Repository: pingcap/dumpling
Pull request #155 (2020-09-21 12:43:07)

Write directly to S3
### What problem does this PR solve? <!--add issue link with summary if exists-->
#8 Support S3

### What is changed and how it works?

Switch to using [VFS](github.com/c2fo/vfs) which supports local files, S3 and GCS. For now this only supports S3 but it should be easy to add support to e.g. GCS.

You simply prefix the output directory with "s3://bucket" e.g.:
```
dumpling -o s3://mybycket/dir
```

For now all config is passed in using the standard AWS environment variables.

### Check List <!--REMOVE the items that are not applicable-->

Tests

 - Unit test
 - Integration test
 - Manual test (add detailed scripts or steps below)
Will test by running dumpling against our staging databases.

Side effects

 - Introduces a new dependency on github.com/c2fo/vfs

Related changes

 - Need to update the documentation
 
### Release note

- support writing directly to S3


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kennytm: Hi @tirsen, thanks for the contribution! However, we're more interested in including S3 support through the [`github.com/pingcap/br/pkg/storage`](https://pkg.go.dev/github.com/pingcap/br/pkg/storage) shared by all migration tools, which we can also get GCS support for free. Could you see if it's possible to rewrite this using the ExternalStorage interface?
tirsen: It's not trivial. Afaict there is no `Writer` implementation which means I would have to implement one that buffers and then sends a chunk at a time using the `Uploader`. All doable of course but, yeah, not trivial. :-)

I could implement a `Writer` on top of `ExternalStorage` or is there one already?
tirsen: Dumpling already does some level of "buffering" itself for example [here](https://github.com/pingcap/dumpling/blob/c4e4eb0a03f2359c853d46b213c647347d9608e6/v4/export/writer_util.go#L192) but the buffer size is [hard coded to be 1mb](https://github.com/pingcap/dumpling/blob/c4e4eb0a03f2359c853d46b213c647347d9608e6/v4/export/writer_util.go#L18) which is not necessarily optimal for S3. It needs to be configurable. It would be better to implement buffering at the `github.com/pingcap/br/pkg/storage` layer so that the configuration option for chunk size is consistent across clients.
tirsen: Actually vfs isn't a good choice for this use case anyway, it buffers the entire content of a file in memory and sends all of it on close: https://github.com/C2FO/vfs/blob/master/backend/s3/file.go#L203

Or does dumpling split up tables into many smaller files? How large does individual files become if we dump say a 300gb large database?
kennytm: @tirsen 

> I could implement a `Writer` on top of `ExternalStorage` or is there one already?

Yes you could implement a `Writer` on top of `ExternalStorage`

> Dumpling already does some level of "buffering" itself for example here but the buffer size is hard coded to be 1mb which is not necessarily optimal for S3. It needs to be configurable. It would be better to implement buffering at the github.com/pingcap/br/pkg/storage layer so that the configuration option for chunk size is consistent across clients.

Yes!

> Or does dumpling split up tables into many smaller files? How large does individual files become if we dump say a 300gb large database?

If you supply `-F` or `-r`, dumpling do split up the table into smaller files according to file size or row count.
tirsen: @kennytm Here is the Writer implementation on top of Uploader: https://github.com/pingcap/br/pull/524
tirsen: Ok I think this is good to go now
lichunzhu: Nice job! We will take a look soon.
tirsen: Ok I think all comments resolved now. PHAL
kennytm: @lichunzhu using the URL `s3://bucket/path?region=us-west-2` should work.
lichunzhu: > @lichunzhu using the URL `s3://bucket/path?region=us-west-2` should work.

Yes it works. So we just ask users to set `region` in the `OutputDir` URL?
tirsen: CLI flags are now exposed
kennytm: > Is `AWS_REGION` a standard env var? 

This env var [should be used by default](https://github.com/aws/aws-sdk-go/blob/38c74caea1398949b67da14dfaa79cabe704a57f/aws/session/env_config.go#L39-L48), but unfortunately we [have overridden](https://github.com/pingcap/br/blob/master/pkg/storage/s3.go#L234) the config making all env var useless.

I think we should fix this later on BR.

Patch:
diff --git a/cmd/dumpling/main.go b/cmd/dumpling/main.go
index 78eb19d..ba07ee1 100644
--- a/cmd/dumpling/main.go
+++ b/cmd/dumpling/main.go
@@ -24,12 +24,14 @@ import (
 	"time"
 
 	"github.com/docker/go-units"
-	"github.com/pingcap/dumpling/v4/cli"
-	"github.com/pingcap/dumpling/v4/export"
-	"github.com/pingcap/dumpling/v4/log"
+	"github.com/pingcap/br/pkg/storage"
 	filter "github.com/pingcap/tidb-tools/pkg/table-filter"
 	"github.com/spf13/pflag"
 	"go.uber.org/zap"
+
+	"github.com/pingcap/dumpling/v4/cli"
+	"github.com/pingcap/dumpling/v4/export"
+	"github.com/pingcap/dumpling/v4/log"
 )
 
 var (
@@ -124,6 +126,8 @@ func main() {
 	pflag.StringVar(&outputFilenameFormat, "output-filename-template", "", "The output filename template (without file extension)")
 	pflag.BoolVar(&completeInsert, "complete-insert", false, "Use complete INSERT statements that include column names")
 
+	storage.DefineFlags(pflag.CommandLine)
+
 	printVersion := pflag.BoolP("version", "V", false, "Print Dumpling version")
 
 	pflag.Parse()
@@ -207,6 +211,12 @@ func main() {
 	conf.OutputFileTemplate = tmpl
 	conf.CompleteInsert = completeInsert
 
