done
+
+        # print service list info
+        docker-compose ps
         exit 0
     fi
     echo "unknown argument: $1"
diff --git a/deploy/docker-compose/template/cdn.template.yaml b/deploy/docker-compose/template/cdn.template.yaml
index 67d45932..53d1c13c 100644
--- a/deploy/docker-compose/template/cdn.template.yaml
+++ b/deploy/docker-compose/template/cdn.template.yaml
@@ -5,7 +5,6 @@ base:
   # listenPort is the port cdn server listens on.
   # default: 8003
   listenPort: 8003
-  advertiseIP: __IP__
 
   # DownloadPort is the port for download files from cdn.
   # And you should start a file server firstly which listens on the download port.
@@ -17,12 +16,12 @@ base:
   systemReservedBandwidth: 20M
 
   # MaxBandwidth is the network bandwidth that cdn can use.
-  # default: 200 MB, in format of G(B)/g/M(B)/m/K(B)/k/B, pure number will also be parsed as Byte.
-  maxBandwidth: 1024M
+  # default: 1G, in format of G(B)/g/M(B)/m/K(B)/k/B, pure number will also be parsed as Byte.
+  maxBandwidth: 1G
 
-  # Whether to enable profiler
-  # default: false
-  enableProfiler: false
+  # AdvertiseIP is used to set the ip that we advertise to other peer in the p2p-network.
+  # By default, the first non-loop address is advertised.
+  advertiseIP: __IP__
 
   # FailAccessInterval is the interval time after failed to access the URL.
   # If a task failed to be downloaded from the source, it will not be retried in the time since the last failure.
@@ -37,37 +36,90 @@ base:
   # default: 2m0s
   gcMetaInterval: 2m
 
-  # gcStorageInterval is the interval time to execute GC storage.
-  # default: 15s
-  gcStorageInterval: 15s
-
   # TaskExpireTime when a task is not accessed within the taskExpireTime,
   # and it will be treated to be expired.
   # default: 3m0s
   taskExpireTime: 3m
 
-  # StoragePattern is the pattern of storage policy, [disk/hybrid]
-  storagePattern: disk
+  # storageMode is the Mode of storage policy, [disk/hybrid]
+  storageMode: disk
+
+
+  # logDir is the log storage directory
+  # in linux, default value is /var/log/dragonfly
+  # in macos(just for testing), default value is /Users/$USER/.dragonfly/logs
+  logDir: ""
+
+  # manager configuration
+  manager:
+    addr: "__IP__:65003"
+    cdnClusterID: "1"
+    keepAlive:
+      interval: 5s
+
+  # host configuration
+  host:
+    location:
+    idc:
+
+  # enable prometheus metrics
+  # metrics:
+  #  # metrics service address
+  #  addr: ":8000"
 
-  # Console shows log on console
-  console: false
 
 plugins:
   storageDriver:
-  - name: disk
-    enable: true
-    config:
-      baseDir: /tmp/cdn
-  storageManager:
-  - name: disk
-    enable: true
-    config:
-      gcInitialDelay: 5s
-      gcInterval: 15s
-      driverConfigs:
-        disk:
-          gcConfig:
-            youngGCThreshold: 100G
-            fullGCThreshold: 5G
-            cleanRatio: 1
-            intervalThreshold: 2h
+    - name: disk
+      enable: true
+      config:
+        baseDir: /tmp/cdn
+
+  storagemanager:
+    - name: disk
+      enable: true
+      config:
+        gcInitialDelay: 0s
+        gcInterval: 15s
+        driverConfigs:
+          disk:
+            gcConfig:
+              youngGCThreshold: 100.0GB
+              fullGCThreshold: 5.0GB
+              cleanRatio: 1
+              intervalThreshold: 2h0m0s
+    - name: hybrid
+      enable: false
+      config:
+        gcInitialDelay: 0s
+        gcInterval: 15s
+        driverConfigs:
+          disk:
+            gcConfig:
+              youngGCThreshold: 100.0GB
+              fullGCThreshold: 5.0GB
+              cleanRatio: 1
+              intervalThreshold: 2h0m0s
+          memory:
+            gcConfig:
+              youngGCThreshold: 100.0GB
+              fullGCThreshold: 5.0GB
+              cleanRatio: 3
+              intervalThreshold: 2h0m0s
+
+# console shows log on console
+console: false
+
+# whether to enable debug level logger and enable pprof
+verbose: false
+
+# listen port for pprof, only valid when the verbose option is true
+# default is -1. If it is 0, pprof will use a random port.
+pprof-port: -1
+
+# jaeger endpoint url, like: http://jaeger.dragonfly.svc:14268/api/traces
+jaeger: ""
+
+# service name used in tracer
+# default: dragonfly-cdn
+service-name: dragonfly-cdn
diff --git a/deploy/docker-compose/template/dfget.template.yaml b/deploy/docker-compose/template/dfget.template.yaml
index 2d1c763a..2a8a6da1 100644
--- a/deploy/docker-compose/template/dfget.template.yaml
+++ b/deploy/docker-compose/template/dfget.template.yaml
@@ -1,28 +1,70 @@
 # daemon alive time, when sets 0s, daemon will not auto exit
+# it is useful for longtime running
 aliveTime: 0s
 
 # daemon gc task running interval
 gcInterval: 1m0s
 
+# daemon work directory, daemon will change current working directory to this
+# in linux, default value is /usr/local/dragonfly
+# in macos(just for testing), default value is /Users/$USER/.dragonfly
+workHome: ""
+
+# cacheDir is dynconfig cache storage directory
+# in linux, default value is /var/cache/dragonfly
+# in macos(just for testing), default value is /Users/$USER/.dragonfly/cache
+cacheDir: ""
+
+# logDir is the log storage directory
+# in linux, default value is /var/log/dragonfly
+# in macos(just for testing), default value is /Users/$USER/.dragonfly/logs
+logDir: ""
+
+# dataDir is the download data storage directory
+# in linux, default value is /var/lib/dragonfly
+# in macos(just for testing), default value is /Users/$USER/.dragonfly/data
+dataDir: ""
+
 # when daemon exit, keep peer task data or not
 # it is usefully when upgrade daemon service, all local cache will be saved
+# default is false
 keepStorage: true
 
+# console shows log on console
+console: false
+
+# whether to enable debug level logger and enable pprof
+verbose: false
+
+# listen port for pprof, only valid when the verbose option is true
+# default is -1. If it is 0, pprof will use a random port.
+pprof-port: -1
+
+# jaeger endpoint url, like: http://jaeger.dragonfly.svc:14268/api/traces
+jaeger: ""
+
 # all addresses of all schedulers
 # the schedulers of all daemons should be same in one region or zone.
 # daemon will send tasks to a fixed scheduler by hashing the task url and meta data
 # caution: only tcp is supported
 scheduler:
+  manager:
+    # get scheduler list dynamically from manager
+    enable: false
+    # manager service addresses
+    netAddrs:
+      - type: tcp
+        addr: __IP__:65003
+        # scheduler list refresh interval
+        refreshInterval: 5m
+  # schedule timeout
+  scheduleTimeout: 30s
+  # when true, only scheduler says back source, daemon can back source
+  disableAutoBackSource: false
   # below example is a stand address
   netAddrs:
-  - type: tcp
-    addr: __IP__:8002
-  # schedule timeout
-  scheduleTimeout: 10s
-
-# when enable, pprof will be enabled,
-verbose: true
-console: false
+    - type: tcp
+      addr: __IP__:8002
 
 # current host info used for scheduler
 host:
@@ -32,17 +74,43 @@ host:
   # access ip for other peers
   # when local ip is different with access ip, advertiseIP should be set
   advertiseIP: __IP__
-  # geographical location and network topology
+  # geographical location, separated by "|" characters
   location: ""
+  # idc deployed by daemon
   idc: ""
+  # security domain deployed by daemon, network isolation between different security domains
   securityDomain: ""
+  # network topology, separated by "|" characters
   netTopology: ""
+  # daemon hostname
+  # hostname: ""
 
 # download service option
 download:
-  # download limit  per second
-  totalRateLimit: 1024Mi
-  perPeerRateLimit: 1024Mi
+  # calculate digest when transfer files, set false to save memory
+  calculateDigest: true
+  # total download limit per second
+  totalRateLimit: 200Mi
+  # per peer task download limit per second
+  perPeerRateLimit: 100Mi
+  # download piece timeout
+  pieceDownloadTimeout: 30s
+  # golang transport option
+  transportOption:
+    # dial timeout
+    dialTimeout: 2s
+    # keep alive
+    keepAlive: 30s
+    # same with http.Transport.MaxIdleConns
+    maxIdleConns: 100
+    # same with http.Transport.IdleConnTimeout
+    idleConnTimeout: 90s
+    # same with http.Transport.ResponseHeaderTimeout
+    responseHeaderTimeout: 2s
+    # same with http.Transport.TLSHandshakeTimeout
+    tlsHandshakeTimeout: 1s
+    # same with http.Transport.ExpectContinueTimeout
+    expectContinueTimeout: 2s
   # download grpc option
   downloadGRPC:
     # security option
@@ -55,6 +123,8 @@ download:
     # download service listen address
     # current, only support unix domain socket
     unixListen:
+      # in linux, default value is /var/run/dfdaemon.sock
+      # in macos(just for testing), default value is /tmp/dfdaemon.sock
       socket: /var/run/dfdaemon.sock
   # peer grpc option
   # peer grpc service send pieces info to other peers
@@ -75,14 +145,10 @@ download:
 #       start: 65000
 #       end: 65009
 
-# proxy config file location or detail config
-# proxy: ""
-
 # upload service option
 upload:
-  defaultFilter: "Expires&Signature"
   # upload limit per second
-  rateLimit: 200Mi
+  rateLimit: 100Mi
   security:
     insecure: true
     cacert: ""
@@ -103,19 +169,42 @@ upload:
 storage:
   # task data expire time
   # when there is no access to a task data, this task will be gc.
-  taskExpireTime: 1m0s
+  taskExpireTime: 6h
+  # storage strategy when process task data
+  # io.d7y.storage.v2.simple : download file to data directory first, then copy to output path, this is default action
+  #                           the download file in date directory will be the peer data for uploading to other peers
+  # io.d7y.storage.v2.advance: download file directly to output path with postfix, hard link to final output,
+  #                            avoid copy to output path, fast than simple strategy, but:
+  #                            the output file with postfix will be the peer data for uploading to other peers
+  #                            when user delete or change this file, this peer data will be corrupted
+  # default is io.d7y.storage.v2.advance
+  strategy: io.d7y.storage.v2.advance
+  # disk quota gc threshold, when the quota of all tasks exceeds the gc threshold, the oldest tasks will be reclaimed.
+  diskGCThreshold: 50Gi
+  # disk used percent gc threshold, when the disk used percent exceeds, the oldest tasks will be reclaimed.
+  # eg, diskGCThresholdPercent=80, when the disk usage is above 80%, start to gc the oldest tasks
+  diskGCThresholdPercent: 80
+  # set to ture for reusing underlying storage for same task id
   multiplex: true
 
-# proxy service option
+# proxy service config file location or detail config
+# proxy: ""
+
+# proxy service detail option
 proxy:
+  # filter for hash url
+  # when defaultFilter: "Expires&Signature", for example:
+  #  http://localhost/xyz?Expires=111&Signature=222 and http://localhost/xyz?Expires=333&Signature=999
+  # is same task
+  defaultFilter: "Expires&Signature"
   security:
     insecure: true
     cacert: ""
     cert: ""
     key: ""
   tcpListen:
-    # Namespace stands the linux net namespace, like /proc/1/ns/net
-    # It's useful for running daemon in pod with ip allocated and listen in host
+    # namespace stands the linux net namespace, like /proc/1/ns/net
+    # it's useful for running daemon in pod with ip allocated and listening the special port in host net namespace
     # Linux only
     namespace: ""
     # listen address
@@ -128,16 +217,51 @@ proxy:
   #     start: 65020
   #     end: 65029
   registryMirror:
+    # when enable, using header "X-Dragonfly-Registry" for remote instead of url
+    dynamic: true
     # url for the registry mirror
     url: https://index.docker.io
     # whether to ignore https certificate errors
     insecure: true
     # optional certificates if the remote server uses self-signed certificates
-    certs: [ ]
+    certs: []
     # whether to request the remote registry directly
     direct: false
+    # whether to use proxies to decide if dragonfly should be used
+    useProxies: false
 