+	err = conf.ParseFromFlags(pflag.CommandLine)
+	if err != nil {
+		fmt.Println(err.Error())
+		os.Exit(2)
+	}
+
 	err = export.Dump(context.Background(), conf)
 	if err != nil {
 		log.Error("dump failed error stack info", zap.Error(err))
diff --git a/go.mod b/go.mod
index c8e8c29..0dc6991 100644
--- a/go.mod
+++ b/go.mod
@@ -6,24 +6,22 @@ require (
 	github.com/DATA-DOG/go-sqlmock v1.4.1
 	github.com/coreos/go-semver v0.3.0
 	github.com/docker/go-units v0.4.0
-	github.com/dustin/go-humanize v0.0.0-20180421182945-02af3965c54e // indirect
 	github.com/go-sql-driver/mysql v1.5.0
-	github.com/golang/groupcache v0.0.0-20181024230925-c65c006176ff // indirect
-	github.com/gorilla/websocket v1.2.0 // indirect
 	github.com/grpc-ecosystem/grpc-gateway v1.14.3 // indirect
 	github.com/json-iterator/go v1.1.9 // indirect
+	github.com/pingcap/br v0.0.0-20200925095602-bf9cc603382e
 	github.com/pingcap/check v0.0.0-20200212061837-5e12011dc712
-	github.com/pingcap/errors v0.11.5-0.20200820035142-66eb5bf1d1cd
+	github.com/pingcap/errors v0.11.5-0.20200902104258-eba4f1d8f6de
 	github.com/pingcap/failpoint v0.0.0-20200702092429-9f69995143ce
-	github.com/pingcap/log v0.0.0-20200511115504-543df19646ad
-	github.com/pingcap/tidb-tools v4.0.5-0.20200817064459-ba61a7376547+incompatible
+	github.com/pingcap/kvproto v0.0.0-20200910095337-6b893f12be43
+	github.com/pingcap/log v0.0.0-20200828042413-fce0951f1463
+	github.com/pingcap/tidb-tools v4.0.5-0.20200820092506-34ea90c93237+incompatible
 	github.com/pkg/errors v0.9.1
 	github.com/soheilhy/cmux v0.1.4
-	github.com/spf13/pflag v1.0.3
+	github.com/spf13/pflag v1.0.5
 	github.com/tikv/pd v1.1.0-beta.0.20200825070655-6b09f3acbb1f
-	github.com/tmc/grpc-websocket-proxy v0.0.0-20171017195756-830351dc03c6 // indirect
 	go.etcd.io/etcd v0.5.0-alpha.5.0.20191023171146-3cf2f69b5738
-	go.uber.org/zap v1.15.0
+	go.uber.org/zap v1.16.0
 	golang.org/x/net v0.0.0-20200822124328-c89045814202 // indirect
 	golang.org/x/sync v0.0.0-20200625203802-6e8e738ad208
 	golang.org/x/sys v0.0.0-20200824131525-c12d262b63d8 // indirect
@@ -32,5 +30,4 @@ require (
 	golang.org/x/xerrors v0.0.0-20200804184101-5ec99f83aff1 // indirect
 	gopkg.in/check.v1 v1.0.0-20190902080502-41f04d3bba15 // indirect
 	gopkg.in/yaml.v2 v2.3.0 // indirect
-	honnef.co/go/tools v0.0.1-2020.1.4 // indirect
 )
diff --git a/go.sum b/go.sum
index f0865a3..5613f56 100644
--- a/go.sum
+++ b/go.sum
@@ -1,58 +1,141 @@
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+cloud.google.com/go v0.44.1/go.mod h1:iSa0KzasP4Uvy3f1mN/7PiObzGgflwredwwASm/v6AU=
+cloud.google.com/go v0.44.2/go.mod h1:60680Gw3Yr4ikxnPRS/oxxkBccT6SA1yMk63TGekxKY=
+cloud.google.com/go v0.45.1/go.mod h1:RpBamKRgapWJb87xiFSdk4g1CME7QZg3uwTez+TSTjc=
+cloud.google.com/go v0.46.3/go.mod h1:a6bKKbmY7er1mI7TEI4lsAkts/mkhTSZK8w33B4RAg0=
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@@ -63,8 +146,11 @@ github.com/fatih/structtag v1.2.0/go.mod h1:mBJUNpUnHmRKrKlQQlmCrh5PuhftFbNv8Ys4
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@@ -72,10 +158,16 @@ github.com/gin-contrib/sse v0.1.0/go.mod h1:RHrZQHXnP2xjPF+u1gW/2HnVO7nvIa9PG3Gm
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@@ -89,14 +181,18 @@ github.com/go-openapi/jsonreference v0.19.3/go.mod h1:rjx6GuL8TTa9VaixXglHmQmIL9
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@@ -114,45 +210,87 @@ github.com/golang/glog v0.0.0-20160126235308-23def4e6c14b/go.mod h1:SBH7ygxi8pfU
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 google.golang.org/genproto v0.0.0-20190927181202-20e1ac93f88c h1:hrpEMCZ2O7DR5gC1n2AJGVhrwiEjOi35+jxtIuZpTMo=
 google.golang.org/genproto v0.0.0-20190927181202-20e1ac93f88c/go.mod h1:IbNlFCBrqXvoKpeg0TB2l7cyZUmoaFKYIwrEpbDKLA8=
+google.golang.org/genproto v0.0.0-20191108220845-16a3f7862a1a/go.mod h1:n3cpQtvxv34hfy77yVDNjmbRyujviMdxYliBSkLhpCc=
+google.golang.org/genproto v0.0.0-20191115194625-c23dd37a84c9/go.mod h1:n3cpQtvxv34hfy77yVDNjmbRyujviMdxYliBSkLhpCc=
+google.golang.org/genproto v0.0.0-20191216164720-4f79533eabd1/go.mod h1:n3cpQtvxv34hfy77yVDNjmbRyujviMdxYliBSkLhpCc=
+google.golang.org/genproto v0.0.0-20191230161307-f3c370f40bfb h1:ADPHZzpzM4tk4V4S5cnCrr5SwzvlrPRmqqCuJDB8UTs=
+google.golang.org/genproto v0.0.0-20191230161307-f3c370f40bfb/go.mod h1:n3cpQtvxv34hfy77yVDNjmbRyujviMdxYliBSkLhpCc=
 google.golang.org/grpc v0.0.0-20180607172857-7a6a684ca69e/go.mod h1:yo6s7OP7yaDglbqo1J04qKzAhqBH6lvTonzMVmEdcZw=
 google.golang.org/grpc v1.19.0/go.mod h1:mqu4LbDTu4XGKhr4mRzUsmM4RtVoemTSY81AxZiDr8c=
+google.golang.org/grpc v1.20.1/go.mod h1:10oTOabMzJvdu6/UiuZezV6QK5dSlG84ov/aaiqXj38=
+google.golang.org/grpc v1.21.0/go.mod h1:oYelfM1adQP15Ek0mdvEgi9Df8B9CZIaU1084ijfRaM=
+google.golang.org/grpc v1.21.1/go.mod h1:oYelfM1adQP15Ek0mdvEgi9Df8B9CZIaU1084ijfRaM=
 google.golang.org/grpc v1.23.0/go.mod h1:Y5yQAOtifL1yxbo5wqy6BxZv8vAUGQwXBOALyacEbxg=
 google.golang.org/grpc v1.23.1/go.mod h1:Y5yQAOtifL1yxbo5wqy6BxZv8vAUGQwXBOALyacEbxg=
 google.golang.org/grpc v1.24.0/go.mod h1:XDChyiUovWa60DnaeDeZmSW86xtLtjtZbwvSiRnRtcA=
 google.golang.org/grpc v1.25.1 h1:wdKvqQk7IttEw92GoRyKG2IDrUIpgpj6H6m81yfeMW0=
 google.golang.org/grpc v1.25.1/go.mod h1:c3i+UQWmh7LiEpx4sFZnkU36qjEYZ0imhYfXVyQciAY=
+google.golang.org/grpc v1.26.0 h1:2dTRdpdFEEhJYQD8EMLB61nnrzSCTbG38PhqdhvOltg=
+google.golang.org/grpc v1.26.0/go.mod h1:qbnxyOmOxrQa7FizSgH+ReBfzJrCY1pSN7KXBS8abTk=
 gopkg.in/alecthomas/gometalinter.v2 v2.0.12/go.mod h1:NDRytsqEZyolNuAgTzJkZMkSQM7FIKyzVzGhjB/qfYo=
 gopkg.in/alecthomas/kingpin.v2 v2.2.6/go.mod h1:FMv+mEhP44yOT+4EoQTLFTRgOQ1FBLkstjWtayDeSgw=
 gopkg.in/alecthomas/kingpin.v3-unstable v3.0.0-20180810215634-df19058c872c/go.mod h1:3HH7i1SgMqlzxCcBmUHW657sD4Kvv9sC3HpL3YukzwA=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/check.v1 v1.0.0-20160105164936-4f90aeace3a2/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127 h1:qIbj1fsPNlZgppZ+VLlY7N33q108Sa+fhmuc+sWQYwY=
 gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/check.v1 v1.0.0-20190902080502-41f04d3bba15 h1:YR8cESwS4TdDjEe65xsg0ogRM/Nc3DYOhEAlW+xobZo=
@@ -526,25 +1013,40 @@ gopkg.in/fsnotify.v1 v1.4.7/go.mod h1:Tz8NjZHkW78fSQdbUxIjBTcgA1z1m8ZHf0WmKUhAMy
 gopkg.in/go-playground/assert.v1 v1.2.1/go.mod h1:9RXL0bg/zibRAgZUYszZSwO/z8Y/a8bDuhia5mkpMnE=
 gopkg.in/go-playground/validator.v8 v8.18.2/go.mod h1:RX2a/7Ha8BgOhfk7j780h4/u/RRjR0eouCJSH80/M2Y=
 gopkg.in/go-playground/validator.v9 v9.29.1/go.mod h1:+c9/zcJMFNgbLvly1L1V+PpxWdVbfP1avr/N00E2vyQ=
+gopkg.in/go-playground/validator.v9 v9.31.0/go.mod h1:+c9/zcJMFNgbLvly1L1V+PpxWdVbfP1avr/N00E2vyQ=
+gopkg.in/mgo.v2 v2.0.0-20160818015218-f2b6f6c918c4/go.mod h1:yeKp02qBN3iKW1OzL3MGk2IdtZzaj7SFntXj72NppTA=
 gopkg.in/natefinch/lumberjack.v2 v2.0.0 h1:1Lc07Kr7qY4U2YPouBjpCLxpiyxIVoxqXgkXLknAOE8=
 gopkg.in/natefinch/lumberjack.v2 v2.0.0/go.mod h1:l0ndWWf7gzL7RNwBG7wST/UCcT4T24xpD6X8LsfU/+k=
 gopkg.in/resty.v1 v1.12.0/go.mod h1:mDo4pnntr5jdWRML875a/NmxYqAlA73dVijT2AXvQQo=
 gopkg.in/tomb.v1 v1.0.0-20141024135613-dd632973f1e7 h1:uRGJdciOHaEIrze2W8Q3AKkepLTh2hOroT7a+7czfdQ=
 gopkg.in/tomb.v1 v1.0.0-20141024135613-dd632973f1e7/go.mod h1:dt/ZhP58zS4L8KSrWDmTeBkI65Dw0HsyUHuEVlX15mw=
+gopkg.in/yaml.v2 v2.0.0-20170712054546-1be3d31502d6/go.mod h1:JAlM8MvJe8wmxCU4Bli9HhUf9+ttbYbLASfIpnQbh74=
 gopkg.in/yaml.v2 v2.0.0-20170812160011-eb3733d160e7/go.mod h1:JAlM8MvJe8wmxCU4Bli9HhUf9+ttbYbLASfIpnQbh74=
 gopkg.in/yaml.v2 v2.2.1/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
 gopkg.in/yaml.v2 v2.2.2 h1:ZCJp+EgiOT7lHqUV2J862kp8Qj64Jo6az82+3Td9dZw=
 gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
 gopkg.in/yaml.v2 v2.2.3/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
+gopkg.in/yaml.v2 v2.2.4/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
+gopkg.in/yaml.v2 v2.2.5/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
 gopkg.in/yaml.v2 v2.2.7/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
+gopkg.in/yaml.v2 v2.2.8/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
 gopkg.in/yaml.v2 v2.3.0 h1:clyUAQHOM3G0M3f5vQj7LuJrETvjVot3Z5el9nffUtU=
 gopkg.in/yaml.v2 v2.3.0/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
 honnef.co/go/tools v0.0.0-20190102054323-c2f93a96b099/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
+honnef.co/go/tools v0.0.0-20190106161140-3f1c8253044a/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
+honnef.co/go/tools v0.0.0-20190418001031-e561f6794a2a/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
 honnef.co/go/tools v0.0.0-20190523083050-ea95bdfd59fc/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
 honnef.co/go/tools v0.0.1-2019.2.3 h1:3JgtbtFHMiCmsznwGVTUWbgGov+pVqnlf1dEJTNAXeM=
 honnef.co/go/tools v0.0.1-2019.2.3/go.mod h1:a3bituU0lyd329TUQxRnasdCoJDkEUEAqEt0JzvZhAg=
+honnef.co/go/tools v0.0.1-2020.1.3/go.mod h1:X/FiERA/W4tHapMX5mGpAtMSVEeEUOyHaw9vFzvIQ3k=
 honnef.co/go/tools v0.0.1-2020.1.4 h1:UoveltGrhghAA7ePc+e+QYDHXrBps2PqFZiHkGR/xK8=
 honnef.co/go/tools v0.0.1-2020.1.4/go.mod h1:X/FiERA/W4tHapMX5mGpAtMSVEeEUOyHaw9vFzvIQ3k=
+honnef.co/go/tools v0.0.1-2020.1.5 h1:nI5egYTGJakVyOryqLs1cQO5dO0ksin5XXs2pspk75k=
+honnef.co/go/tools v0.0.1-2020.1.5/go.mod h1:X/FiERA/W4tHapMX5mGpAtMSVEeEUOyHaw9vFzvIQ3k=
 k8s.io/klog v1.0.0/go.mod h1:4Bi6QPql/J/LkTDqv7R/cd3hPo4k2DG6Ptcz060Ez5I=
+rsc.io/binaryregexp v0.2.0/go.mod h1:qTv7/COck+e2FymRvadv62gMdZztPaShugOCi3I+8D8=
 sigs.k8s.io/yaml v1.1.0 h1:4A07+ZFc2wgJwo8YNlQpr1rVlgUDlxXHhPJciaPY5gs=
 sigs.k8s.io/yaml v1.1.0/go.mod h1:UJmg0vDUVViEyp3mgSv9WPwZCDxu4rQW1olrI1uml+o=
+sourcegraph.com/sourcegraph/appdash v0.0.0-20180531100431-4c381bd170b4 h1:VO9oZbbkvTwqLimlQt15QNdOOBArT2dw/bvzsMZBiqQ=
+sourcegraph.com/sourcegraph/appdash v0.0.0-20180531100431-4c381bd170b4/go.mod h1:hI742Nqp5OhwiqlzhgfbWU4mW4yO10fP+LoT9WOswdU=
+sourcegraph.com/sourcegraph/appdash-data v0.0.0-20151005221446-73f23eafcf67/go.mod h1:L5q+DGLGOQFpo1snNEkLOJT2d1YTW66rWNzatr3He1k=
diff --git a/v4/export/config.go b/v4/export/config.go
index 64b5d5c..3cc26c6 100644
--- a/v4/export/config.go
+++ b/v4/export/config.go
@@ -1,6 +1,7 @@
 package export
 
 import (
+	"context"
 	"encoding/json"
 	"fmt"
 	"regexp"
@@ -9,12 +10,16 @@ import (
 	"time"
 
 	"github.com/coreos/go-semver/semver"
-	"github.com/pingcap/dumpling/v4/log"
+	"github.com/pingcap/br/pkg/storage"
 	filter "github.com/pingcap/tidb-tools/pkg/table-filter"
 	"go.uber.org/zap"
+
+	"github.com/pingcap/dumpling/v4/log"
 )
 
 type Config struct {
+	storage.BackendOptions
+
 	Databases []string
 	Host      string
 	User      string
@@ -62,6 +67,8 @@ type Config struct {
 	SessionParams      map[string]interface{}
 
 	PosAfterConnect bool
+
+	ExternalStorage storage.ExternalStorage `json:"-"`
 }
 
 func DefaultConfig() *Config {
@@ -117,6 +124,14 @@ func (conf *Config) GetDSN(db string) string {
 	return dsn
 }
 
+func (config *Config) createExternalStorage(ctx context.Context) (storage.ExternalStorage, error) {
+	b, err := storage.ParseBackend(config.OutputDirPath, &config.BackendOptions)
+	if err != nil {
+		return nil, err
+	}
+	return storage.Create(ctx, b, false)
+}
+
 const (
 	UnspecifiedSize            = 0
 	DefaultTiDBMemQuotaQuery   = 32 * (1 << 30)
diff --git a/v4/export/dump.go b/v4/export/dump.go
index 5a7d086..2490152 100755
--- a/v4/export/dump.go
+++ b/v4/export/dump.go
@@ -17,7 +17,7 @@ import (
 )
 
 func Dump(pCtx context.Context, conf *Config) (err error) {
-	if err = adjustConfig(conf); err != nil {
+	if err = adjustConfig(pCtx, conf); err != nil {
 		return withStack(err)
 	}
 