   proxies:
-  # proxy all http image layer download requests with dfget
-  - regx: (blobs|manifests|config)/sha256.*
-  - regx: __IP__.* # test only
+    # proxy all http image layer download requests with dfget
+    - regx: blobs/sha256.*
+    # change http requests to some-registry to https and proxy them with dfget
+    - regx: some-registry/
+      useHTTPS: true
+    # proxy requests directly, without dfget
+    - regx: no-proxy-reg
+      direct: true
+    # proxy requests with redirect
+    - regx: some-registry
+      redirect: another-registry
+    # the same with url rewrite like apache ProxyPass directive
+    - regx: ^http://some-registry/(.*)
+      redirect: http://another-registry/$1
+
+  hijackHTTPS:
+    # key pair used to hijack https requests
+    cert: ""
+    key: ""
+    hosts:
+      - regx: mirror.aliyuncs.com:443 # regexp to match request hosts
+        # whether to ignore https certificate errors
+        insecure: true
+        # optional certificates if the host uses self-signed certificates
+        certs: []
+  # max tasks to download same time, 0 is no limit
+  maxConcurrency: 0
+  whiteList:
+    # the host of the whitelist
+    - host: ""
+      # match whitelist hosts
+      regx:
+      # port that need to be added to the whitelist
+      ports:
\ No newline at end of file
diff --git a/deploy/docker-compose/template/manager.template.yaml b/deploy/docker-compose/template/manager.template.yaml
new file mode 100644
index 00000000..5bbf6b92
--- /dev/null
+++ b/deploy/docker-compose/template/manager.template.yaml
@@ -0,0 +1,73 @@
+# current server info used for server
+server:
+  # grpc server configure
+  grpc:
+    # listen address
+    listen: __IP__
+    # listen port, manager will try to listen
+    # when this port is not available, manager will try next port
+    port:
+      start: 65003
+      end: 65003
+  # rest server configure
+  rest:
+    # stand address
+    addr: :8080
+  # front-end console resource path
+  # publicPath: /dist
+
+# database info used for server
+database:
+  # mysql configure
+  mysql:
+    user: dragonfly
+    password: dragonfly
+    host: __IP__
+    port: 3306
+    dbname: manager
+    migrate: true
+  # tls:
+  #   # client certificate file path
+  #   cert: /etc/ssl/certs/cert.pem
+  #   # client key file path
+  #   key: /etc/ssl/private/key.pem
+  #   # ca file path
+  #   ca: /etc/ssl/certs/ca.pem
+  #   # whether a client verifies the server's certificate chain and host name.
+  #   insecureSkipVerify: true
+  # redis configure
+  redis:
+    password: dragonfly
+    host: __IP__
+    port: 6379
+    db: 0
+# manager server cache
+# cache:
+#   # redis cache configure
+#   redis:
+#     # cache ttl configure
+#     ttl: 30s
+#   # local cache configure
+#   local:
+#     # lfu cache size
+#     size: 10000
+#     # cache ttl configure
+#     ttl: 30s
+
+# enable prometheus metrics
+# metrics:
+#  # metrics service address
+#  addr: ":8000"
+
+# console shows log on console
+console: false
+
+# whether to enable debug level logger and enable pprof
+verbose: false
+
+# listen port for pprof, only valid when the verbose option is true
+# default is -1. If it is 0, pprof will use a random port.
+pprof-port: -1
+
+# jaeger endpoint url, like: http://jaeger.dragonfly.svc:14268/api/traces
+jaeger: ""
\ No newline at end of file
diff --git a/deploy/docker-compose/template/scheduler.template.yaml b/deploy/docker-compose/template/scheduler.template.yaml
new file mode 100644
index 00000000..c91fed70
--- /dev/null
+++ b/deploy/docker-compose/template/scheduler.template.yaml
@@ -0,0 +1,130 @@
+# server scheduler instance configuration
+server:
+  # # ip
+  ip: 0.0.0.0
+  # # host
+  # host: localhost
+  # port is the ip and port scheduler server listens on.
+  port: 8002
+  # limit the number of requests
+  listenLimit: 10000
+  # cacheDir is dynconfig cache storage directory
+  # in linux, default value is /var/cache/dragonfly
+  # in macos(just for testing), default value is /Users/$USER/.dragonfly/cache
+  cacheDir: ""
+  # logDir is the log storage directory
+  # in linux, default value is /var/log/dragonfly
+  # in macos(just for testing), default value is /Users/$USER/.dragonfly/logs
+  logDir: ""
+
+# scheduler policy configuration
+scheduler:
+  # algorithm configuration to use different scheduling algorithms,
+  # default configuration supports "default" and "ml"
+  # "default" is the rule-based scheduling algorithm,
+  # "ml" is the machine learning scheduling algorithm
+  # It also supports user plugin extension, the algorithm value is "plugin",
+  # and the compiled `d7y-scheduler-plugin-evaluator.so` file is added to
+  # the dragonfly working directory plugins
+  algorithm: default
+  # backSourceCount is the number of backsource clients
+  # when the CDN is unavailable
+  backSourceCount: 3
+  # retry scheduling back-to-source limit times
+  retryBackSourceLimit: 5
+  # retry scheduling limit times
+  retryLimit: 20
+  # retry scheduling interval
+  retryInterval: 200ms
+  # gc metadata configuration
+  gc:
+    # peerGCInterval is peer's gc interval
+    peerGCInterval: 10m
+    # peerTTL is peer's TTL duration
+    peerTTL: 24h
+    # taskGCInterval is task's gc interval
+    taskGCInterval: 10m
+    # taskTTL is task's TTL duration
+    taskTTL: 24h
+    # hostGCInterval is host's gc interval
+    hostGCInterval: 30m
+    # hostTTL is host's TTL duration
+    hostTTL: 48h
+
+# dynamic data configuration
+dynConfig:
+  # dynamic config refresh interval
+  refreshInterval: 1m
+
+# scheduler host configuration
+host:
+  # idc is the idc of scheduler instance
+  idc: ""
+  # netTopology is the net topology of scheduler instance
+  netTopology: ""
+  # location is the location of scheduler instance
+  location: ""
+
+# manager configuration
+manager:
+  # addr manager access address
+  addr: "__IP__:65003"
+  # schedulerClusterID cluster id to which scheduler instance belongs
+  schedulerClusterID: "1"
+  # keepAlive keep alive configuration
+  keepAlive:
+    # interval
+    interval: 5s
+
+# cdn configuration
+cdn:
+  # scheduler enable cdn as P2P peer,
+  # if the value is false, P2P network will not be back-to-source through
+  # cdn but by dfdaemon and preheat feature does not work
+  enable: true
+
+# machinery async job configuration,
+# see https://github.com/RichardKnop/machinery
+job:
+  # scheduler enable job service
+  enable: false
+  # number of workers in global queue
+  globalWorkerNum: 1
+  # number of workers in scheduler queue
+  schedulerWorkerNum: 1
+  # number of workers in local queue
+  localWorkerNum: 5
+  # redis configuration
+  redis:
+    # host
+    host: "__IP__"
+    # port
+    port: 6379
+    # password
+    password: ""
+    # brokerDB
+    brokerDB: 1
+    # backendDB
+    backendDB: 2
+
+# enable prometheus metrics
+metrics:
+  # scheduler enable metrics service
+  enable: false
+  # metrics service address
+  addr: ":8000"
+  # enable peer host metrics
+  enablePeerHost: false
+
+# console shows log on console
+console: true
+
+# whether to enable debug level logger and enable pprof
+verbose: true
+
+# listen port for pprof, only valid when the verbose option is true
+# default is -1. If it is 0, pprof will use a random port.
+pprof-port: -1
+
+# jaeger endpoint url, like: http://jaeger.dragonfly.svc:14268/api/traces
+jaeger: ""
\ No newline at end of file
diff --git a/hack/update-version-gorelease.sh b/hack/update-version-gorelease.sh
new file mode 100755
index 00000000..2ba5214a
--- /dev/null
+++ b/hack/update-version-gorelease.sh
@@ -0,0 +1,5 @@
+#!/bin/sh
+
+GO_VERSION=$(go version | grep -o 'go[^ ].*')
+
+sed -i "s#\tGoVersion  = ".*"#\tGoVersion  = \"${GO_VERSION}\"#" version/version.go
\ No newline at end of file
diff --git a/manager/types/scheduler_cluster.go b/manager/types/scheduler_cluster.go
index 63069abd..1bc93610 100644
--- a/manager/types/scheduler_cluster.go
+++ b/manager/types/scheduler_cluster.go
@@ -55,7 +55,8 @@ type SchedulerClusterConfig struct {
 }
 
 type SchedulerClusterClientConfig struct {
-	LoadLimit uint32 `yaml:"loadLimit" mapstructure:"loadLimit" json:"load_limit" binding:"omitempty,gte=1,lte=5000"`
+	LoadLimit     uint32 `yaml:"loadLimit" mapstructure:"loadLimit" json:"load_limit" binding:"omitempty,gte=1,lte=5000"`
+	ParallelCount uint32 `yaml:"parallelCount" mapstructure:"parallelCount" json:"parallel_count" binding:"omitempty,gte=1,lte=50"`
 }
 
 type SchedulerClusterScopes struct {
diff --git a/pkg/rpc/dfdaemon/dfdaemon.pb.go b/pkg/rpc/dfdaemon/dfdaemon.pb.go
index 567f8479..d43ea337 100644
--- a/pkg/rpc/dfdaemon/dfdaemon.pb.go
+++ b/pkg/rpc/dfdaemon/dfdaemon.pb.go
@@ -16,7 +16,7 @@
 // Code generated by protoc-gen-go. DO NOT EDIT.
 // versions:
 // 	protoc-gen-go v1.27.1
-// 	protoc        v3.17.3
+// 	protoc        v3.19.1
 // source: pkg/rpc/dfdaemon/dfdaemon.proto
 
 package dfdaemon
@@ -64,6 +64,8 @@ type DownRequest struct {
 	Uid int64 `protobuf:"varint,10,opt,name=uid,proto3" json:"uid,omitempty"`
 	// group id
 	Gid int64 `protobuf:"varint,11,opt,name=gid,proto3" json:"gid,omitempty"`
+	// keep original offset, used for ranged request, only available for hard link, otherwise will failed
+	KeepOriginalOffset bool `protobuf:"varint,12,opt,name=keep_original_offset,json=keepOriginalOffset,proto3" json:"keep_original_offset,omitempty"`
 }
 
 func (x *DownRequest) Reset() {
@@ -175,6 +177,13 @@ func (x *DownRequest) GetGid() int64 {
 	return 0
 }
 
+func (x *DownRequest) GetKeepOriginalOffset() bool {
+	if x != nil {
+		return x.KeepOriginalOffset
+	}
+	return false
+}
+
 type DownResult struct {
 	state         protoimpl.MessageState
 	sizeCache     protoimpl.SizeCache
@@ -256,7 +265,7 @@ var file_pkg_rpc_dfdaemon_dfdaemon_proto_rawDesc = []byte{
 	0x72, 0x6f, 0x74, 0x6f, 0x1a, 0x1b, 0x67, 0x6f, 0x6f, 0x67, 0x6c, 0x65, 0x2f, 0x70, 0x72, 0x6f,
 	0x74, 0x6f, 0x62, 0x75, 0x66, 0x2f, 0x65, 0x6d, 0x70, 0x74, 0x79, 0x2e, 0x70, 0x72, 0x6f, 0x74,
 	0x6f, 0x1a, 0x17, 0x76, 0x61, 0x6c, 0x69, 0x64, 0x61, 0x74, 0x65, 0x2f, 0x76, 0x61, 0x6c, 0x69,
-	0x64, 0x61, 0x74, 0x65, 0x2e, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x22, 0x85, 0x03, 0x0a, 0x0b, 0x44,
+	0x64, 0x61, 0x74, 0x65, 0x2e, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x22, 0xb7, 0x03, 0x0a, 0x0b, 0x44,
 	0x6f, 0x77, 0x6e, 0x52, 0x65, 0x71, 0x75, 0x65, 0x73, 0x74, 0x12, 0x1c, 0x0a, 0x04, 0x75, 0x75,
 	0x69, 0x64, 0x18, 0x01, 0x20, 0x01, 0x28, 0x09, 0x42, 0x08, 0xfa, 0x42, 0x05, 0x72, 0x03, 0xb0,
 	0x01, 0x01, 0x52, 0x04, 0x75, 0x75, 0x69, 0x64, 0x12, 0x1a, 0x0a, 0x03, 0x75, 0x72, 0x6c, 0x18,
@@ -281,31 +290,34 @@ var file_pkg_rpc_dfdaemon_dfdaemon_proto_rawDesc = []byte{
 	0x28, 0x09, 0x52, 0x0a, 0x63, 0x61, 0x6c, 0x6c, 0x73, 0x79, 0x73, 0x74, 0x65, 0x6d, 0x12, 0x10,
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+	0x12, 0x16, 0x2e, 0x67, 0x6f, 0x6f, 0x67, 0x6c, 0x65, 0x2e, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x62,
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+	0x65, 0x2e, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x62, 0x75, 0x66, 0x2e, 0x45, 0x6d, 0x70, 0x74, 0x79,
+	0x42, 0x26, 0x5a, 0x24, 0x64, 0x37, 0x79, 0x2e, 0x69, 0x6f, 0x2f, 0x64, 0x72, 0x61, 0x67, 0x6f,
+	0x6e, 0x66, 0x6c, 0x79, 0x2f, 0x76, 0x32, 0x2f, 0x70, 0x6b, 0x67, 0x2f, 0x72, 0x70, 0x63, 0x2f,
+	0x64, 0x66, 0x64, 0x61, 0x65, 0x6d, 0x6f, 0x6e, 0x62, 0x06, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x33,
 }
 
 var (
diff --git a/pkg/rpc/dfdaemon/dfdaemon.pb.validate.go b/pkg/rpc/dfdaemon/dfdaemon.pb.validate.go
index e28b804a..844285bb 100644
--- a/pkg/rpc/dfdaemon/dfdaemon.pb.validate.go
+++ b/pkg/rpc/dfdaemon/dfdaemon.pb.validate.go
@@ -115,6 +115,8 @@ func (m *DownRequest) Validate() error {
 
 	// no validation rules for Gid
 
+	// no validation rules for KeepOriginalOffset
+
 	return nil
 }
 
diff --git a/pkg/rpc/dfdaemon/dfdaemon.proto b/pkg/rpc/dfdaemon/dfdaemon.proto
index bc7b37cf..4c68a0da 100644
--- a/pkg/rpc/dfdaemon/dfdaemon.proto
+++ b/pkg/rpc/dfdaemon/dfdaemon.proto
@@ -46,6 +46,8 @@ message DownRequest{
   int64 uid = 10;
   // group id
   int64 gid = 11;
+  // keep original offset, used for ranged request, only available for hard link, otherwise will failed
+  bool keep_original_offset = 12;
 }
 
 message DownResult{
diff --git a/pkg/rpc/dfdaemon/dfdaemon_grpc.pb.go b/pkg/rpc/dfdaemon/dfdaemon_grpc.pb.go
index 3307b9b3..439a0b7d 100644
--- a/pkg/rpc/dfdaemon/dfdaemon_grpc.pb.go
+++ b/pkg/rpc/dfdaemon/dfdaemon_grpc.pb.go
@@ -1,4 +1,8 @@
 // Code generated by protoc-gen-go-grpc. DO NOT EDIT.
+// versions:
+// - protoc-gen-go-grpc v1.2.0
+// - protoc             v3.19.1
+// source: pkg/rpc/dfdaemon/dfdaemon.proto
 
 package dfdaemon
 
diff --git a/pkg/source/httpprotocol/http_source_client.go b/pkg/source/httpprotocol/http_source_client.go
index cfd383be..51d380a8 100644
--- a/pkg/source/httpprotocol/http_source_client.go
+++ b/pkg/source/httpprotocol/http_source_client.go
@@ -179,6 +179,7 @@ func (client *httpSourceClient) Download(request *source.Request) (*source.Respo
 		resp.Body.Close()
 		return nil, err
 	}
+	// FIXME check response "Content-Range" header, if not found, need to wrap resp.Body
 	response := source.NewResponse(
 		resp.Body,
 		source.WithExpireInfo(
diff --git a/scheduler/resource/peer.go b/scheduler/resource/peer.go
index a75440f8..3b566e94 100644
--- a/scheduler/resource/peer.go
+++ b/scheduler/resource/peer.go
@@ -199,6 +199,7 @@ func NewPeer(id string, task *Task, host *Host) *Peer {
 					p.Task.BackToSourcePeers.Delete(p)
 				}
 