@@ -114,9 +114,9 @@ func Dump(pCtx context.Context, conf *Config) (err error) {
 		defer newPool.Close()
 	}
 
-	m := newGlobalMetadata(conf.OutputDirPath)
+	m := newGlobalMetadata(conf.ExternalStorage)
 	// write metadata even if dump failed
-	defer m.writeGlobalMetaData()
+	defer m.writeGlobalMetaData(ctx)
 
 	// for consistency lock, we should lock tables at first to get the tables we want to lock & dump
 	// for consistency lock, record meta pos before lock tables because other tables may still be modified while locking tables
diff --git a/v4/export/metadata.go b/v4/export/metadata.go
index a0eadc2..9d41e49 100644
--- a/v4/export/metadata.go
+++ b/v4/export/metadata.go
@@ -6,15 +6,16 @@ import (
 	"database/sql"
 	"errors"
 	"fmt"
-	"path"
 	"strings"
 	"time"
+
+	"github.com/pingcap/br/pkg/storage"
 )
 
 type globalMetadata struct {
 	buffer bytes.Buffer
 
-	filePath string
+	storage storage.ExternalStorage
 }
 
 const (
@@ -28,10 +29,10 @@ const (
 	mariadbShowMasterStatusFieldNum = 4
 )
 
-func newGlobalMetadata(outputDir string) *globalMetadata {
+func newGlobalMetadata(s storage.ExternalStorage) *globalMetadata {
 	return &globalMetadata{
-		filePath: path.Join(outputDir, metadataPath),
-		buffer:   bytes.Buffer{},
+		storage: s,
+		buffer:  bytes.Buffer{},
 	}
 }
 
@@ -189,12 +190,12 @@ func (m *globalMetadata) recordGlobalMetaData(db *sql.Conn, serverType ServerTyp
 	})
 }
 
-func (m *globalMetadata) writeGlobalMetaData() error {
-	fileWriter, tearDown, err := buildFileWriter(m.filePath)
+func (m *globalMetadata) writeGlobalMetaData(ctx context.Context) error {
+	fileWriter, tearDown, err := buildFileWriter(ctx, m.storage, metadataPath)
 	if err != nil {
 		return err
 	}
-	defer tearDown()
+	defer tearDown(ctx)
 
-	return write(fileWriter, m.String())
+	return write(ctx, fileWriter, m.String())
 }
diff --git a/v4/export/prepare.go b/v4/export/prepare.go
index 9326f22..f71976e 100644
--- a/v4/export/prepare.go
+++ b/v4/export/prepare.go
@@ -1,6 +1,7 @@
 package export
 
 import (
+	"context"
 	"database/sql"
 	"fmt"
 	"regexp"
@@ -70,7 +71,7 @@ func ParseOutputFileTemplate(text string) (*template.Template, error) {
 	return template.Must(DefaultOutputFileTemplate.Clone()).Parse(text)
 }
 
-func adjustConfig(conf *Config) error {
+func adjustConfig(ctx context.Context, conf *Config) error {
 	// Init logger
 	if conf.Logger != nil {
 		log.SetAppLogger(conf.Logger)
@@ -111,6 +112,12 @@ func adjustConfig(conf *Config) error {
 		return errors.New("can't specify both --sql and --where at the same time. Please try to combine them into --sql")
 	}
 
+	s, err := conf.createExternalStorage(ctx)
+	if err != nil {
+		return err
+	}
+	conf.ExternalStorage = s
+
 	return nil
 }
 
diff --git a/v4/export/writer.go b/v4/export/writer.go
index 9bcaee4..1ac5b77 100644
--- a/v4/export/writer.go
+++ b/v4/export/writer.go
@@ -3,10 +3,9 @@ package export
 import (
 	"bytes"
 	"context"
-	"os"
-	"path"
 	"text/template"
 
+	"github.com/pingcap/br/pkg/storage"
 	"go.uber.org/zap"
 
 	"github.com/pingcap/dumpling/v4/log"
@@ -24,7 +23,7 @@ type SimpleWriter struct {
 
 func NewSimpleWriter(config *Config) (SimpleWriter, error) {
 	sw := SimpleWriter{cfg: config}
-	return sw, os.MkdirAll(config.OutputDirPath, 0755)
+	return sw, nil
 }
 
 func (f SimpleWriter) WriteDatabaseMeta(ctx context.Context, db, createSQL string) error {
@@ -32,8 +31,7 @@ func (f SimpleWriter) WriteDatabaseMeta(ctx context.Context, db, createSQL strin
 	if err != nil {
 		return err
 	}
-	filePath := path.Join(f.cfg.OutputDirPath, fileName+".sql")
-	return writeMetaToFile(db, createSQL, filePath)
+	return writeMetaToFile(ctx, db, createSQL, f.cfg.ExternalStorage, fileName+".sql")
 }
 
 func (f SimpleWriter) WriteTableMeta(ctx context.Context, db, table, createSQL string) error {
@@ -41,8 +39,7 @@ func (f SimpleWriter) WriteTableMeta(ctx context.Context, db, table, createSQL s
 	if err != nil {
 		return err
 	}
-	filePath := path.Join(f.cfg.OutputDirPath, fileName+".sql")
-	return writeMetaToFile(db, createSQL, filePath)
+	return writeMetaToFile(ctx, db, createSQL, f.cfg.ExternalStorage, fileName+".sql")
 }
 
 type SQLWriter struct{ SimpleWriter }
@@ -68,10 +65,9 @@ func (f SQLWriter) WriteTableData(ctx context.Context, ir TableDataIR) error {
 	defer chunksIter.Rows().Close()
 
 	for {
-		filePath := path.Join(f.cfg.OutputDirPath, fileName)
-		fileWriter, tearDown := buildInterceptFileWriter(filePath)
-		err := WriteInsert(ctx, chunksIter, fileWriter, f.cfg.FileSize, f.cfg.StatementSize)
-		tearDown()
+		fileWriter, tearDown := buildInterceptFileWriter(f.cfg.ExternalStorage, fileName)
+		err = WriteInsert(ctx, chunksIter, fileWriter, f.cfg.FileSize, f.cfg.StatementSize)
+		tearDown(ctx)
 		if err != nil {
 			return err
 		}
@@ -94,14 +90,14 @@ func (f SQLWriter) WriteTableData(ctx context.Context, ir TableDataIR) error {
 	return nil
 }
 
-func writeMetaToFile(target, metaSQL, path string) error {
-	fileWriter, tearDown, err := buildFileWriter(path)
+func writeMetaToFile(ctx context.Context, target, metaSQL string, s storage.ExternalStorage, path string) error {
+	fileWriter, tearDown, err := buildFileWriter(ctx, s, path)
 	if err != nil {
 		return err
 	}
-	defer tearDown()
+	defer tearDown(ctx)
 
-	return WriteMeta(&metaData{
+	return WriteMeta(ctx, &metaData{
 		target:  target,
 		metaSQL: metaSQL,
 	}, fileWriter)
@@ -162,10 +158,9 @@ func (f CSVWriter) WriteTableData(ctx context.Context, ir TableDataIR) error {
 	}
 
 	for {
-		filePath := path.Join(f.cfg.OutputDirPath, fileName)
-		fileWriter, tearDown := buildInterceptFileWriter(filePath)
-		err := WriteInsertInCsv(ctx, chunksIter, fileWriter, f.cfg.NoHeader, opt, f.cfg.FileSize)
-		tearDown()
+		fileWriter, tearDown := buildInterceptFileWriter(f.cfg.ExternalStorage, fileName)
+		err = WriteInsertInCsv(ctx, chunksIter, fileWriter, f.cfg.NoHeader, opt, f.cfg.FileSize)
+		tearDown(ctx)
 		if err != nil {
 			return err
 		}
diff --git a/v4/export/writer_util.go b/v4/export/writer_util.go
index a27f435..03fe419 100644
--- a/v4/export/writer_util.go
+++ b/v4/export/writer_util.go
@@ -1,21 +1,25 @@
 package export
 
 import (
-	"bufio"
 	"bytes"
 	"context"
 	"fmt"
 	"io"
-	"os"
 	"strings"
 	"sync"
 
-	"github.com/pingcap/dumpling/v4/log"
 	"go.uber.org/zap"
+
+	"github.com/pingcap/br/pkg/storage"
+
+	"github.com/pingcap/dumpling/v4/log"
 )
 
 const lengthLimit = 1048576
 
+// TODO make this configurable, 5 mb is a good minimum size but on low latency/high bandwidth network you can go a lot bigger
+const hardcodedS3ChunkSize = 5 * 1024 * 1024
+
 var pool = sync.Pool{New: func() interface{} {
 	return &bytes.Buffer{}
 }}
@@ -31,10 +35,10 @@ type writerPipe struct {
 	fileSizeLimit      uint64
 	statementSizeLimit uint64
 
-	w io.Writer
+	w storage.Writer
 }
 
-func newWriterPipe(w io.Writer, fileSizeLimit, statementSizeLimit uint64) *writerPipe {
+func newWriterPipe(w storage.Writer, fileSizeLimit, statementSizeLimit uint64) *writerPipe {
 	return &writerPipe{
 		input:  make(chan *bytes.Buffer, 8),
 		closed: make(chan struct{}),
@@ -60,7 +64,7 @@ func (b *writerPipe) Run(ctx context.Context) {
 			if errOccurs {
 				continue
 			}
-			err := writeBytes(b.w, s.Bytes())
+			err := writeBytes(ctx, b.w, s.Bytes())
 			s.Reset()
 			pool.Put(s)
 			if err != nil {
@@ -96,17 +100,17 @@ func (b *writerPipe) ShouldSwitchStatement() bool {
 		(b.statementSizeLimit != UnspecifiedSize && b.currentStatementSize >= b.statementSizeLimit)
 }
 
-func WriteMeta(meta MetaIR, w io.StringWriter) error {
+func WriteMeta(ctx context.Context, meta MetaIR, w storage.Writer) error {
 	log.Debug("start dumping meta data", zap.String("target", meta.TargetName()))
 
 	specCmtIter := meta.SpecialComments()
 	for specCmtIter.HasNext() {
-		if err := write(w, fmt.Sprintf("%s\n", specCmtIter.Next())); err != nil {
+		if err := write(ctx, w, fmt.Sprintf("%s\n", specCmtIter.Next())); err != nil {
 			return err
 		}
 	}
 
-	if err := write(w, fmt.Sprintf("%s;\n", meta.MetaSQL())); err != nil {
+	if err := write(ctx, w, fmt.Sprintf("%s;\n", meta.MetaSQL())); err != nil {
 		return err
 	}
 
@@ -114,7 +118,7 @@ func WriteMeta(meta MetaIR, w io.StringWriter) error {
 	return nil
 }
 
-func WriteInsert(pCtx context.Context, tblIR TableDataIR, w io.Writer, fileSizeLimit, statementSizeLimit uint64) error {
+func WriteInsert(pCtx context.Context, tblIR TableDataIR, w storage.Writer, fileSizeLimit, statementSizeLimit uint64) error {
 	fileRowIter := tblIR.Rows()
 	if !fileRowIter.HasNext() {
 		return nil
@@ -226,7 +230,7 @@ func WriteInsert(pCtx context.Context, tblIR TableDataIR, w io.Writer, fileSizeL
 	return wp.Error()
 }
 
-func WriteInsertInCsv(pCtx context.Context, tblIR TableDataIR, w io.Writer, noHeader bool, opt *csvOption, fileSizeLimit uint64) error {
+func WriteInsertInCsv(pCtx context.Context, tblIR TableDataIR, w storage.Writer, noHeader bool, opt *csvOption, fileSizeLimit uint64) error {
 	fileRowIter := tblIR.Rows()
 	if !fileRowIter.HasNext() {
 		return nil
@@ -318,8 +322,8 @@ func WriteInsertInCsv(pCtx context.Context, tblIR TableDataIR, w io.Writer, noHe
 	return wp.Error()
 }
 
-func write(writer io.StringWriter, str string) error {
-	_, err := writer.WriteString(str)
+func write(ctx context.Context, writer storage.Writer, str string) error {
+	_, err := writer.Write(ctx, []byte(str))
 	if err != nil {
 		// str might be very long, only output the first 200 chars
 		outputLength := len(str)
@@ -333,8 +337,8 @@ func write(writer io.StringWriter, str string) error {
 	return err
 }
 
-func writeBytes(writer io.Writer, p []byte) error {
-	_, err := writer.Write(p)
+func writeBytes(ctx context.Context, writer storage.Writer, p []byte) error {
+	_, err := writer.Write(ctx, p)
 	if err != nil {
 		// str might be very long, only output the first 200 chars
 		outputLength := len(p)
@@ -343,61 +347,64 @@ func writeBytes(writer io.Writer, p []byte) error {
 		}
 		log.Error("writing failed",
 			zap.ByteString("string", p[:outputLength]),
+			zap.String("writer", fmt.Sprintf("%#v", writer)),
 			zap.Error(err))
 	}
 	return err
 }
 
-func buildFileWriter(path string) (io.StringWriter, func(), error) {
-	file, err := os.OpenFile(path, os.O_CREATE|os.O_WRONLY|os.O_TRUNC, 0755)
+func buildFileWriter(ctx context.Context, s storage.ExternalStorage, path string) (storage.Writer, func(ctx context.Context), error) {
+	fullPath := s.URI() + path
+	uploader, err := s.CreateUploader(ctx, path)
 	if err != nil {
 		log.Error("open file failed",
-			zap.String("path", path),
+			zap.String("path", fullPath),
 			zap.Error(err))
 		return nil, nil, err
 	}
-	log.Debug("opened file", zap.String("path", path))
-	buf := bufio.NewWriter(file)
-	tearDownRoutine := func() {
-		_ = buf.Flush()
-		err := file.Close()
+	writer := storage.NewUploaderWriter(uploader, hardcodedS3ChunkSize)
+	log.Debug("opened file", zap.String("path", fullPath))
+	tearDownRoutine := func(ctx context.Context) {
+		err := writer.Close(ctx)
 		if err == nil {
 			return
 		}
 		log.Error("close file failed",
-			zap.String("path", path),
+			zap.String("path", fullPath),
 			zap.Error(err))
 	}
-	return buf, tearDownRoutine, nil
+	return writer, tearDownRoutine, nil
 }
 
-func buildInterceptFileWriter(path string) (io.Writer, func()) {
-	var file *os.File
+func buildInterceptFileWriter(s storage.ExternalStorage, path string) (storage.Writer, func(context.Context)) {
+	var writer storage.Writer
+	fullPath := s.URI() + path
 	fileWriter := &InterceptFileWriter{}
-	initRoutine := func() error {
-		f, err := os.OpenFile(path, os.O_CREATE|os.O_WRONLY|os.O_TRUNC, 0755)
-		file = f
+	initRoutine := func(ctx context.Context) error {
+		uploader, err := s.CreateUploader(ctx, path)
 		if err != nil {
 			log.Error("open file failed",
-				zap.String("path", path),
+				zap.String("path", fullPath),
 				zap.Error(err))
+			return err
 		}
-		log.Debug("opened file", zap.String("path", path))
-		fileWriter.Writer = file
+		w := storage.NewUploaderWriter(uploader, hardcodedS3ChunkSize)
+		writer = w
+		log.Debug("opened file", zap.String("path", fullPath))
+		fileWriter.Writer = writer
 		return err
 	}
 	fileWriter.initRoutine = initRoutine
 