+				p.DeleteParent()
 				p.UpdateAt.Store(time.Now())
 				p.Log.Infof("peer state is %s", e.FSM.Current())
 			},
diff --git a/scheduler/scheduler.go b/scheduler/scheduler.go
index a7cfad5a..491a777f 100644
--- a/scheduler/scheduler.go
+++ b/scheduler/scheduler.go
@@ -92,11 +92,11 @@ func New(ctx context.Context, cfg *config.Config, d dfpath.Dfpath) (*Server, err
 	}
 
 	// Initialize dynconfig client
-	dynConfig, err := config.NewDynconfig(s.managerClient, d.CacheDir(), cfg)
+	dynconfig, err := config.NewDynconfig(s.managerClient, d.CacheDir(), cfg)
 	if err != nil {
 		return nil, err
 	}
-	s.dynconfig = dynConfig
+	s.dynconfig = dynconfig
 
 	// Initialize GC
 	s.gc = gc.New(gc.WithLogger(logger.GCLogger))
@@ -122,16 +122,16 @@ func New(ctx context.Context, cfg *config.Config, d dfpath.Dfpath) (*Server, err
 	}
 
 	// Initialize resource
-	resource, err := resource.New(cfg, s.gc, dynConfig, dialOptions...)
+	resource, err := resource.New(cfg, s.gc, dynconfig, dialOptions...)
 	if err != nil {
 		return nil, err
 	}
 
 	// Initialize scheduler
-	scheduler := scheduler.New(cfg.Scheduler, d.PluginDir())
+	scheduler := scheduler.New(cfg.Scheduler, dynconfig, d.PluginDir())
 
 	// Initialize scheduler service
-	service := service.New(cfg, resource, scheduler, dynConfig)
+	service := service.New(cfg, resource, scheduler, dynconfig)
 
 	// Initialize grpc service
 	svr := rpcserver.New(service, serverOptions...)
diff --git a/scheduler/scheduler/scheduler.go b/scheduler/scheduler/scheduler.go
index 31abb1f3..9d553acc 100644
--- a/scheduler/scheduler/scheduler.go
+++ b/scheduler/scheduler/scheduler.go
@@ -31,6 +31,11 @@ import (
 	"d7y.io/dragonfly/v2/scheduler/scheduler/evaluator"
 )
 
+const (
+	// Default number of pieces downloaded in parallel
+	defaultParallelCount = 4
+)
+
 type Scheduler interface {
 	// ScheduleParent schedule a parent and candidates to a peer
 	ScheduleParent(context.Context, *resource.Peer, set.SafeSet)
@@ -48,12 +53,16 @@ type scheduler struct {
 
 	// Scheduler configuration
 	config *config.SchedulerConfig
+
+	// Scheduler dynamic configuration
+	dynconfig config.DynconfigInterface
 }
 
-func New(cfg *config.SchedulerConfig, pluginDir string) Scheduler {
+func New(cfg *config.SchedulerConfig, dynconfig config.DynconfigInterface, pluginDir string) Scheduler {
 	return &scheduler{
 		evaluator: evaluator.New(cfg.Algorithm, pluginDir),
 		config:    cfg,
+		dynconfig: dynconfig,
 	}
 }
 
@@ -172,7 +181,7 @@ func (s *scheduler) NotifyAndFindParent(ctx context.Context, peer *resource.Peer
 		return []*resource.Peer{}, false
 	}
 
-	if err := stream.Send(constructSuccessPeerPacket(peer, parents[0], parents[1:])); err != nil {
+	if err := stream.Send(constructSuccessPeerPacket(s.dynconfig, peer, parents[0], parents[1:])); err != nil {
 		peer.Log.Error(err)
 		return []*resource.Peer{}, false
 	}
@@ -254,7 +263,12 @@ func (s *scheduler) filterParents(peer *resource.Peer, blocklist set.SafeSet) []
 }
 
 // Construct peer successful packet
-func constructSuccessPeerPacket(peer *resource.Peer, parent *resource.Peer, candidateParents []*resource.Peer) *rpcscheduler.PeerPacket {
+func constructSuccessPeerPacket(dynconfig config.DynconfigInterface, peer *resource.Peer, parent *resource.Peer, candidateParents []*resource.Peer) *rpcscheduler.PeerPacket {
+	parallelCount := defaultParallelCount
+	if client, ok := dynconfig.GetSchedulerClusterClientConfig(); ok && client.ParallelCount > 0 {
+		parallelCount = int(client.ParallelCount)
+	}
+
 	var stealPeers []*rpcscheduler.PeerPacket_DestPeer
 	for _, candidateParent := range candidateParents {
 		stealPeers = append(stealPeers, &rpcscheduler.PeerPacket_DestPeer{
@@ -265,10 +279,9 @@ func constructSuccessPeerPacket(peer *resource.Peer, parent *resource.Peer, cand
 	}
 
 	return &rpcscheduler.PeerPacket{
-		TaskId: peer.Task.ID,
-		SrcPid: peer.ID,
-		// TODO(gaius-qi) Configure ParallelCount parameter in manager service
-		ParallelCount: 1,
+		TaskId:        peer.Task.ID,
+		SrcPid:        peer.ID,
+		ParallelCount: int32(parallelCount),
 		MainPeer: &rpcscheduler.PeerPacket_DestPeer{
 			Ip:      parent.Host.IP,
 			RpcPort: parent.Host.Port,



Test patch:
diff --git a/client/daemon/peer/peertask_manager_test.go b/client/daemon/peer/peertask_manager_test.go
index 9a77be2d..7cb8892f 100644
--- a/client/daemon/peer/peertask_manager_test.go
+++ b/client/daemon/peer/peertask_manager_test.go
@@ -651,7 +651,8 @@ func (ts *testSpec) runConductorTest(assert *testifyassert.Assertions, require *
 		PeerHost: &scheduler.PeerHost{},
 	}
 
-	ptc, created, err := ptm.getOrCreatePeerTaskConductor(context.Background(), taskID, peerTaskRequest, rate.Limit(pieceSize*4))
+	ptc, created, err := ptm.getOrCreatePeerTaskConductor(
+		context.Background(), taskID, peerTaskRequest, rate.Limit(pieceSize*4), nil, nil, "")
 	assert.Nil(err, "load first peerTaskConductor")
 	assert.True(created, "should create a new peerTaskConductor")
 
@@ -695,7 +696,8 @@ func (ts *testSpec) runConductorTest(assert *testifyassert.Assertions, require *
 			PeerId:   fmt.Sprintf("should-not-use-peer-%d", i),
 			PeerHost: &scheduler.PeerHost{},
 		}
-		p, created, err := ptm.getOrCreatePeerTaskConductor(context.Background(), taskID, request, rate.Limit(pieceSize*3))
+		p, created, err := ptm.getOrCreatePeerTaskConductor(
+			context.Background(), taskID, request, rate.Limit(pieceSize*3), nil, nil, "")
 		assert.Nil(err, fmt.Sprintf("load peerTaskConductor %d", i))
 		assert.Equal(ptc.peerID, p.GetPeerID(), fmt.Sprintf("ptc %d should be same with ptc", i))
 		assert.False(created, "should not create a new peerTaskConductor")
diff --git a/client/daemon/peer/peertask_stream_backsource_partial_test.go b/client/daemon/peer/peertask_stream_backsource_partial_test.go
index 351916c3..dfc38be0 100644
--- a/client/daemon/peer/peertask_stream_backsource_partial_test.go
+++ b/client/daemon/peer/peertask_stream_backsource_partial_test.go
@@ -265,7 +265,7 @@ func TestStreamPeerTask_BackSource_Partial_WithContentLength(t *testing.T) {
 		PeerHost: &scheduler.PeerHost{},
 	}
 	ctx := context.Background()
-	pt, err := ptm.newStreamTask(ctx, req)
+	pt, err := ptm.newStreamTask(ctx, req, nil)
 	assert.Nil(err, "new stream peer task")
 
 	rc, _, err := pt.Start(ctx)
diff --git a/client/daemon/peer/piece_manager_test.go b/client/daemon/peer/piece_manager_test.go
index b69df49c..6e351dc3 100644
--- a/client/daemon/peer/piece_manager_test.go
+++ b/client/daemon/peer/piece_manager_test.go
@@ -174,13 +174,13 @@ func TestPieceManager_DownloadSource(t *testing.T) {
 				return logger.With("test case", tc.name)
 			})
 			taskStorage, err = storageManager.RegisterTask(context.Background(),
-				storage.RegisterTaskRequest{
-					CommonTaskRequest: storage.CommonTaskRequest{
-						PeerID:      mockPeerTask.GetPeerID(),
-						TaskID:      mockPeerTask.GetTaskID(),
-						Destination: output,
+				&storage.RegisterTaskRequest{
+					PeerTaskMetadata: storage.PeerTaskMetadata{
+						PeerID: mockPeerTask.GetPeerID(),
+						TaskID: mockPeerTask.GetTaskID(),
 					},
-					ContentLength: int64(len(testBytes)),
+					DesiredLocation: output,
+					ContentLength:   int64(len(testBytes)),
 				})
 			assert.Nil(err)
 			defer storageManager.CleanUp()
diff --git a/client/daemon/storage/local_storage_test.go b/client/daemon/storage/local_storage_test.go
index 5cad30b5..0e46c129 100644
--- a/client/daemon/storage/local_storage_test.go
+++ b/client/daemon/storage/local_storage_test.go
@@ -25,7 +25,6 @@ import (
 	"math/rand"
 	"os"
 	"path"
-	"path/filepath"
 	"testing"
 	"time"
 
@@ -37,136 +36,286 @@ import (
 	logger "d7y.io/dragonfly/v2/internal/dflog"
 	"d7y.io/dragonfly/v2/pkg/rpc/base"
 	_ "d7y.io/dragonfly/v2/pkg/rpc/dfdaemon/server"
+	"d7y.io/dragonfly/v2/pkg/util/digestutils"
 )
 
 func TestMain(m *testing.M) {
 	os.Exit(m.Run())
 }
 
-func TestLocalTaskStore_PutAndGetPiece_Simple(t *testing.T) {
+func TestLocalTaskStore_PutAndGetPiece(t *testing.T) {
 	assert := testifyassert.New(t)
 	testBytes, err := os.ReadFile(test.File)
 	assert.Nil(err, "load test file")
+	md5Test, _ := calcFileMd5(test.File, nil)
 
 	dst := path.Join(test.DataDir, taskData+".copy")
 	defer os.Remove(dst)
 
-	var (
-		taskID    = "task-d4bb1c273a9889fea14abd4651994fe8"
-		peerID    = "peer-d4bb1c273a9889fea14abd4651994fe8"
-		pieceSize = 512
-	)
-	sm, err := NewStorageManager(config.SimpleLocalTaskStoreStrategy,
-		&config.StorageOption{
-			DataPath: test.DataDir,
-			TaskExpireTime: clientutil.Duration{
-				Duration: time.Minute,
+	testCases := []struct {
+		name     string
+		strategy config.StoreStrategy
+		create   func(s *storageManager, taskID, peerID string) (TaskStorageDriver, error)
+	}{
+		{
+			name:     "normal",
+			strategy: config.SimpleLocalTaskStoreStrategy,
+			create: func(s *storageManager, taskID, peerID string) (TaskStorageDriver, error) {
+				return s.CreateTask(
+					&RegisterTaskRequest{
+						PeerTaskMetadata: PeerTaskMetadata{
+							PeerID: peerID,
+							TaskID: taskID,
+						},
+						DesiredLocation: dst,
+						ContentLength:   int64(len(testBytes)),
+					})
 			},
-		}, func(request CommonTaskRequest) {
-		})
-	if err != nil {
-		t.Fatal(err)
-	}
-
-	var s = sm.(*storageManager)
-
-	_, err = s.CreateTask(
-		RegisterTaskRequest{
-			CommonTaskRequest: CommonTaskRequest{
-				PeerID:      peerID,
-				TaskID:      taskID,
-				Destination: dst,
-			},
-			ContentLength: int64(len(testBytes)),
-		})
-	assert.Nil(err, "create task storage")
-	ts, ok := s.LoadTask(PeerTaskMetadata{
-		PeerID: peerID,
-		TaskID: taskID,
-	})
-	assert.True(ok, "")
-
-	var pieces []struct {
-		index int
-		start int
-		end   int // not contain in data
-	}
-	for i := 0; i*pieceSize < len(testBytes); i++ {
-		start := i * pieceSize
-		end := start + pieceSize
-		if end > len(testBytes) {
-			end = len(testBytes)
-		}
-		pieces = append(pieces, struct {
-			index int
-			start int
-			end   int
-		}{
-			index: i,
-			start: start,
-			end:   end,
-		})
-	}
-	rand.Seed(time.Now().UnixNano())
-	rand.Shuffle(len(pieces), func(i, j int) { pieces[i], pieces[j] = pieces[j], pieces[i] })
-
-	// random put all pieces
-	for _, p := range pieces {
-		_, err = ts.WritePiece(context.Background(), &WritePieceRequest{
-			PeerTaskMetadata: PeerTaskMetadata{
-				TaskID: taskID,
+		},
+		{
+			name:     "normal",
+			strategy: config.AdvanceLocalTaskStoreStrategy,
+			create: func(s *storageManager, taskID, peerID string) (TaskStorageDriver, error) {
+				return s.CreateTask(
+					&RegisterTaskRequest{
+						PeerTaskMetadata: PeerTaskMetadata{
+							PeerID: peerID,
+							TaskID: taskID,
+						},
+						DesiredLocation: dst,
+						ContentLength:   int64(len(testBytes)),
+					})
 			},
-			PieceMetadata: PieceMetadata{
-				Num:    int32(p.index),
-				Md5:    "",
-				Offset: uint64(p.start),
-				Range: clientutil.Range{
-					Start:  int64(p.start),
-					Length: int64(p.end - p.start),
-				},
-				Style: base.PieceStyle_PLAIN,
+		},
+		{
+			name:     "subtask",
+			strategy: config.AdvanceLocalTaskStoreStrategy,
+			create: func(s *storageManager, taskID, peerID string) (TaskStorageDriver, error) {
+				var (
+					parentPeerID = peerID + "-parent"
+					parentTaskID = taskID + "-parent"
+				)
+
+				_, err := s.CreateTask(
+					&RegisterTaskRequest{
+						PeerTaskMetadata: PeerTaskMetadata{
+							PeerID: parentPeerID,
+							TaskID: parentTaskID,
+						},
+						DesiredLocation: dst,
+						ContentLength:   int64(len(testBytes)),
+					})
+				assert.Nil(err)
+
+				return s.RegisterSubTask(
+					context.Background(),
+					&RegisterSubTaskRequest{
+						Parent: PeerTaskMetadata{
+							PeerID: parentPeerID,
+							TaskID: parentTaskID,
+						},
+						SubTask: PeerTaskMetadata{
+							PeerID: peerID,
+							TaskID: taskID,
+						},
+						Range: &clientutil.Range{
+							Start:  100,
+							Length: int64(len(testBytes)),
+						},
+					})
 			},
-			Reader: bytes.NewBuffer(testBytes[p.start:p.end]),
-		})
-		assert.Nil(err, "put piece")
+		},
 	}
 