-	tearDownRoutine := func() {
-		if file == nil {
+	tearDownRoutine := func(ctx context.Context) {
+		if writer == nil {
 			return
 		}
 		log.Debug("tear down lazy file writer...")
-		err := file.Close()
-		if err == nil {
-			return
+		err := writer.Close(ctx)
+		if err != nil {
+			log.Error("close file failed", zap.String("path", fullPath))
 		}
-		log.Error("close file failed", zap.String("path", path))
 	}
 	return fileWriter, tearDownRoutine
 }
@@ -420,23 +427,27 @@ func (l *LazyStringWriter) WriteString(str string) (int, error) {
 // InterceptFileWriter is an interceptor of os.File,
 // tracking whether a StringWriter has written something.
 type InterceptFileWriter struct {
-	io.Writer
+	storage.Writer
 	sync.Once
-	initRoutine func() error
+	initRoutine func(context.Context) error
 	err         error
 
 	SomethingIsWritten bool
 }
 
-func (w *InterceptFileWriter) Write(p []byte) (int, error) {
-	w.Do(func() { w.err = w.initRoutine() })
+func (w *InterceptFileWriter) Write(ctx context.Context, p []byte) (int, error) {
+	w.Do(func() { w.err = w.initRoutine(ctx) })
 	if len(p) > 0 {
 		w.SomethingIsWritten = true
 	}
 	if w.err != nil {
 		return 0, fmt.Errorf("open file error: %s", w.err.Error())
 	}
-	return w.Writer.Write(p)
+	return w.Writer.Write(ctx, p)
+}
+
+func (w *InterceptFileWriter) Close(ctx context.Context) error {
+	return w.Writer.Close(ctx)
 }
 
 func wrapBackTicks(identifier string) string {


Test patch:
diff --git a/tests/_utils/run_dumpling b/tests/_utils/run_dumpling
index ca574a5..1eecff0 100755
--- a/tests/_utils/run_dumpling
+++ b/tests/_utils/run_dumpling
@@ -3,6 +3,7 @@
 set -e
 
 echo "[$(date)] Executing bin/dumpling..."
+echo "$DUMPLING_OUTPUT_DIR"
 
 bin/dumpling -u "$DUMPLING_TEST_USER" -h 127.0.0.1 \
     -P "$DUMPLING_TEST_PORT" -B "$DUMPLING_TEST_DATABASE" \
diff --git a/tests/s3/run.sh b/tests/s3/run.sh
new file mode 100755
index 0000000..83d519d
--- /dev/null
+++ b/tests/s3/run.sh
@@ -0,0 +1,52 @@
+#!/bin/sh
+
+set -eux
+
+echo "starting localstack writing to ${DUMPLING_OUTPUT_DIR}"
+mkdir -p "${DUMPLING_OUTPUT_DIR}"
+ls "${DUMPLING_OUTPUT_DIR}"
+docker run --name dumpling_test_s3 -d \
+  -p 5000:5000 \
+  motoserver/moto
+sleep 1 # wait for motoserver to start up
+cleanup() {
+  echo "Stopping motoserver"
+  docker rm -f dumpling_test_s3
+}
+trap cleanup EXIT
+
+awslocal() {
+  docker run --rm --net=host -it -e PAGER=cat -e AWS_ACCESS_KEY_ID=foo -e AWS_SECRET_ACCESS_KEY=foo amazon/aws-cli --endpoint http://localhost:5000 "$@"
+}
+awslocal s3api create-bucket --bucket mybucket
+
+DB_NAME="s3"
+TABLE_NAME="t"
+
+# drop database on mysql
+run_sql "drop database if exists \`$DB_NAME\`;"
+
+# build data on mysql
+run_sql "create database $DB_NAME;"
+run_sql "create table $DB_NAME.$TABLE_NAME (a int(255));"
+
+# insert 100 records
+run_sql "insert into $DB_NAME.$TABLE_NAME values $(seq -s, 100 | sed 's/,*$//g' | sed "s/[0-9]*/('1')/g");"
+
+# run dumpling!
+HOST_DIR=${DUMPLING_OUTPUT_DIR}
+export DUMPLING_OUTPUT_DIR=s3://mybucket/dump
+export DUMPLING_TEST_DATABASE=$DB_NAME
+export AWS_REGION=us-east-1
+export AWS_ACCESS_KEY_ID=testid
+export AWS_SECRET_ACCESS_KEY=testkey
+run_dumpling --s3.endpoint=http://localhost:5000
+ls "${HOST_DIR}"
+
+curl -o "${HOST_DIR}/s3-schema-create.sql" http://localhost:5000/mybucket/dump/s3-schema-create.sql
+curl -o "${HOST_DIR}/s3.t-schema.sql" http://localhost:5000/mybucket/dump/s3.t-schema.sql
+curl -o "${HOST_DIR}/s3.t.0.sql" http://localhost:5000/mybucket/dump/s3.t.0.sql
+
+file_should_exist "$HOST_DIR/s3-schema-create.sql"
+file_should_exist "$HOST_DIR/s3.t-schema.sql"
+file_should_exist "$HOST_DIR/s3.t.0.sql"
diff --git a/v4/export/config_test.go b/v4/export/config_test.go
new file mode 100644
index 0000000..14caf64
--- /dev/null
+++ b/v4/export/config_test.go
@@ -0,0 +1,18 @@
+package export
+
+import (
+	"context"
+
+	. "github.com/pingcap/check"
+)
+
+var _ = Suite(&testConfigSuite{})
+
+type testConfigSuite struct{}
+
+func (s *testConfigSuite) TestCreateExternalStorage(c *C) {
+	mockConfig := DefaultConfig()
+	loc, err := mockConfig.createExternalStorage(context.Background())
+	c.Assert(err, IsNil)
+	c.Assert(loc.URI(), Matches, "file:.*")
+}
diff --git a/v4/export/metadata_test.go b/v4/export/metadata_test.go
index cf11e83..13b0eb3 100644
--- a/v4/export/metadata_test.go
+++ b/v4/export/metadata_test.go
@@ -3,9 +3,9 @@ package export
 import (
 	"context"
 	"fmt"
-	"path"
 
 	"github.com/DATA-DOG/go-sqlmock"
+	"github.com/pingcap/br/pkg/storage"
 	. "github.com/pingcap/check"
 )
 
@@ -30,10 +30,8 @@ func (s *testMetaDataSuite) TestMysqlMetaData(c *C) {
 	mock.ExpectQuery("SHOW SLAVE STATUS").WillReturnRows(
 		sqlmock.NewRows([]string{"exec_master_log_pos", "relay_master_log_file", "master_host", "Executed_Gtid_Set", "Seconds_Behind_Master"}))
 
-	testFilePath := "/test"
-	m := newGlobalMetadata(testFilePath)
+	m := newGlobalMetadata(s.createStorage(c))
 	c.Assert(m.recordGlobalMetaData(conn, ServerTypeMySQL, false), IsNil)
-	c.Assert(m.filePath, Equals, path.Join(testFilePath, metadataPath))
 
 	c.Assert(m.buffer.String(), Equals, "SHOW MASTER STATUS:\n"+
 		"\tLog: ON.000001\n"+
@@ -42,6 +40,13 @@ func (s *testMetaDataSuite) TestMysqlMetaData(c *C) {
 	c.Assert(mock.ExpectationsWereMet(), IsNil)
 }
 