-	md5Test, _ := calcFileMd5(test.File)
-	md5TaskData, _ := calcFileMd5(path.Join(ts.(*localTaskStore).dataDir, taskData))
-	assert.Equal(md5Test, md5TaskData, "md5 must match")
-
-	// shuffle again for get all pieces
-	rand.Shuffle(len(pieces), func(i, j int) { pieces[i], pieces[j] = pieces[j], pieces[i] })
-	for _, p := range pieces {
-		rd, cl, err := ts.ReadPiece(context.Background(), &ReadPieceRequest{
-			PeerTaskMetadata: PeerTaskMetadata{
+	for _, tc := range testCases {
+		t.Run(tc.name+"-"+string(tc.strategy), func(t *testing.T) {
+			var (
+				taskID    = "task-d4bb1c273a9889fea14abd4651994fe8"
+				peerID    = "peer-d4bb1c273a9889fea14abd4651994fe8"
+				pieceSize = 512
+			)
+			sm, err := NewStorageManager(config.SimpleLocalTaskStoreStrategy,
+				&config.StorageOption{
+					DataPath: test.DataDir,
+					TaskExpireTime: clientutil.Duration{
+						Duration: time.Minute,
+					},
+				}, func(request CommonTaskRequest) {
+				})
+			assert.Nil(err)
+
+			_, err = tc.create(sm.(*storageManager), taskID, peerID)
+			assert.Nil(err, "create task storage")
+
+			ts, ok := sm.(*storageManager).LoadTask(PeerTaskMetadata{
+				PeerID: peerID,
 				TaskID: taskID,
-			},
-			PieceMetadata: PieceMetadata{
-				Num:    int32(p.index),
-				Md5:    "",
-				Offset: uint64(p.start),
-				Range: clientutil.Range{
-					Start:  int64(p.start),
-					Length: int64(p.end - p.start),
+			})
+			assert.True(ok, "load created task")
+
+			var pieces []struct {
+				index int
+				start int
+				end   int // not contain in data
+			}
+			var piecesMd5 []string
+			for i := 0; i*pieceSize < len(testBytes); i++ {
+				start := i * pieceSize
+				end := start + pieceSize
+				if end > len(testBytes) {
+					end = len(testBytes)
+				}
+				pieces = append(pieces, struct {
+					index int
+					start int
+					end   int
+				}{
+					index: i,
+					start: start,
+					end:   end,
+				})
+				piecesMd5 = append(piecesMd5, calcPieceMd5(testBytes[start:end]))
+			}
+			rand.Seed(time.Now().UnixNano())
+			rand.Shuffle(len(pieces), func(i, j int) { pieces[i], pieces[j] = pieces[j], pieces[i] })
+
+			// random put all pieces
+			for _, p := range pieces {
+				_, err = ts.WritePiece(context.Background(), &WritePieceRequest{
+					PeerTaskMetadata: PeerTaskMetadata{
+						TaskID: taskID,
+					},
+					PieceMetadata: PieceMetadata{
+						Num:    int32(p.index),
+						Md5:    piecesMd5[p.index],
+						Offset: uint64(p.start),
+						Range: clientutil.Range{
+							Start:  int64(p.start),
+							Length: int64(p.end - p.start),
+						},
+						Style: base.PieceStyle_PLAIN,
+					},
+					Reader: bytes.NewBuffer(testBytes[p.start:p.end]),
+				})
+				assert.Nil(err, "put piece")
+			}
+
+			if lts, ok := ts.(*localTaskStore); ok {
+				md5TaskData, _ := calcFileMd5(path.Join(lts.dataDir, taskData), nil)
+				assert.Equal(md5Test, md5TaskData, "md5 must match")
+			} else if lsts, ok := ts.(*localSubTaskStore); ok {
+				md5TaskData, _ := calcFileMd5(path.Join(lsts.parent.dataDir, taskData), lsts.Range)
+				assert.Equal(md5Test, md5TaskData, "md5 must match")
+			}
+
+			// shuffle again for get all pieces
+			rand.Shuffle(len(pieces), func(i, j int) { pieces[i], pieces[j] = pieces[j], pieces[i] })
+			for _, p := range pieces {
+				rd, cl, err := ts.ReadPiece(context.Background(), &ReadPieceRequest{
+					PeerTaskMetadata: PeerTaskMetadata{
+						TaskID: taskID,
+					},
+					PieceMetadata: PieceMetadata{
+						Num:    int32(p.index),
+						Md5:    piecesMd5[p.index],
+						Offset: uint64(p.start),
+						Range: clientutil.Range{
+							Start:  int64(p.start),
+							Length: int64(p.end - p.start),
+						},
+						Style: base.PieceStyle_PLAIN,
+					},
+				})
+				assert.Nil(err, "get piece reader should be ok")
+				data, err := io.ReadAll(rd)
+				cl.Close()
+				assert.Nil(err, "read piece should be ok")
+				assert.Equal(p.end-p.start, len(data), "piece length should match")
+				assert.Equal(testBytes[p.start:p.end], data, "piece data should match")
+			}
+
+			rd, err := ts.ReadAllPieces(context.Background(), &ReadAllPiecesRequest{
+				PeerTaskMetadata: PeerTaskMetadata{
+					TaskID: taskID,
 				},
-				Style: base.PieceStyle_PLAIN,
-			},
+				Range: nil,
+			})
+			assert.Nil(err, "get all pieces reader should be ok")
+			data, err := io.ReadAll(rd)
+			assert.Nil(err, "read all pieces should be ok")
+			rd.Close()
+			assert.Equal(testBytes, data, "all pieces data should match")
+
+			if lts, ok := ts.(*localTaskStore); ok {
+				lts.genDigest(0, &WritePieceRequest{
+					GenPieceDigest: func(n int64) (total int32, gen bool) {
+						return int32(len(pieces)), true
+					},
+				})
+				assert.Equal(digestutils.Sha256(piecesMd5...), lts.PieceMd5Sign)
+
+				// clean up test data
+				lts.lastAccess.Store(time.Now().Add(-1 * time.Hour).UnixNano())
+				ok = lts.CanReclaim()
+				assert.True(ok, "task should gc")
+				err = lts.Reclaim()
+				assert.Nil(err, "task gc")
+			} else if lsts, ok := ts.(*localSubTaskStore); ok {
+				lsts.genDigest(0, &WritePieceRequest{
+					GenPieceDigest: func(n int64) (total int32, gen bool) {
+						return int32(len(pieces)), true
+					},
+				})
+				assert.Equal(digestutils.Sha256(piecesMd5...), lsts.PieceMd5Sign)
+
+				// keep original offset
+				err = lsts.Store(context.Background(),
+					&StoreRequest{
+						CommonTaskRequest: CommonTaskRequest{
+							Destination: dst,
+						},
+						MetadataOnly:   false,
+						StoreDataOnly:  false,
+						TotalPieces:    0,
+						OriginalOffset: true,
+					})
+				assert.Nil(err)
+				md5Store, err := calcFileMd5(dst, lsts.Range)
+				assert.Nil(err)
+				assert.Equal(md5Test, md5Store)
+
+				// just ranged data
+				err = lsts.Store(context.Background(),
+					&StoreRequest{
+						CommonTaskRequest: CommonTaskRequest{
+							Destination: dst,
+						},
+						MetadataOnly:   false,
+						StoreDataOnly:  false,
+						TotalPieces:    0,
+						OriginalOffset: false,
+					})
+				assert.Nil(err)
+				md5Store, err = calcFileMd5(dst, nil)
+				assert.Nil(err)
+				assert.Equal(md5Test, md5Store)
+
+				// clean up test data
+				lsts.parent.lastAccess.Store(time.Now().Add(-1 * time.Hour).UnixNano())
+				lsts.parent.Done = true
+
+				ok = lsts.CanReclaim()
+				assert.True(ok, "sub task should gc")
+				err = lsts.Reclaim()
+				assert.Nil(err, "sub task gc")
+
+				ok = lsts.parent.CanReclaim()
+				assert.True(ok, "parent task should gc")
+				err = lsts.parent.Reclaim()
+				assert.Nil(err, "parent task gc")
+			}
 		})
-		assert.Nil(err, "get piece should be ok")
-		data, err := io.ReadAll(rd)
-		cl.Close()
-		assert.Nil(err, "read piece should be ok")
-		assert.Equal(p.end-p.start, len(data), "piece length should match")
-		assert.Equal(testBytes[p.start:p.end], data, "piece data should match")
 	}
-
-	// clean up test data
-	ts.(*localTaskStore).lastAccess.Store(time.Now().Add(-1 * time.Hour).UnixNano())
-	ok = ts.(Reclaimer).CanReclaim()
-	assert.True(ok, "task should gc")
-	err = ts.(Reclaimer).Reclaim()
-	assert.Nil(err, "task gc")
 }
 
 func TestLocalTaskStore_StoreTaskData_Simple(t *testing.T) {
@@ -211,146 +360,7 @@ func TestLocalTaskStore_StoreTaskData_Simple(t *testing.T) {
 	assert.Equal(testData, bs, "data must match")
 }
 
-func TestLocalTaskStore_ReloadPersistentTask_Simple(t *testing.T) {
-
-}
-
-func TestLocalTaskStore_PutAndGetPiece_Advance(t *testing.T) {
-	assert := testifyassert.New(t)
-	testBytes, err := os.ReadFile(test.File)
-	assert.Nil(err, "load test file")
-
-	dst := path.Join(test.DataDir, taskData+".copy")
-	dst, _ = filepath.Abs(dst)
-	defer os.Remove(dst)
-
-	var (
-		taskID    = "task-d4bb1c273a9889fea14abd4651994fe8"
-		peerID    = "peer-d4bb1c273a9889fea14abd4651994fe8"
-		pieceSize = 512
-	)
-	sm, err := NewStorageManager(config.AdvanceLocalTaskStoreStrategy,
-		&config.StorageOption{
-			DataPath: test.DataDir,
-			TaskExpireTime: clientutil.Duration{
-				Duration: time.Minute,
-			},
-		}, func(request CommonTaskRequest) {
-		})
-	if err != nil {
-		t.Fatal(err)
-	}
-
-	var s = sm.(*storageManager)
-
-	_, err = s.CreateTask(
-		RegisterTaskRequest{
-			CommonTaskRequest: CommonTaskRequest{
-				PeerID:      peerID,
-				TaskID:      taskID,
-				Destination: dst,
-			},
-			ContentLength: int64(len(testBytes)),
-		})
-	assert.Nil(err, "create task storage")
-	ts, ok := s.LoadTask(PeerTaskMetadata{
-		PeerID: peerID,
-		TaskID: taskID,
-	})
-	assert.True(ok, "")
-
-	var pieces []struct {
-		index int
-		start int
-		end   int // not contain in data
-	}
-	for i := 0; i*pieceSize < len(testBytes); i++ {
-		start := i * pieceSize
-		end := start + pieceSize
-		if end > len(testBytes) {
-			end = len(testBytes)
-		}
-		pieces = append(pieces, struct {
-			index int
-			start int
-			end   int
-		}{
-			index: i,
-			start: start,
-			end:   end,
-		})
-	}
-	rand.Seed(time.Now().UnixNano())
-	rand.Shuffle(len(pieces), func(i, j int) { pieces[i], pieces[j] = pieces[j], pieces[i] })
-
-	// random put all pieces
-	for _, p := range pieces {
-		_, err = ts.WritePiece(context.Background(), &WritePieceRequest{
-			PeerTaskMetadata: PeerTaskMetadata{
-				TaskID: taskID,
-			},
-			PieceMetadata: PieceMetadata{
-				Num:    int32(p.index),
-				Md5:    "",
-				Offset: uint64(p.start),
-				Range: clientutil.Range{
-					Start:  int64(p.start),
-					Length: int64(p.end - p.start),
-				},
-				Style: base.PieceStyle_PLAIN,
-			},
-			Reader: bytes.NewBuffer(testBytes[p.start:p.end]),
-		})
-		assert.Nil(err, "put piece")
-	}
-
-	md5Test, _ := calcFileMd5(test.File)
-	md5TaskData, _ := calcFileMd5(path.Join(ts.(*localTaskStore).dataDir, taskData))
-	assert.Equal(md5Test, md5TaskData, "md5 must match")
-
-	// shuffle again for get all pieces
-	rand.Shuffle(len(pieces), func(i, j int) { pieces[i], pieces[j] = pieces[j], pieces[i] })
-	for _, p := range pieces {
-		rd, cl, err := ts.ReadPiece(context.Background(), &ReadPieceRequest{
-			PeerTaskMetadata: PeerTaskMetadata{
-				TaskID: taskID,
-			},
-			PieceMetadata: PieceMetadata{
-				Num:    int32(p.index),
-				Md5:    "",
-				Offset: uint64(p.start),
-				Range: clientutil.Range{
-					Start:  int64(p.start),
-					Length: int64(p.end - p.start),
-				},
-				Style: base.PieceStyle_PLAIN,
-			},
-		})
-		assert.Nil(err, "get piece should be ok")
-		data, err := io.ReadAll(rd)
-		cl.Close()
-		assert.Nil(err, "read piece should be ok")
-		assert.Equal(p.end-p.start, len(data), "piece length should match")
-		assert.Equal(testBytes[p.start:p.end], data, "piece data should match")
-	}
-
-	// clean up test data
-	ts.(*localTaskStore).lastAccess.Store(time.Now().Add(-1 * time.Hour).UnixNano())
-	ok = ts.(Reclaimer).CanReclaim()
-	assert.True(ok, "task should gc")
-	err = ts.(Reclaimer).Reclaim()
-	assert.Nil(err, "task gc")
-}
-
-func TestLocalTaskStore_StoreTaskData_Advance(t *testing.T) {
-
-}
-
-func TestLocalTaskStore_ReloadPersistentTask_Advance(t *testing.T) {
-
-}
-
-func calcFileMd5(filePath string) (string, error) {
+func calcFileMd5(filePath string, rg *clientutil.Range) (string, error) {
 	var md5String string
 	file, err := os.Open(filePath)
 	if err != nil {
@@ -358,11 +368,26 @@ func calcFileMd5(filePath string) (string, error) {
 	}
 	defer file.Close()
 