+func (s *testMetaDataSuite) createStorage(c *C) storage.ExternalStorage {
+	backend, err := storage.ParseBackend("file:///"+c.MkDir(), nil)
+	c.Assert(err, IsNil)
+	testLoc, _ := storage.Create(context.Background(), backend, true)
+	return testLoc
+}
+
 func (s *testMetaDataSuite) TestMetaDataAfterConn(c *C) {
 	db, mock, err := sqlmock.New()
 	c.Assert(err, IsNil)
@@ -63,11 +68,9 @@ func (s *testMetaDataSuite) TestMetaDataAfterConn(c *C) {
 		sqlmock.NewRows([]string{"exec_master_log_pos", "relay_master_log_file", "master_host", "Executed_Gtid_Set", "Seconds_Behind_Master"}))
 	mock.ExpectQuery("SHOW MASTER STATUS").WillReturnRows(rows2)
 
-	testFilePath := "/test"
-	m := newGlobalMetadata(testFilePath)
+	m := newGlobalMetadata(s.createStorage(c))
 	c.Assert(m.recordGlobalMetaData(conn, ServerTypeMySQL, false), IsNil)
 	c.Assert(m.recordGlobalMetaData(conn, ServerTypeMySQL, true), IsNil)
-	c.Assert(m.filePath, Equals, path.Join(testFilePath, metadataPath))
 
 	c.Assert(m.buffer.String(), Equals, "SHOW MASTER STATUS:\n"+
 		"\tLog: ON.000001\n"+
@@ -98,10 +101,8 @@ func (s *testMetaDataSuite) TestMysqlWithFollowersMetaData(c *C) {
 	mock.ExpectQuery("SELECT @@default_master_connection").WillReturnError(fmt.Errorf("mock error"))
 	mock.ExpectQuery("SHOW SLAVE STATUS").WillReturnRows(followerRows)
 
-	testFilePath := "/test"
-	m := newGlobalMetadata(testFilePath)
+	m := newGlobalMetadata(s.createStorage(c))
 	c.Assert(m.recordGlobalMetaData(conn, ServerTypeMySQL, false), IsNil)
-	c.Assert(m.filePath, Equals, path.Join(testFilePath, metadataPath))
 
 	c.Assert(m.buffer.String(), Equals, "SHOW MASTER STATUS:\n"+
 		"\tLog: ON.000001\n"+
@@ -131,10 +132,8 @@ func (s *testMetaDataSuite) TestMysqlWithNullFollowersMetaData(c *C) {
 	mock.ExpectQuery("SELECT @@default_master_connection").WillReturnError(fmt.Errorf("mock error"))
 	mock.ExpectQuery("SHOW SLAVE STATUS").WillReturnRows(sqlmock.NewRows([]string{"SQL_Remaining_Delay"}).AddRow(nil))
 
-	testFilePath := "/test"
-	m := newGlobalMetadata(testFilePath)
+	m := newGlobalMetadata(s.createStorage(c))
 	c.Assert(m.recordGlobalMetaData(conn, ServerTypeMySQL, false), IsNil)
-	c.Assert(m.filePath, Equals, path.Join(testFilePath, metadataPath))
 
 	c.Assert(m.buffer.String(), Equals, "SHOW MASTER STATUS:\n"+
 		"\tLog: ON.000001\n"+
@@ -160,10 +159,8 @@ func (s *testMetaDataSuite) TestMariaDBMetaData(c *C) {
 		AddRow(gtidSet)
 	mock.ExpectQuery("SELECT @@global.gtid_binlog_pos").WillReturnRows(rows)
 	mock.ExpectQuery("SHOW SLAVE STATUS").WillReturnRows(rows)
-	testFilePath := "/test"
-	m := newGlobalMetadata(testFilePath)
+	m := newGlobalMetadata(s.createStorage(c))
 	c.Assert(m.recordGlobalMetaData(conn, ServerTypeMariaDB, false), IsNil)
-	c.Assert(m.filePath, Equals, path.Join(testFilePath, metadataPath))
 
 	c.Assert(mock.ExpectationsWereMet(), IsNil)
 }
@@ -189,10 +186,8 @@ func (s *testMetaDataSuite) TestMariaDBWithFollowersMetaData(c *C) {
 			AddRow("connection_1"))
 	mock.ExpectQuery("SHOW ALL SLAVES STATUS").WillReturnRows(followerRows)
 
-	testFilePath := "/test"
-	m := newGlobalMetadata(testFilePath)
+	m := newGlobalMetadata(s.createStorage(c))
 	c.Assert(m.recordGlobalMetaData(conn, ServerTypeMySQL, false), IsNil)
-	c.Assert(m.filePath, Equals, path.Join(testFilePath, metadataPath))
 
 	c.Assert(m.buffer.String(), Equals, "SHOW MASTER STATUS:\n"+
 		"\tLog: ON.000001\n"+
diff --git a/v4/export/prepare_test.go b/v4/export/prepare_test.go
index 55f5f09..ff82d36 100644
--- a/v4/export/prepare_test.go
+++ b/v4/export/prepare_test.go
@@ -114,12 +114,12 @@ func (s *testPrepareSuite) TestAdjustConfig(c *C) {
 	conf := DefaultConfig()
 	conf.Where = "id < 5"
 	conf.Sql = "select * from t where id > 3"
-	c.Assert(adjustConfig(conf), ErrorMatches, "can't specify both --sql and --where at the same time. Please try to combine them into --sql")
+	c.Assert(adjustConfig(nil, conf), ErrorMatches, "can't specify both --sql and --where at the same time. Please try to combine them into --sql")
 	conf.Where = ""
-	c.Assert(adjustConfig(conf), IsNil)
+	c.Assert(adjustConfig(nil, conf), IsNil)
 	conf.Sql = ""
 	conf.Rows = 5000
 	conf.FileSize = uint64(5000)
-	c.Assert(adjustConfig(conf), IsNil)
+	c.Assert(adjustConfig(nil, conf), IsNil)
 	c.Assert(conf.FileSize, Equals, uint64(UnspecifiedSize))
 }
diff --git a/v4/export/test_util.go b/v4/export/test_util.go
index 81791f8..58813c7 100644
--- a/v4/export/test_util.go
+++ b/v4/export/test_util.go
@@ -9,11 +9,12 @@ import (
 	"github.com/DATA-DOG/go-sqlmock"
 )
 
-type mockStringWriter struct {
+type mockPoisonWriter struct {
 	buf string
 }
 
-func (m *mockStringWriter) WriteString(s string) (int, error) {
+func (m *mockPoisonWriter) Write(ctx context.Context, p []byte) (int, error) {
+	s := string(p)
 	if s == "poison" {
 		return 0, fmt.Errorf("poison_error")
 	}
@@ -21,13 +22,9 @@ func (m *mockStringWriter) WriteString(s string) (int, error) {
 	return len(s), nil
 }
 
-type mockStringCollector struct {
-	buf string
-}
-
-func (m *mockStringCollector) WriteString(s string) (int, error) {
-	m.buf += s
-	return len(s), nil
+func (m *mockPoisonWriter) Close(ctx context.Context) error {
+	// noop
+	return nil
 }
 
 type mockSQLRowIterator struct {
diff --git a/v4/export/writer_test.go b/v4/export/writer_test.go
index 03ffd81..859d50d 100644
--- a/v4/export/writer_test.go
+++ b/v4/export/writer_test.go
@@ -3,7 +3,6 @@ package export
 import (
 	"context"
 	"database/sql/driver"
-	"fmt"
 	"io/ioutil"
 	"os"
 	"path"
@@ -20,9 +19,12 @@ func (s *testDumpSuite) TestWriteDatabaseMeta(c *C) {
 	c.Assert(err, IsNil)
 	defer os.RemoveAll(dir)
 