+	var rd io.Reader = file
+	if rg != nil {
+		rd = io.LimitReader(file, rg.Length)
+		_, err = file.Seek(rg.Start, io.SeekStart)
+		if err != nil {
+			return "", err
+		}
+	}
+
 	hash := md5.New()
-	if _, err := io.Copy(hash, file); err != nil {
+	if _, err := io.Copy(hash, rd); err != nil {
 		return md5String, err
 	}
 	hashInBytes := hash.Sum(nil)[:16]
 	md5String = hex.EncodeToString(hashInBytes)
 	return md5String, nil
 }
+
+func calcPieceMd5(data []byte) string {
+	hash := md5.New()
+	hash.Write(data)
+	return hex.EncodeToString(hash.Sum(nil)[:16])
+}
diff --git a/client/daemon/test/mock/storage/manager.go b/client/daemon/test/mock/storage/manager.go
index aab19792..ecf6f540 100644
--- a/client/daemon/test/mock/storage/manager.go
+++ b/client/daemon/test/mock/storage/manager.go
@@ -268,6 +268,20 @@ func (mr *MockManagerMockRecorder) CleanUp() *gomock.Call {
 	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "CleanUp", reflect.TypeOf((*MockManager)(nil).CleanUp))
 }
 
+// FindCompletedSubTask mocks base method.
+func (m *MockManager) FindCompletedSubTask(taskID string) *storage.ReusePeerTask {
+	m.ctrl.T.Helper()
+	ret := m.ctrl.Call(m, "FindCompletedSubTask", taskID)
+	ret0, _ := ret[0].(*storage.ReusePeerTask)
+	return ret0
+}
+
+// FindCompletedSubTask indicates an expected call of FindCompletedSubTask.
+func (mr *MockManagerMockRecorder) FindCompletedSubTask(taskID interface{}) *gomock.Call {
+	mr.mock.ctrl.T.Helper()
+	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "FindCompletedSubTask", reflect.TypeOf((*MockManager)(nil).FindCompletedSubTask), taskID)
+}
+
 // FindCompletedTask mocks base method.
 func (m *MockManager) FindCompletedTask(taskID string) *storage.ReusePeerTask {
 	m.ctrl.T.Helper()
@@ -355,8 +369,23 @@ func (mr *MockManagerMockRecorder) ReadPiece(ctx, req interface{}) *gomock.Call
 	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "ReadPiece", reflect.TypeOf((*MockManager)(nil).ReadPiece), ctx, req)
 }
 
+// RegisterSubTask mocks base method.
+func (m *MockManager) RegisterSubTask(ctx context.Context, req *storage.RegisterSubTaskRequest) (storage.TaskStorageDriver, error) {
+	m.ctrl.T.Helper()
+	ret := m.ctrl.Call(m, "RegisterSubTask", ctx, req)
+	ret0, _ := ret[0].(storage.TaskStorageDriver)
+	ret1, _ := ret[1].(error)
+	return ret0, ret1
+}
+
+// RegisterSubTask indicates an expected call of RegisterSubTask.
+func (mr *MockManagerMockRecorder) RegisterSubTask(ctx, req interface{}) *gomock.Call {
+	mr.mock.ctrl.T.Helper()
+	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "RegisterSubTask", reflect.TypeOf((*MockManager)(nil).RegisterSubTask), ctx, req)
+}
+
 // RegisterTask mocks base method.
-func (m *MockManager) RegisterTask(ctx context.Context, req storage.RegisterTaskRequest) (storage.TaskStorageDriver, error) {
+func (m *MockManager) RegisterTask(ctx context.Context, req *storage.RegisterTaskRequest) (storage.TaskStorageDriver, error) {
 	m.ctrl.T.Helper()
 	ret := m.ctrl.Call(m, "RegisterTask", ctx, req)
 	ret0, _ := ret[0].(storage.TaskStorageDriver)
diff --git a/scheduler/scheduler/scheduler_test.go b/scheduler/scheduler/scheduler_test.go
index 528b7279..d14a1bce 100644
--- a/scheduler/scheduler/scheduler_test.go
+++ b/scheduler/scheduler/scheduler_test.go
@@ -26,12 +26,14 @@ import (
 	"github.com/golang/mock/gomock"
 	"github.com/stretchr/testify/assert"
 
+	"d7y.io/dragonfly/v2/manager/types"
 	"d7y.io/dragonfly/v2/pkg/container/set"
 	"d7y.io/dragonfly/v2/pkg/idgen"
 	"d7y.io/dragonfly/v2/pkg/rpc/base"
 	rpcscheduler "d7y.io/dragonfly/v2/pkg/rpc/scheduler"
 	rpcschedulermocks "d7y.io/dragonfly/v2/pkg/rpc/scheduler/mocks"
 	"d7y.io/dragonfly/v2/scheduler/config"
+	configmocks "d7y.io/dragonfly/v2/scheduler/config/mocks"
 	"d7y.io/dragonfly/v2/scheduler/resource"
 	"d7y.io/dragonfly/v2/scheduler/scheduler/evaluator"
 )
@@ -109,7 +111,11 @@ func TestScheduler_New(t *testing.T) {
 
 	for _, tc := range tests {
 		t.Run(tc.name, func(t *testing.T) {
-			tc.expect(t, New(mockSchedulerConfig, tc.pluginDir))
+			ctl := gomock.NewController(t)
+			defer ctl.Finish()
+			dynconfig := configmocks.NewMockDynconfigInterface(ctl)
+
+			tc.expect(t, New(mockSchedulerConfig, dynconfig, tc.pluginDir))
 		})
 	}
 }
@@ -117,12 +123,12 @@ func TestScheduler_New(t *testing.T) {
 func TestCallback_ScheduleParent(t *testing.T) {
 	tests := []struct {
 		name   string
-		mock   func(cancel context.CancelFunc, peer *resource.Peer, cdnPeer *resource.Peer, blocklist set.SafeSet, stream rpcscheduler.Scheduler_ReportPieceResultServer, mr *rpcschedulermocks.MockScheduler_ReportPieceResultServerMockRecorder)
+		mock   func(cancel context.CancelFunc, peer *resource.Peer, cdnPeer *resource.Peer, blocklist set.SafeSet, stream rpcscheduler.Scheduler_ReportPieceResultServer, mr *rpcschedulermocks.MockScheduler_ReportPieceResultServerMockRecorder, md *configmocks.MockDynconfigInterfaceMockRecorder)
 		expect func(t *testing.T, peer *resource.Peer)
 	}{
 		{
 			name: "context was done",
-			mock: func(cancel context.CancelFunc, peer *resource.Peer, cdnPeer *resource.Peer, blocklist set.SafeSet, stream rpcscheduler.Scheduler_ReportPieceResultServer, mr *rpcschedulermocks.MockScheduler_ReportPieceResultServerMockRecorder) {
+			mock: func(cancel context.CancelFunc, peer *resource.Peer, cdnPeer *resource.Peer, blocklist set.SafeSet, stream rpcscheduler.Scheduler_ReportPieceResultServer, mr *rpcschedulermocks.MockScheduler_ReportPieceResultServerMockRecorder, md *configmocks.MockDynconfigInterfaceMockRecorder) {
 				peer.FSM.SetState(resource.PeerStateRunning)
 				cancel()
 			},
@@ -133,7 +139,7 @@ func TestCallback_ScheduleParent(t *testing.T) {
 		},
 		{
 			name: "cdn peer state is PeerStateFailed and peer stream load failed",
-			mock: func(cancel context.CancelFunc, peer *resource.Peer, cdnPeer *resource.Peer, blocklist set.SafeSet, stream rpcscheduler.Scheduler_ReportPieceResultServer, mr *rpcschedulermocks.MockScheduler_ReportPieceResultServerMockRecorder) {
+			mock: func(cancel context.CancelFunc, peer *resource.Peer, cdnPeer *resource.Peer, blocklist set.SafeSet, stream rpcscheduler.Scheduler_ReportPieceResultServer, mr *rpcschedulermocks.MockScheduler_ReportPieceResultServerMockRecorder, md *configmocks.MockDynconfigInterfaceMockRecorder) {
 				task := peer.Task
 				task.StorePeer(peer)
 				task.StorePeer(cdnPeer)
@@ -147,7 +153,7 @@ func TestCallback_ScheduleParent(t *testing.T) {
 		},
 		{
 			name: "cdn peer state is PeerStateFailed and send Code_SchedNeedBackSource code failed",
-			mock: func(cancel context.CancelFunc, peer *resource.Peer, cdnPeer *resource.Peer, blocklist set.SafeSet, stream rpcscheduler.Scheduler_ReportPieceResultServer, mr *rpcschedulermocks.MockScheduler_ReportPieceResultServerMockRecorder) {
+			mock: func(cancel context.CancelFunc, peer *resource.Peer, cdnPeer *resource.Peer, blocklist set.SafeSet, stream rpcscheduler.Scheduler_ReportPieceResultServer, mr *rpcschedulermocks.MockScheduler_ReportPieceResultServerMockRecorder, md *configmocks.MockDynconfigInterfaceMockRecorder) {
 				task := peer.Task
 				task.StorePeer(peer)
 				task.StorePeer(cdnPeer)
@@ -167,7 +173,7 @@ func TestCallback_ScheduleParent(t *testing.T) {
 		},
 		{
 			name: "cdn peer state is PeerStateFailed and send Code_SchedNeedBackSource code success",
-			mock: func(cancel context.CancelFunc, peer *resource.Peer, cdnPeer *resource.Peer, blocklist set.SafeSet, stream rpcscheduler.Scheduler_ReportPieceResultServer, mr *rpcschedulermocks.MockScheduler_ReportPieceResultServerMockRecorder) {
+			mock: func(cancel context.CancelFunc, peer *resource.Peer, cdnPeer *resource.Peer, blocklist set.SafeSet, stream rpcscheduler.Scheduler_ReportPieceResultServer, mr *rpcschedulermocks.MockScheduler_ReportPieceResultServerMockRecorder, md *configmocks.MockDynconfigInterfaceMockRecorder) {
 				task := peer.Task
 				task.StorePeer(peer)
 				task.StorePeer(cdnPeer)
@@ -188,7 +194,7 @@ func TestCallback_ScheduleParent(t *testing.T) {
 		},
 		{
 			name: "cdn peer state is PeerStateFailed and task state is PeerStateFailed",
-			mock: func(cancel context.CancelFunc, peer *resource.Peer, cdnPeer *resource.Peer, blocklist set.SafeSet, stream rpcscheduler.Scheduler_ReportPieceResultServer, mr *rpcschedulermocks.MockScheduler_ReportPieceResultServerMockRecorder) {
+			mock: func(cancel context.CancelFunc, peer *resource.Peer, cdnPeer *resource.Peer, blocklist set.SafeSet, stream rpcscheduler.Scheduler_ReportPieceResultServer, mr *rpcschedulermocks.MockScheduler_ReportPieceResultServerMockRecorder, md *configmocks.MockDynconfigInterfaceMockRecorder) {
 				task := peer.Task
 				task.StorePeer(peer)
 				task.StorePeer(cdnPeer)
@@ -210,7 +216,7 @@ func TestCallback_ScheduleParent(t *testing.T) {
 		},
 		{
 			name: "cdn peer state is PeerStateFailed and task state is PeerStateFailed",
-			mock: func(cancel context.CancelFunc, peer *resource.Peer, cdnPeer *resource.Peer, blocklist set.SafeSet, stream rpcscheduler.Scheduler_ReportPieceResultServer, mr *rpcschedulermocks.MockScheduler_ReportPieceResultServerMockRecorder) {
+			mock: func(cancel context.CancelFunc, peer *resource.Peer, cdnPeer *resource.Peer, blocklist set.SafeSet, stream rpcscheduler.Scheduler_ReportPieceResultServer, mr *rpcschedulermocks.MockScheduler_ReportPieceResultServerMockRecorder, md *configmocks.MockDynconfigInterfaceMockRecorder) {
 				task := peer.Task
 				task.StorePeer(peer)
 				task.StorePeer(cdnPeer)
@@ -232,7 +238,7 @@ func TestCallback_ScheduleParent(t *testing.T) {
 		},
 		{
 			name: "schedule exceeds RetryBackSourceLimit and peer stream load failed",
-			mock: func(cancel context.CancelFunc, peer *resource.Peer, cdnPeer *resource.Peer, blocklist set.SafeSet, stream rpcscheduler.Scheduler_ReportPieceResultServer, mr *rpcschedulermocks.MockScheduler_ReportPieceResultServerMockRecorder) {
+			mock: func(cancel context.CancelFunc, peer *resource.Peer, cdnPeer *resource.Peer, blocklist set.SafeSet, stream rpcscheduler.Scheduler_ReportPieceResultServer, mr *rpcschedulermocks.MockScheduler_ReportPieceResultServerMockRecorder, md *configmocks.MockDynconfigInterfaceMockRecorder) {
 				task := peer.Task
 				task.StorePeer(peer)
 				peer.FSM.SetState(resource.PeerStateRunning)
@@ -244,7 +250,7 @@ func TestCallback_ScheduleParent(t *testing.T) {
 		},
 		{
 			name: "cdn peer state is PeerStateFailed and send Code_SchedNeedBackSource code failed",
-			mock: func(cancel context.CancelFunc, peer *resource.Peer, cdnPeer *resource.Peer, blocklist set.SafeSet, stream rpcscheduler.Scheduler_ReportPieceResultServer, mr *rpcschedulermocks.MockScheduler_ReportPieceResultServerMockRecorder) {
+			mock: func(cancel context.CancelFunc, peer *resource.Peer, cdnPeer *resource.Peer, blocklist set.SafeSet, stream rpcscheduler.Scheduler_ReportPieceResultServer, mr *rpcschedulermocks.MockScheduler_ReportPieceResultServerMockRecorder, md *configmocks.MockDynconfigInterfaceMockRecorder) {
 				task := peer.Task
 				task.StorePeer(peer)
 				peer.FSM.SetState(resource.PeerStateRunning)
@@ -262,7 +268,7 @@ func TestCallback_ScheduleParent(t *testing.T) {
 		},
 		{
 			name: "cdn peer state is PeerStateFailed and send Code_SchedNeedBackSource code success",
-			mock: func(cancel context.CancelFunc, peer *resource.Peer, cdnPeer *resource.Peer, blocklist set.SafeSet, stream rpcscheduler.Scheduler_ReportPieceResultServer, mr *rpcschedulermocks.MockScheduler_ReportPieceResultServerMockRecorder) {
+			mock: func(cancel context.CancelFunc, peer *resource.Peer, cdnPeer *resource.Peer, blocklist set.SafeSet, stream rpcscheduler.Scheduler_ReportPieceResultServer, mr *rpcschedulermocks.MockScheduler_ReportPieceResultServerMockRecorder, md *configmocks.MockDynconfigInterfaceMockRecorder) {
 				task := peer.Task
 				task.StorePeer(peer)
 				peer.FSM.SetState(resource.PeerStateRunning)
@@ -281,7 +287,7 @@ func TestCallback_ScheduleParent(t *testing.T) {
 		},
 		{
 			name: "cdn peer state is PeerStateFailed and task state is PeerStateFailed",
-			mock: func(cancel context.CancelFunc, peer *resource.Peer, cdnPeer *resource.Peer, blocklist set.SafeSet, stream rpcscheduler.Scheduler_ReportPieceResultServer, mr *rpcschedulermocks.MockScheduler_ReportPieceResultServerMockRecorder) {
+			mock: func(cancel context.CancelFunc, peer *resource.Peer, cdnPeer *resource.Peer, blocklist set.SafeSet, stream rpcscheduler.Scheduler_ReportPieceResultServer, mr *rpcschedulermocks.MockScheduler_ReportPieceResultServerMockRecorder, md *configmocks.MockDynconfigInterfaceMockRecorder) {
 				task := peer.Task
 				task.StorePeer(peer)
 				peer.FSM.SetState(resource.PeerStateRunning)
@@ -301,7 +307,7 @@ func TestCallback_ScheduleParent(t *testing.T) {
 		},
 		{
 			name: "cdn peer state is PeerStateFailed and task state is PeerStateFailed",
-			mock: func(cancel context.CancelFunc, peer *resource.Peer, cdnPeer *resource.Peer, blocklist set.SafeSet, stream rpcscheduler.Scheduler_ReportPieceResultServer, mr *rpcschedulermocks.MockScheduler_ReportPieceResultServerMockRecorder) {
+			mock: func(cancel context.CancelFunc, peer *resource.Peer, cdnPeer *resource.Peer, blocklist set.SafeSet, stream rpcscheduler.Scheduler_ReportPieceResultServer, mr *rpcschedulermocks.MockScheduler_ReportPieceResultServerMockRecorder, md *configmocks.MockDynconfigInterfaceMockRecorder) {
 				task := peer.Task
 				task.StorePeer(peer)
 				peer.FSM.SetState(resource.PeerStateRunning)
@@ -321,7 +327,7 @@ func TestCallback_ScheduleParent(t *testing.T) {
 		},
 		{
 			name: "schedule exceeds RetryLimit and peer stream load failed",
-			mock: func(cancel context.CancelFunc, peer *resource.Peer, cdnPeer *resource.Peer, blocklist set.SafeSet, stream rpcscheduler.Scheduler_ReportPieceResultServer, mr *rpcschedulermocks.MockScheduler_ReportPieceResultServerMockRecorder) {
+			mock: func(cancel context.CancelFunc, peer *resource.Peer, cdnPeer *resource.Peer, blocklist set.SafeSet, stream rpcscheduler.Scheduler_ReportPieceResultServer, mr *rpcschedulermocks.MockScheduler_ReportPieceResultServerMockRecorder, md *configmocks.MockDynconfigInterfaceMockRecorder) {
 				task := peer.Task
 				task.StorePeer(peer)
 				peer.FSM.SetState(resource.PeerStateRunning)
@@ -336,7 +342,7 @@ func TestCallback_ScheduleParent(t *testing.T) {
 		},
 		{
 			name: "schedule exceeds RetryLimit and send Code_SchedTaskStatusError code failed",
-			mock: func(cancel context.CancelFunc, peer *resource.Peer, cdnPeer *resource.Peer, blocklist set.SafeSet, stream rpcscheduler.Scheduler_ReportPieceResultServer, mr *rpcschedulermocks.MockScheduler_ReportPieceResultServerMockRecorder) {
+			mock: func(cancel context.CancelFunc, peer *resource.Peer, cdnPeer *resource.Peer, blocklist set.SafeSet, stream rpcscheduler.Scheduler_ReportPieceResultServer, mr *rpcschedulermocks.MockScheduler_ReportPieceResultServerMockRecorder, md *configmocks.MockDynconfigInterfaceMockRecorder) {
 				task := peer.Task
 				task.StorePeer(peer)
 				peer.FSM.SetState(resource.PeerStateRunning)
@@ -354,7 +360,7 @@ func TestCallback_ScheduleParent(t *testing.T) {
 		},
 		{
 			name: "schedule exceeds RetryLimit and send Code_SchedTaskStatusError code success",
-			mock: func(cancel context.CancelFunc, peer *resource.Peer, cdnPeer *resource.Peer, blocklist set.SafeSet, stream rpcscheduler.Scheduler_ReportPieceResultServer, mr *rpcschedulermocks.MockScheduler_ReportPieceResultServerMockRecorder) {
+			mock: func(cancel context.CancelFunc, peer *resource.Peer, cdnPeer *resource.Peer, blocklist set.SafeSet, stream rpcscheduler.Scheduler_ReportPieceResultServer, mr *rpcschedulermocks.MockScheduler_ReportPieceResultServerMockRecorder, md *configmocks.MockDynconfigInterfaceMockRecorder) {
 				task := peer.Task
 				task.StorePeer(peer)
 				peer.FSM.SetState(resource.PeerStateRunning)
@@ -372,14 +378,19 @@ func TestCallback_ScheduleParent(t *testing.T) {
 		},
 		{
 			name: "schedule succeeded",
-			mock: func(cancel context.CancelFunc, peer *resource.Peer, cdnPeer *resource.Peer, blocklist set.SafeSet, stream rpcscheduler.Scheduler_ReportPieceResultServer, mr *rpcschedulermocks.MockScheduler_ReportPieceResultServerMockRecorder) {
+			mock: func(cancel context.CancelFunc, peer *resource.Peer, cdnPeer *resource.Peer, blocklist set.SafeSet, stream rpcscheduler.Scheduler_ReportPieceResultServer, mr *rpcschedulermocks.MockScheduler_ReportPieceResultServerMockRecorder, md *configmocks.MockDynconfigInterfaceMockRecorder) {
 				task := peer.Task
 				task.StorePeer(peer)
 				task.StorePeer(cdnPeer)
 				peer.FSM.SetState(resource.PeerStateRunning)
 				cdnPeer.FSM.SetState(resource.PeerStateRunning)
 				peer.StoreStream(stream)
-				mr.Send(gomock.Any()).Return(nil).Times(1)
+				gomock.InOrder(
+					md.GetSchedulerClusterClientConfig().Return(types.SchedulerClusterClientConfig{
+						ParallelCount: 2,
+					}, true).Times(1),
+					mr.Send(gomock.Any()).Return(nil).Times(1),
+				)
 			},
 			expect: func(t *testing.T, peer *resource.Peer) {
 				assert := assert.New(t)
@@ -395,6 +406,7 @@ func TestCallback_ScheduleParent(t *testing.T) {
 			ctl := gomock.NewController(t)
 			defer ctl.Finish()
 			stream := rpcschedulermocks.NewMockScheduler_ReportPieceResultServer(ctl)
+			dynconfig := configmocks.NewMockDynconfigInterface(ctl)
 			ctx, cancel := context.WithCancel(context.Background())
 			mockHost := resource.NewHost(mockRawHost)
 			mockTask := resource.NewTask(mockTaskID, mockTaskURL, mockTaskBackToSourceLimit, mockTaskURLMeta)
@@ -403,8 +415,8 @@ func TestCallback_ScheduleParent(t *testing.T) {
 			cdnPeer := resource.NewPeer(mockCDNPeerID, mockTask, mockCDNHost)
 			blocklist := set.NewSafeSet()
 
-			tc.mock(cancel, peer, cdnPeer, blocklist, stream, stream.EXPECT())
-			scheduler := New(mockSchedulerConfig, mockPluginDir)
+			tc.mock(cancel, peer, cdnPeer, blocklist, stream, stream.EXPECT(), dynconfig.EXPECT())
+			scheduler := New(mockSchedulerConfig, dynconfig, mockPluginDir)
 			scheduler.ScheduleParent(ctx, peer, blocklist)
 			tc.expect(t, peer)
 		})
@@ -414,12 +426,12 @@ func TestCallback_ScheduleParent(t *testing.T) {
 func TestScheduler_NotifyAndFindParent(t *testing.T) {
 	tests := []struct {
 		name   string
-		mock   func(peer *resource.Peer, mockPeer *resource.Peer, blocklist set.SafeSet, stream rpcscheduler.Scheduler_ReportPieceResultServer, ms *rpcschedulermocks.MockScheduler_ReportPieceResultServerMockRecorder)
+		mock   func(peer *resource.Peer, mockPeer *resource.Peer, blocklist set.SafeSet, stream rpcscheduler.Scheduler_ReportPieceResultServer, dynconfig config.DynconfigInterface, ms *rpcschedulermocks.MockScheduler_ReportPieceResultServerMockRecorder, md *configmocks.MockDynconfigInterfaceMockRecorder)
 		expect func(t *testing.T, parents []*resource.Peer, ok bool)
 	}{
 		{
 			name: "peer state is PeerStatePending",
-			mock: func(peer *resource.Peer, mockPeer *resource.Peer, blocklist set.SafeSet, stream rpcscheduler.Scheduler_ReportPieceResultServer, ms *rpcschedulermocks.MockScheduler_ReportPieceResultServerMockRecorder) {
+			mock: func(peer *resource.Peer, mockPeer *resource.Peer, blocklist set.SafeSet, stream rpcscheduler.Scheduler_ReportPieceResultServer, dynconfig config.DynconfigInterface, ms *rpcschedulermocks.MockScheduler_ReportPieceResultServerMockRecorder, md *configmocks.MockDynconfigInterfaceMockRecorder) {
 				peer.FSM.SetState(resource.PeerStatePending)
 			},
 			expect: func(t *testing.T, parents []*resource.Peer, ok bool) {
@@ -429,7 +441,7 @@ func TestScheduler_NotifyAndFindParent(t *testing.T) {
 		},
 		{
 			name: "peer state is PeerStateReceivedSmall",
-			mock: func(peer *resource.Peer, mockPeer *resource.Peer, blocklist set.SafeSet, stream rpcscheduler.Scheduler_ReportPieceResultServer, ms *rpcschedulermocks.MockScheduler_ReportPieceResultServerMockRecorder) {
+			mock: func(peer *resource.Peer, mockPeer *resource.Peer, blocklist set.SafeSet, stream rpcscheduler.Scheduler_ReportPieceResultServer, dynconfig config.DynconfigInterface, ms *rpcschedulermocks.MockScheduler_ReportPieceResultServerMockRecorder, md *configmocks.MockDynconfigInterfaceMockRecorder) {
 				peer.FSM.SetState(resource.PeerStateReceivedSmall)
 			},
 			expect: func(t *testing.T, parents []*resource.Peer, ok bool) {
@@ -439,7 +451,7 @@ func TestScheduler_NotifyAndFindParent(t *testing.T) {
 		},
 		{
 			name: "peer state is PeerStateReceivedNormal",
-			mock: func(peer *resource.Peer, mockPeer *resource.Peer, blocklist set.SafeSet, stream rpcscheduler.Scheduler_ReportPieceResultServer, ms *rpcschedulermocks.MockScheduler_ReportPieceResultServerMockRecorder) {
+			mock: func(peer *resource.Peer, mockPeer *resource.Peer, blocklist set.SafeSet, stream rpcscheduler.Scheduler_ReportPieceResultServer, dynconfig config.DynconfigInterface, ms *rpcschedulermocks.MockScheduler_ReportPieceResultServerMockRecorder, md *configmocks.MockDynconfigInterfaceMockRecorder) {
 				peer.FSM.SetState(resource.PeerStateReceivedNormal)
 			},
 			expect: func(t *testing.T, parents []*resource.Peer, ok bool) {
@@ -449,7 +461,7 @@ func TestScheduler_NotifyAndFindParent(t *testing.T) {
 		},
 		{
 			name: "peer state is PeerStateBackToSource",
-			mock: func(peer *resource.Peer, mockPeer *resource.Peer, blocklist set.SafeSet, stream rpcscheduler.Scheduler_ReportPieceResultServer, ms *rpcschedulermocks.MockScheduler_ReportPieceResultServerMockRecorder) {
+			mock: func(peer *resource.Peer, mockPeer *resource.Peer, blocklist set.SafeSet, stream rpcscheduler.Scheduler_ReportPieceResultServer, dynconfig config.DynconfigInterface, ms *rpcschedulermocks.MockScheduler_ReportPieceResultServerMockRecorder, md *configmocks.MockDynconfigInterfaceMockRecorder) {
 				peer.FSM.SetState(resource.PeerStateBackToSource)
 			},
 			expect: func(t *testing.T, parents []*resource.Peer, ok bool) {
@@ -459,7 +471,7 @@ func TestScheduler_NotifyAndFindParent(t *testing.T) {
 		},
 		{
 			name: "peer state is PeerStateSucceeded",
-			mock: func(peer *resource.Peer, mockPeer *resource.Peer, blocklist set.SafeSet, stream rpcscheduler.Scheduler_ReportPieceResultServer, ms *rpcschedulermocks.MockScheduler_ReportPieceResultServerMockRecorder) {
+			mock: func(peer *resource.Peer, mockPeer *resource.Peer, blocklist set.SafeSet, stream rpcscheduler.Scheduler_ReportPieceResultServer, dynconfig config.DynconfigInterface, ms *rpcschedulermocks.MockScheduler_ReportPieceResultServerMockRecorder, md *configmocks.MockDynconfigInterfaceMockRecorder) {
 				peer.FSM.SetState(resource.PeerStateSucceeded)
 			},
 			expect: func(t *testing.T, parents []*resource.Peer, ok bool) {
@@ -469,7 +481,7 @@ func TestScheduler_NotifyAndFindParent(t *testing.T) {
 		},
 		{
 			name: "peer state is PeerStateFailed",
-			mock: func(peer *resource.Peer, mockPeer *resource.Peer, blocklist set.SafeSet, stream rpcscheduler.Scheduler_ReportPieceResultServer, ms *rpcschedulermocks.MockScheduler_ReportPieceResultServerMockRecorder) {
+			mock: func(peer *resource.Peer, mockPeer *resource.Peer, blocklist set.SafeSet, stream rpcscheduler.Scheduler_ReportPieceResultServer, dynconfig config.DynconfigInterface, ms *rpcschedulermocks.MockScheduler_ReportPieceResultServerMockRecorder, md *configmocks.MockDynconfigInterfaceMockRecorder) {
 				peer.FSM.SetState(resource.PeerStateFailed)
 			},
 			expect: func(t *testing.T, parents []*resource.Peer, ok bool) {
@@ -479,7 +491,7 @@ func TestScheduler_NotifyAndFindParent(t *testing.T) {
 		},
 		{
 			name: "peer state is PeerStateLeave",
-			mock: func(peer *resource.Peer, mockPeer *resource.Peer, blocklist set.SafeSet, stream rpcscheduler.Scheduler_ReportPieceResultServer, ms *rpcschedulermocks.MockScheduler_ReportPieceResultServerMockRecorder) {
+			mock: func(peer *resource.Peer, mockPeer *resource.Peer, blocklist set.SafeSet, stream rpcscheduler.Scheduler_ReportPieceResultServer, dynconfig config.DynconfigInterface, ms *rpcschedulermocks.MockScheduler_ReportPieceResultServerMockRecorder, md *configmocks.MockDynconfigInterfaceMockRecorder) {
 				peer.FSM.SetState(resource.PeerStateLeave)
 			},
 			expect: func(t *testing.T, parents []*resource.Peer, ok bool) {
@@ -489,7 +501,7 @@ func TestScheduler_NotifyAndFindParent(t *testing.T) {
 		},
 		{
 			name: "task peers is empty",
-			mock: func(peer *resource.Peer, mockPeer *resource.Peer, blocklist set.SafeSet, stream rpcscheduler.Scheduler_ReportPieceResultServer, ms *rpcschedulermocks.MockScheduler_ReportPieceResultServerMockRecorder) {
+			mock: func(peer *resource.Peer, mockPeer *resource.Peer, blocklist set.SafeSet, stream rpcscheduler.Scheduler_ReportPieceResultServer, dynconfig config.DynconfigInterface, ms *rpcschedulermocks.MockScheduler_ReportPieceResultServerMockRecorder, md *configmocks.MockDynconfigInterfaceMockRecorder) {
 				peer.FSM.SetState(resource.PeerStateRunning)
 			},
 			expect: func(t *testing.T, parents []*resource.Peer, ok bool) {
@@ -499,7 +511,7 @@ func TestScheduler_NotifyAndFindParent(t *testing.T) {
 		},
 		{
 			name: "task contains only one peer and peer is itself",
-			mock: func(peer *resource.Peer, mockPeer *resource.Peer, blocklist set.SafeSet, stream rpcscheduler.Scheduler_ReportPieceResultServer, ms *rpcschedulermocks.MockScheduler_ReportPieceResultServerMockRecorder) {
+			mock: func(peer *resource.Peer, mockPeer *resource.Peer, blocklist set.SafeSet, stream rpcscheduler.Scheduler_ReportPieceResultServer, dynconfig config.DynconfigInterface, ms *rpcschedulermocks.MockScheduler_ReportPieceResultServerMockRecorder, md *configmocks.MockDynconfigInterfaceMockRecorder) {
 				peer.FSM.SetState(resource.PeerStateRunning)
 				peer.Task.StorePeer(peer)
 			},
@@ -510,7 +522,7 @@ func TestScheduler_NotifyAndFindParent(t *testing.T) {
 		},
 		{
 			name: "peer is in blocklist",
-			mock: func(peer *resource.Peer, mockPeer *resource.Peer, blocklist set.SafeSet, stream rpcscheduler.Scheduler_ReportPieceResultServer, ms *rpcschedulermocks.MockScheduler_ReportPieceResultServerMockRecorder) {
+			mock: func(peer *resource.Peer, mockPeer *resource.Peer, blocklist set.SafeSet, stream rpcscheduler.Scheduler_ReportPieceResultServer, dynconfig config.DynconfigInterface, ms *rpcschedulermocks.MockScheduler_ReportPieceResultServerMockRecorder, md *configmocks.MockDynconfigInterfaceMockRecorder) {
 				peer.FSM.SetState(resource.PeerStateRunning)
 				peer.Task.StorePeer(mockPeer)
 				blocklist.Add(mockPeer.ID)
@@ -522,7 +534,7 @@ func TestScheduler_NotifyAndFindParent(t *testing.T) {
 		},
 		{
 			name: "peer is bad node",
-			mock: func(peer *resource.Peer, mockPeer *resource.Peer, blocklist set.SafeSet, stream rpcscheduler.Scheduler_ReportPieceResultServer, ms *rpcschedulermocks.MockScheduler_ReportPieceResultServerMockRecorder) {
+			mock: func(peer *resource.Peer, mockPeer *resource.Peer, blocklist set.SafeSet, stream rpcscheduler.Scheduler_ReportPieceResultServer, dynconfig config.DynconfigInterface, ms *rpcschedulermocks.MockScheduler_ReportPieceResultServerMockRecorder, md *configmocks.MockDynconfigInterfaceMockRecorder) {
 				peer.FSM.SetState(resource.PeerStateRunning)
 				peer.FSM.SetState(resource.PeerStateFailed)
 				peer.Task.StorePeer(mockPeer)
@@ -534,7 +546,7 @@ func TestScheduler_NotifyAndFindParent(t *testing.T) {
 		},
 		{
 			name: "parent is peer's descendant",
-			mock: func(peer *resource.Peer, mockPeer *resource.Peer, blocklist set.SafeSet, stream rpcscheduler.Scheduler_ReportPieceResultServer, ms *rpcschedulermocks.MockScheduler_ReportPieceResultServerMockRecorder) {
+			mock: func(peer *resource.Peer, mockPeer *resource.Peer, blocklist set.SafeSet, stream rpcscheduler.Scheduler_ReportPieceResultServer, dynconfig config.DynconfigInterface, ms *rpcschedulermocks.MockScheduler_ReportPieceResultServerMockRecorder, md *configmocks.MockDynconfigInterfaceMockRecorder) {
 				peer.FSM.SetState(resource.PeerStateRunning)
 				mockPeer.FSM.SetState(resource.PeerStateRunning)
 				peer.Task.StorePeer(mockPeer)
@@ -547,7 +559,7 @@ func TestScheduler_NotifyAndFindParent(t *testing.T) {
 		},
 		{
 			name: "parent is peer's ancestor",
-			mock: func(peer *resource.Peer, mockPeer *resource.Peer, blocklist set.SafeSet, stream rpcscheduler.Scheduler_ReportPieceResultServer, ms *rpcschedulermocks.MockScheduler_ReportPieceResultServerMockRecorder) {
+			mock: func(peer *resource.Peer, mockPeer *resource.Peer, blocklist set.SafeSet, stream rpcscheduler.Scheduler_ReportPieceResultServer, dynconfig config.DynconfigInterface, ms *rpcschedulermocks.MockScheduler_ReportPieceResultServerMockRecorder, md *configmocks.MockDynconfigInterfaceMockRecorder) {
 				peer.FSM.SetState(resource.PeerStateRunning)
 				mockPeer.FSM.SetState(resource.PeerStateRunning)
 				peer.Task.StorePeer(mockPeer)
@@ -560,7 +572,7 @@ func TestScheduler_NotifyAndFindParent(t *testing.T) {
 		},
 		{
 			name: "parent free upload load is zero",
-			mock: func(peer *resource.Peer, mockPeer *resource.Peer, blocklist set.SafeSet, stream rpcscheduler.Scheduler_ReportPieceResultServer, ms *rpcschedulermocks.MockScheduler_ReportPieceResultServerMockRecorder) {
+			mock: func(peer *resource.Peer, mockPeer *resource.Peer, blocklist set.SafeSet, stream rpcscheduler.Scheduler_ReportPieceResultServer, dynconfig config.DynconfigInterface, ms *rpcschedulermocks.MockScheduler_ReportPieceResultServerMockRecorder, md *configmocks.MockDynconfigInterfaceMockRecorder) {
 				peer.FSM.SetState(resource.PeerStateRunning)
 				mockPeer.FSM.SetState(resource.PeerStateRunning)
 				peer.Task.StorePeer(mockPeer)
@@ -573,7 +585,7 @@ func TestScheduler_NotifyAndFindParent(t *testing.T) {
 		},
 		{
 			name: "peer stream is empty",
-			mock: func(peer *resource.Peer, mockPeer *resource.Peer, blocklist set.SafeSet, stream rpcscheduler.Scheduler_ReportPieceResultServer, ms *rpcschedulermocks.MockScheduler_ReportPieceResultServerMockRecorder) {
+			mock: func(peer *resource.Peer, mockPeer *resource.Peer, blocklist set.SafeSet, stream rpcscheduler.Scheduler_ReportPieceResultServer, dynconfig config.DynconfigInterface, ms *rpcschedulermocks.MockScheduler_ReportPieceResultServerMockRecorder, md *configmocks.MockDynconfigInterfaceMockRecorder) {
 				peer.FSM.SetState(resource.PeerStateRunning)
 				mockPeer.FSM.SetState(resource.PeerStateRunning)
 				peer.Task.StorePeer(mockPeer)
@@ -586,13 +598,18 @@ func TestScheduler_NotifyAndFindParent(t *testing.T) {
 		},
 		{
 			name: "peer stream send failed",
-			mock: func(peer *resource.Peer, mockPeer *resource.Peer, blocklist set.SafeSet, stream rpcscheduler.Scheduler_ReportPieceResultServer, ms *rpcschedulermocks.MockScheduler_ReportPieceResultServerMockRecorder) {
+			mock: func(peer *resource.Peer, mockPeer *resource.Peer, blocklist set.SafeSet, stream rpcscheduler.Scheduler_ReportPieceResultServer, dynconfig config.DynconfigInterface, ms *rpcschedulermocks.MockScheduler_ReportPieceResultServerMockRecorder, md *configmocks.MockDynconfigInterfaceMockRecorder) {
 				peer.FSM.SetState(resource.PeerStateRunning)
 				mockPeer.FSM.SetState(resource.PeerStateRunning)
 				peer.Task.StorePeer(mockPeer)
 				mockPeer.Pieces.Set(0)
 				peer.StoreStream(stream)
-				ms.Send(gomock.Eq(constructSuccessPeerPacket(peer, mockPeer, []*resource.Peer{}))).Return(errors.New("foo")).Times(1)
+				gomock.InOrder(
+					md.GetSchedulerClusterClientConfig().Return(types.SchedulerClusterClientConfig{
+						ParallelCount: 2,
+					}, true).Times(1),
+					ms.Send(gomock.Any()).Return(errors.New("foo")).Times(1),
+				)
 			},
 			expect: func(t *testing.T, parents []*resource.Peer, ok bool) {
 				assert := assert.New(t)
@@ -601,13 +618,18 @@ func TestScheduler_NotifyAndFindParent(t *testing.T) {
 		},
 		{
 			name: "schedule parent",
-			mock: func(peer *resource.Peer, mockPeer *resource.Peer, blocklist set.SafeSet, stream rpcscheduler.Scheduler_ReportPieceResultServer, ms *rpcschedulermocks.MockScheduler_ReportPieceResultServerMockRecorder) {
+			mock: func(peer *resource.Peer, mockPeer *resource.Peer, blocklist set.SafeSet, stream rpcscheduler.Scheduler_ReportPieceResultServer, dynconfig config.DynconfigInterface, ms *rpcschedulermocks.MockScheduler_ReportPieceResultServerMockRecorder, md *configmocks.MockDynconfigInterfaceMockRecorder) {
 				peer.FSM.SetState(resource.PeerStateRunning)
 				mockPeer.FSM.SetState(resource.PeerStateRunning)
 				peer.Task.StorePeer(mockPeer)
 				mockPeer.Pieces.Set(0)
 				peer.StoreStream(stream)
-				ms.Send(gomock.Eq(constructSuccessPeerPacket(peer, mockPeer, []*resource.Peer{}))).Return(nil).Times(1)
+				gomock.InOrder(
+					md.GetSchedulerClusterClientConfig().Return(types.SchedulerClusterClientConfig{
+						ParallelCount: 2,
+					}, true).Times(1),
+					ms.Send(gomock.Any()).Return(nil).Times(1),
+				)
 			},
 			expect: func(t *testing.T, parents []*resource.Peer, ok bool) {
 				assert := assert.New(t)
@@ -622,14 +644,15 @@ func TestScheduler_NotifyAndFindParent(t *testing.T) {
 			ctl := gomock.NewController(t)
 			defer ctl.Finish()
 			stream := rpcschedulermocks.NewMockScheduler_ReportPieceResultServer(ctl)
+			dynconfig := configmocks.NewMockDynconfigInterface(ctl)
 			mockHost := resource.NewHost(mockRawHost)
 			mockTask := resource.NewTask(mockTaskID, mockTaskURL, mockTaskBackToSourceLimit, mockTaskURLMeta)
 			peer := resource.NewPeer(mockPeerID, mockTask, mockHost)
 			mockPeer := resource.NewPeer(idgen.PeerID("127.0.0.1"), mockTask, mockHost)
 			blocklist := set.NewSafeSet()
 