+	ctx := context.Background()
+
 	config := DefaultConfig()
 	config.OutputDirPath = dir
-	ctx := context.Background()
+	err = adjustConfig(ctx, config)
+	c.Assert(err, IsNil)
 
 	writer, err := NewSimpleWriter(config)
 	c.Assert(err, IsNil)
@@ -41,9 +43,11 @@ func (s *testDumpSuite) TestWriteTableMeta(c *C) {
 	c.Assert(err, IsNil)
 	defer os.RemoveAll(dir)
 
+	ctx := context.Background()
+
 	config := DefaultConfig()
 	config.OutputDirPath = dir
-	ctx := context.Background()
+	err = adjustConfig(ctx, config)
 
 	writer, err := NewSimpleWriter(config)
 	c.Assert(err, IsNil)
@@ -62,9 +66,11 @@ func (s *testDumpSuite) TestWriteTableData(c *C) {
 	c.Assert(err, IsNil)
 	defer os.RemoveAll(dir)
 
+	ctx := context.Background()
+
 	config := DefaultConfig()
 	config.OutputDirPath = dir
-	ctx := context.Background()
+	err = adjustConfig(ctx, config)
 
 	simpleWriter, err := NewSimpleWriter(config)
 	c.Assert(err, IsNil)
@@ -106,10 +112,12 @@ func (s *testDumpSuite) TestWriteTableDataWithFileSize(c *C) {
 	c.Assert(err, IsNil)
 	defer os.RemoveAll(dir)
 
+	ctx := context.Background()
+
 	config := DefaultConfig()
 	config.OutputDirPath = dir
 	config.FileSize = 50
-	ctx := context.Background()
+	err = adjustConfig(ctx, config)
 	specCmts := []string{
 		"/*!40101 SET NAMES binary*/;",
 		"/*!40014 SET FOREIGN_KEY_CHECKS=0*/;",
@@ -160,13 +168,15 @@ func (s *testDumpSuite) TestWriteTableDataWithStatementSize(c *C) {
 	dir, err := ioutil.TempDir("", "dumpling")
 	c.Assert(err, IsNil)
 
+	ctx := context.Background()
+
 	config := DefaultConfig()
 	config.OutputDirPath = dir
 	config.StatementSize = 50
 	config.StatementSize += uint64(len("INSERT INTO `employee` VALUES\n"))
 	config.OutputFileTemplate, err = ParseOutputFileTemplate("specified-name")
+	err = adjustConfig(ctx, config)
 	c.Assert(err, IsNil)
-	ctx := context.Background()
 	defer os.RemoveAll(config.OutputDirPath)
 
 	simpleWriter, err := NewSimpleWriter(config)
@@ -220,8 +230,9 @@ func (s *testDumpSuite) TestWriteTableDataWithStatementSize(c *C) {
 	c.Assert(err, IsNil)
 	os.RemoveAll(config.OutputDirPath)
 	config.OutputDirPath, err = ioutil.TempDir("", "dumpling")
-	fmt.Println(config.OutputDirPath)
+	newStorage, err := config.createExternalStorage(context.Background())
 	c.Assert(err, IsNil)
+	config.ExternalStorage = newStorage
 
 	cases = map[string]string{
 		"0-employee-te%25%2Fst.sql": "/*!40101 SET NAMES binary*/;\n" +
diff --git a/v4/export/writer_util_test.go b/v4/export/writer_util_test.go
index 927819f..24473a2 100644
--- a/v4/export/writer_util_test.go
+++ b/v4/export/writer_util_test.go
@@ -1,7 +1,6 @@
 package export
 
 import (
-	"bytes"
 	"context"
 	"errors"
 	"fmt"
@@ -10,6 +9,7 @@ import (
 
 	"database/sql/driver"
 
+	"github.com/pingcap/br/pkg/storage"
 	. "github.com/pingcap/check"
 )
 
@@ -35,15 +35,15 @@ func (s *testUtilSuite) TestWriteMeta(c *C) {
 		") ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci"
 	specCmts := []string{"/*!40103 SET TIME_ZONE='+00:00' */;"}
 	meta := newMockMetaIR("t1", createTableStmt, specCmts)
-	strCollector := &mockStringCollector{}
+	writer := storage.NewBufferWriter()
 
-	err := WriteMeta(meta, strCollector)
+	err := WriteMeta(context.Background(), meta, writer)
 	c.Assert(err, IsNil)
 	expected := "/*!40103 SET TIME_ZONE='+00:00' */;\n" +
 		"CREATE TABLE `t1` (\n" +
 		"  `a` int(11) DEFAULT NULL\n" +
 		") ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci;\n"
-	c.Assert(strCollector.buf, Equals, expected)
+	c.Assert(writer.String(), Equals, expected)
 }
 
 func (s *testUtilSuite) TestWriteInsert(c *C) {
@@ -59,7 +59,7 @@ func (s *testUtilSuite) TestWriteInsert(c *C) {
 		"/*!40014 SET FOREIGN_KEY_CHECKS=0*/;",
 	}
 	tableIR := newMockTableIR("test", "employee", data, specCmts, colTypes)
-	bf := &bytes.Buffer{}
+	bf := storage.NewBufferWriter()
 
 	err := WriteInsert(context.Background(), tableIR, bf, UnspecifiedSize, UnspecifiedSize)
 	c.Assert(err, IsNil)
@@ -89,7 +89,7 @@ func (s *testUtilSuite) TestWriteInsertReturnsError(c *C) {
 	rowErr := errors.New("mock row error")
 	tableIR := newMockTableIR("test", "employee", data, specCmts, colTypes)
 	tableIR.rowErr = rowErr
-	bf := &bytes.Buffer{}
+	bf := storage.NewBufferWriter()
 
 	err := WriteInsert(context.Background(), tableIR, bf, UnspecifiedSize, UnspecifiedSize)
 	c.Assert(err, Equals, rowErr)
@@ -111,7 +111,7 @@ func (s *testUtilSuite) TestWriteInsertInCsv(c *C) {
 	}
 	colTypes := []string{"INT", "SET", "VARCHAR", "VARCHAR", "TEXT"}
 	tableIR := newMockTableIR("test", "employee", data, nil, colTypes)
-	bf := &bytes.Buffer{}
+	bf := storage.NewBufferWriter()
 
 	// test nullValue
 	opt := &csvOption{separator: []byte(","), delimiter: doubleQuotationMark, nullValue: "\\N"}
@@ -176,7 +176,7 @@ func (s *testUtilSuite) TestSQLDataTypes(c *C) {
 		tableData := [][]driver.Value{{origin}}
 		colType := []string{sqlType}
 		tableIR := newMockTableIR("test", "t", tableData, nil, colType)
-		bf := &bytes.Buffer{}
+		bf := storage.NewBufferWriter()
 
 		err := WriteInsert(context.Background(), tableIR, bf, UnspecifiedSize, UnspecifiedSize)
 		c.Assert(err, IsNil)
@@ -187,12 +187,12 @@ func (s *testUtilSuite) TestSQLDataTypes(c *C) {
 }
 
 func (s *testUtilSuite) TestWrite(c *C) {
-	mocksw := &mockStringWriter{}
+	mocksw := &mockPoisonWriter{}
 	src := []string{"test", "loooooooooooooooooooong", "poison"}
 	exp := []string{"test", "loooooooooooooooooooong", "poison_error"}
 
 	for i, s := range src {
-		err := write(mocksw, s)
+		err := write(context.Background(), mocksw, s)
 		if err != nil {
 			c.Assert(err.Error(), Equals, exp[i])
 		} else {
@@ -200,6 +200,6 @@ func (s *testUtilSuite) TestWrite(c *C) {
 			c.Assert(mocksw.buf, Equals, exp[i])
 		}
 	}
-	err := write(mocksw, "test")
+	err := write(context.Background(), mocksw, "test")
 	c.Assert(err, IsNil)
 }