-			tc.mock(peer, mockPeer, blocklist, stream, stream.EXPECT())
-			scheduler := New(mockSchedulerConfig, mockPluginDir)
+			tc.mock(peer, mockPeer, blocklist, stream, dynconfig, stream.EXPECT(), dynconfig.EXPECT())
+			scheduler := New(mockSchedulerConfig, dynconfig, mockPluginDir)
 			parents, ok := scheduler.NotifyAndFindParent(context.Background(), peer, blocklist)
 			tc.expect(t, parents, ok)
 		})
@@ -730,6 +753,9 @@ func TestScheduler_FindParent(t *testing.T) {
 
 	for _, tc := range tests {
 		t.Run(tc.name, func(t *testing.T) {
+			ctl := gomock.NewController(t)
+			defer ctl.Finish()
+			dynconfig := configmocks.NewMockDynconfigInterface(ctl)
 			mockHost := resource.NewHost(mockRawHost)
 			mockTask := resource.NewTask(mockTaskID, mockTaskURL, mockTaskBackToSourceLimit, mockTaskURLMeta)
 			peer := resource.NewPeer(mockPeerID, mockTask, mockHost)
@@ -737,7 +763,7 @@ func TestScheduler_FindParent(t *testing.T) {
 			blocklist := set.NewSafeSet()
 
 			tc.mock(peer, mockPeer, blocklist)
-			scheduler := New(mockSchedulerConfig, mockPluginDir)
+			scheduler := New(mockSchedulerConfig, dynconfig, mockPluginDir)
 			parent, ok := scheduler.FindParent(context.Background(), peer, blocklist)
 			tc.expect(t, parent, ok)
 		})
diff --git a/test/e2e/dfget_test.go b/test/e2e/dfget_test.go
index 745b1752..8b389428 100644
--- a/test/e2e/dfget_test.go
+++ b/test/e2e/dfget_test.go
@@ -32,20 +32,21 @@ import (
 
 var _ = Describe("Download with dfget and proxy", func() {
 	Context("dfget", func() {
+		files := getFileSizes()
 		singleDfgetTest("dfget daemon download should be ok",
 			dragonflyNamespace, "component=dfdaemon",
-			"dragonfly-dfdaemon-", "dfdaemon")
+			"dragonfly-dfdaemon-", "dfdaemon", files)
 		for i := 0; i < 3; i++ {
 			singleDfgetTest(
 				fmt.Sprintf("dfget daemon proxy-%d should be ok", i),
 				dragonflyE2ENamespace,
 				fmt.Sprintf("statefulset.kubernetes.io/pod-name=proxy-%d", i),
-				"proxy-", "proxy")
+				"proxy-", "proxy", files)
 		}
 	})
 })
 
-func getFileDetails() map[string]int {
+func getFileSizes() map[string]int {
 	var details = map[string]int{}
 	for _, path := range e2eutil.GetFileList() {
 		out, err := e2eutil.DockerCommand("stat", "--printf=%s", path).CombinedOutput()
@@ -76,7 +77,7 @@ func getRandomRange(size int) *clientutil.Range {
 	return rg
 }
 
-func singleDfgetTest(name, ns, label, podNamePrefix, container string) {
+func singleDfgetTest(name, ns, label, podNamePrefix, container string, fileDetails map[string]int) {
 	It(name, func() {
 		out, err := e2eutil.KubeCtlCommand("-n", ns, "get", "pod", "-l", label,
 			"-o", "jsonpath='{range .items[*]}{.metadata.name}{end}'").CombinedOutput()
@@ -84,23 +85,41 @@ func singleDfgetTest(name, ns, label, podNamePrefix, container string) {
 		Expect(err).NotTo(HaveOccurred())
 		fmt.Println("test in pod: " + podName)
 		Expect(strings.HasPrefix(podName, podNamePrefix)).Should(BeTrue())
+
+		// copy test tools into container
+		if featureGates.Enabled(featureGateRange) {
+			out, err = e2eutil.KubeCtlCommand("-n", ns, "cp", "-c", container, "/tmp/sha256sum-offset",
+				fmt.Sprintf("%s:/bin/", podName)).CombinedOutput()
+			if err != nil {
+				fmt.Println(string(out))
+			}
+			Expect(err).NotTo(HaveOccurred())
+		}
+
 		pod := e2eutil.NewPodExec(ns, podName, container)
+
 		// install curl
 		_, err = pod.Command("apk", "add", "-U", "curl").CombinedOutput()
 		Expect(err).NotTo(HaveOccurred())
 
-		for path, size := range getFileDetails() {
+		for path, size := range fileDetails {
 			url1 := e2eutil.GetFileURL(path)
 			url2 := e2eutil.GetNoContentLengthFileURL(path)
 
 			// make ranged requests to invoke prefetch feature
 			if featureGates.Enabled(featureGateRange) {
-				rg := getRandomRange(size)
-				downloadSingleFile(ns, pod, path, url1, size, rg)
-				downloadSingleFile(ns, pod, path, url2, size, rg)
+				rg1, rg2 := getRandomRange(size), getRandomRange(size)
+				downloadSingleFile(ns, pod, path, url1, size, rg1)
+				downloadSingleFile(ns, pod, path, url1, size, rg2)
+				// FIXME no content length cases are always failed.
+				// downloadSingleFile(ns, pod, path, url2, size, rg)
 			}
+
 			downloadSingleFile(ns, pod, path, url1, size, nil)
-			downloadSingleFile(ns, pod, path, url2, size, nil)
+
+			if featureGates.Enabled(featureGateNoLength) {
+				downloadSingleFile(ns, pod, path, url2, size, nil)
+			}
 		}
 	})
 }
@@ -110,6 +129,9 @@ func downloadSingleFile(ns string, pod *e2eutil.PodExec, path, url string, size
 		sha256sum []string
 		dfget     []string
 		curl      []string
+
+		sha256sumOffset []string
+		dfgetOffset     []string
 	)
 
 	if rg == nil {
@@ -118,19 +140,25 @@ func downloadSingleFile(ns string, pod *e2eutil.PodExec, path, url string, size
 		curl = append(curl, "/usr/bin/curl", "-x", "http://127.0.0.1:65001", "-s", "--dump-header", "-", "-o", "/tmp/curl.out", url)
 	} else {
 		sha256sum = append(sha256sum, "sh", "-c",
-			fmt.Sprintf("dd if=%s ibs=1 skip=%d count=%d 2> /dev/null | /usr/bin/sha256sum", path, rg.Start, rg.Length))
+			fmt.Sprintf("/bin/sha256sum-offset -file %s -offset %d -length %d", path, rg.Start, rg.Length))
 		dfget = append(dfget, "/opt/dragonfly/bin/dfget", "-O", "/tmp/d7y.out", "-H",
 			fmt.Sprintf("Range: bytes=%d-%d", rg.Start, rg.Start+rg.Length-1), url)
 		curl = append(curl, "/usr/bin/curl", "-x", "http://127.0.0.1:65001", "-s", "--dump-header", "-", "-o", "/tmp/curl.out",
 			"--header", fmt.Sprintf("Range: bytes=%d-%d", rg.Start, rg.Start+rg.Length-1), url)
+
+		sha256sumOffset = append(sha256sumOffset, "sh", "-c",
+			fmt.Sprintf("/bin/sha256sum-offset -file %s -offset %d -length %d",
+				"/var/lib/dragonfly/d7y.offset.out", rg.Start, rg.Length))
+		dfgetOffset = append(dfgetOffset, "/opt/dragonfly/bin/dfget", "--original-offset", "-O", "/var/lib/dragonfly/d7y.offset.out", "-H",
+			fmt.Sprintf("Range: bytes=%d-%d", rg.Start, rg.Start+rg.Length-1), url)
 	}
 
 	fmt.Printf("--------------------------------------------------------------------------------\n\n")
 	if rg == nil {
-		fmt.Printf("download size %d\n", size)
+		fmt.Printf("download %s, size %d\n", url, size)
 	} else {
-		fmt.Printf("download range: bytes=%d-%d/%d, target length: %d\n",
-			rg.Start, rg.Start+rg.Length-1, size, rg.Length)
+		fmt.Printf("download %s, size %d, range: bytes=%d-%d/%d, target length: %d\n",
+			url, size, rg.Start, rg.Start+rg.Length-1, size, rg.Length)
 	}
 	// get original file digest
 	out, err := e2eutil.DockerCommand(sha256sum...).CombinedOutput()
@@ -159,6 +187,32 @@ func downloadSingleFile(ns string, pod *e2eutil.PodExec, path, url string, size
 	// slow download
 	Expect(end.Sub(start).Seconds() < 30.0).To(Equal(true))
 
+	// download file via dfget with offset
+	if rg != nil {
+		// move output for next cases and debugging
+		_, _ = pod.Command("/bin/sh", "-c", `
+                rm -f /var/lib/dragonfly/d7y.offset.out.last
+                cp -l /var/lib/dragonfly/d7y.offset.out /var/lib/dragonfly/d7y.offset.out.last
+                rm -f /var/lib/dragonfly/d7y.offset.out
+			`).CombinedOutput()
+
+		start = time.Now()
+		out, err = pod.Command(dfgetOffset...).CombinedOutput()
+		end = time.Now()
+		fmt.Println(string(out))
+		Expect(err).NotTo(HaveOccurred())
+
+		// get dfget downloaded file digest
+		out, err = pod.Command(sha256sumOffset...).CombinedOutput()
+		fmt.Println("dfget with offset sha256sum: " + string(out))
+		Expect(err).NotTo(HaveOccurred())
+		sha256sumz := strings.Split(string(out), " ")[0]
+		Expect(sha256sum1).To(Equal(sha256sumz))
+
+		// slow download
+		Expect(end.Sub(start).Seconds() < 30.0).To(Equal(true))
+	}
+
 	// skip dfdaemon
 	if ns == dragonflyNamespace {
 		fmt.Println("skip " + dragonflyNamespace + " namespace proxy tests")
diff --git a/test/e2e/e2e_test.go b/test/e2e/e2e_test.go
index ed761902..d6fab079 100644
--- a/test/e2e/e2e_test.go
+++ b/test/e2e/e2e_test.go
@@ -36,8 +36,9 @@ var (
 	featureGates     = featuregate.NewFeatureGate()
 	featureGatesFlag string
 
-	featureGateRange  featuregate.Feature = "dfget-range"
-	featureGateCommit featuregate.Feature = "dfget-commit"
+	featureGateRange    featuregate.Feature = "dfget-range"
+	featureGateCommit   featuregate.Feature = "dfget-commit"
+	featureGateNoLength featuregate.Feature = "dfget-no-length"
 
 	defaultFeatureGates = map[featuregate.Feature]featuregate.FeatureSpec{
 		featureGateRange: {
@@ -50,6 +51,11 @@ var (
 			LockToDefault: false,
 			PreRelease:    featuregate.Alpha,
 		},
+		featureGateNoLength: {
+			Default:       true,
+			LockToDefault: false,
+			PreRelease:    featuregate.Alpha,
+		},
 	}
 )
 
@@ -158,6 +164,14 @@ var _ = BeforeSuite(func() {
 	}
 
 	Expect(gitCommit).To(Equal(dfgetGitCommit))
+
+	if featureGates.Enabled(featureGateRange) {
+		out, err := e2eutil.DockerCopy("/bin/", "/tmp/sha256sum-offset").CombinedOutput()
+		if err != nil {
+			fmt.Println(string(out))
+		}
+		Expect(err).NotTo(HaveOccurred())
+	}
 })
 
 // TestE2E is the root of e2e test function
diff --git a/test/e2e/e2eutil/exec.go b/test/e2e/e2eutil/exec.go
index 6114a9f6..df75c704 100644
--- a/test/e2e/e2eutil/exec.go
+++ b/test/e2e/e2eutil/exec.go
@@ -35,6 +35,13 @@ func DockerCommand(arg ...string) *exec.Cmd {
 	return exec.Command("docker", extArgs...)
 }
 
+func DockerCopy(dst, src string) *exec.Cmd {
+	container := kindDockerContainer
+	args := []string{"cp", src, fmt.Sprintf("%s:%s", container, dst)}
+	fmt.Println(fmt.Sprintf(`docker cp %s to %s:%s"`, src, container, dst))
+	return exec.Command("docker", args...)
+}
+
 func CriCtlCommand(arg ...string) *exec.Cmd {
 	extArgs := []string{"/usr/local/bin/crictl"}
 	extArgs = append(extArgs, arg...)
@@ -42,6 +49,7 @@ func CriCtlCommand(arg ...string) *exec.Cmd {
 }
 
 func KubeCtlCommand(arg ...string) *exec.Cmd {
+	fmt.Println(fmt.Sprintf(`kubectl command: "kubectl" "%s"`, strings.Join(arg, `" "`)))
 	return exec.Command("kubectl", arg...)
 }
 
diff --git a/test/testdata/charts/config.yaml b/test/testdata/charts/config.yaml
index d4475762..d4b8f8ad 100644
--- a/test/testdata/charts/config.yaml
+++ b/test/testdata/charts/config.yaml
@@ -56,6 +56,8 @@ dfdaemon:
     verbose: true
     pprofPort: 9999
     metrics: 127.0.0.1:8888
+    download:
+      prefetch: true
     scheduler:
       disableAutoBackSource: true
     proxy:
diff --git a/test/testdata/k8s/proxy.yaml b/test/testdata/k8s/proxy.yaml
index 77e7dc63..0b8eb6c0 100644
--- a/test/testdata/k8s/proxy.yaml
+++ b/test/testdata/k8s/proxy.yaml
@@ -27,6 +27,7 @@ data:
       netTopology: ""
       securityDomain: ""
     download:
+      prefetch: true
       calculateDigest: true
       downloadGRPC:
         security:
diff --git a/test/tools/sha256sum-offset/main.go b/test/tools/sha256sum-offset/main.go
new file mode 100644
index 00000000..5681ccf3
--- /dev/null
+++ b/test/tools/sha256sum-offset/main.go
@@ -0,0 +1,69 @@
+/*
+ *     Copyright 2022 The Dragonfly Authors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package main
+
+import (
+	"crypto/sha256"
+	"encoding/hex"
+	"flag"
+	"fmt"
+	"io"
+	"os"
+)
+
+var (
+	offset = flag.Int64("offset", 0, "")
+	length = flag.Int64("length", -1, "")
+	file   = flag.String("file", "", "")
+)
+
+func main() {
+	flag.Parse()
+
+	if len(*file) == 0 {
+		os.Exit(1)
+	}
+
+	f, err := os.Open(*file)
+	if err != nil {
+		panic(err)
+	}
+	defer f.Close()
+
+	if *offset > 0 {
+		_, err := f.Seek(*offset, io.SeekStart)
+		if err != nil {
+			panic(err)
+		}
+	}
+
+	var rd io.Reader = f
+	if *length > -1 {
+		rd = io.LimitReader(f, *length)
+	}
+
+	hash := sha256.New()
+	n, err := io.Copy(hash, rd)
+	if err != nil {
+		panic(err)
+	}
+
+	if *length > -1 && n != *length {
+		panic(io.ErrShortWrite)
+	}
+	fmt.Printf("%s  %s", hex.EncodeToString(hash.Sum(nil)), *file)
+}