Repository: pingcap/dumpling
Pull request #301 (2021-06-27 10:15:34)

dump: always split TiDB v3.* tables through tidb rowid to save TiDB's memory
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### What problem does this PR solve? <!--add issue link with summary if exists-->
fix https://github.com/pingcap/dumpling/issues/295, an extension of https://github.com/pingcap/dumpling/pull/273
In TiDB v3.x:
1. table INFORMATION_SCHEMA.TIKV_REGION_STATUS doesn't have table_name/table_schema. 
2. doesn't have `SHOW TABLE REGIONS` statement.
3. table INFORMATION_SCHEMA.PARTITIONS doesn't actually have data.
4. doesn't have `tidb_decode_key` function.
```sql
mysql> show create table information_schema.TIKV_REGION_STATUS;
+--------------------+--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| Table              | Create Table                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               |
+--------------------+--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| TIKV_REGION_STATUS | CREATE TABLE `TIKV_REGION_STATUS` (
  `REGION_ID` bigint(21) unsigned DEFAULT NULL,
  `START_KEY` text DEFAULT NULL,
  `END_KEY` text DEFAULT NULL,
  `EPOCH_CONF_VER` bigint(21) unsigned DEFAULT NULL,
  `EPOCH_VERSION` bigint(21) unsigned DEFAULT NULL,
  `WRITTEN_BYTES` bigint(21) unsigned DEFAULT NULL,
  `READ_BYTES` bigint(21) unsigned DEFAULT NULL,
  `APPROXIMATE_SIZE` bigint(21) unsigned DEFAULT NULL,
  `APPROXIMATE_KEYS` bigint(21) unsigned DEFAULT NULL
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_bin |
+--------------------+--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
1 row in set (0.00 sec)
```

### What is changed and how it works?
Split chunks by `PKIsHandle` for TiDB v3.*. Make sure TiDB won't OOM through splitting tables by rowids.
We do some staff by our own to solve the problem that tidb lacks some info.

### Check List <!--REMOVE the items that are not applicable-->

Tests <!-- At least one of them must be included. -->

 - Unit test
 - Integration test
 - Manual test (add detailed scripts or steps below)
Test dump with v3.0.0. The result is looks expected.

Related changes

 - Need to cherry-pick to the release branch
 
### Release note

<!-- bugfixes or new feature need a release note, must in the form of a list, such as

- support -T/--tables-list argument

or if no need to be included in the release note, just add the following line

- No release note
-->
- Always split TiDB v3.* tables through tidb rowid to save TiDB's memory.

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<!--Review Notification Identifier-->
lichunzhu: @kennytm PTAL

Patch:
diff --git a/go.mod b/go.mod
index f91b95b..06455c7 100644
--- a/go.mod
+++ b/go.mod
@@ -18,7 +18,8 @@ require (
 	github.com/pingcap/errors v0.11.5-0.20201126102027-b0a155152ca3
 	github.com/pingcap/failpoint v0.0.0-20210316064728-7acb0f0a3dfd
 	github.com/pingcap/log v0.0.0-20210317133921-96f4fcab92a4
-	github.com/pingcap/tidb v1.1.0-beta.0.20210517044538-8ad868f801fc // indirect
+	github.com/pingcap/parser v0.0.0-20210513020953-ae2c4497c07b
+	github.com/pingcap/tidb v1.1.0-beta.0.20210517044538-8ad868f801fc
 	github.com/pingcap/tidb-tools v4.0.9-0.20201127090955-2707c97b3853+incompatible
 	github.com/prometheus/client_golang v1.5.1
 	github.com/prometheus/client_model v0.2.0
diff --git a/v4/export/config.go b/v4/export/config.go
index b7bf104..4ef6d45 100644
--- a/v4/export/config.go
+++ b/v4/export/config.go
@@ -561,8 +561,9 @@ const (
 )
 
 var (
-	gcSafePointVersion = semver.New("4.0.0")
-	tableSampleVersion = semver.New("5.0.0-nightly")
+	decodeRegionVersion = semver.New("3.0.0")
+	gcSafePointVersion  = semver.New("4.0.0")
+	tableSampleVersion  = semver.New("5.0.0-nightly")
 )
 
 // ServerInfo is the combination of ServerType and ServerInfo
diff --git a/v4/export/dump.go b/v4/export/dump.go
index 947f187..5f0d658 100755
--- a/v4/export/dump.go
+++ b/v4/export/dump.go
@@ -6,8 +6,11 @@ import (
 	"bytes"
 	"context"
 	"database/sql"
+	"encoding/hex"
 	"fmt"
 	"math/big"
+	"sort"
+	"strconv"
 	"strings"
 	"time"
 
@@ -22,11 +25,16 @@ import (
 	"github.com/pingcap/errors"
 	"github.com/pingcap/failpoint"
 	pclog "github.com/pingcap/log"
+	"github.com/pingcap/tidb/store/helper"
+	"github.com/pingcap/tidb/tablecodec"
+	"github.com/pingcap/tidb/util/codec"
 	pd "github.com/tikv/pd/client"
 	"go.uber.org/zap"
 	"golang.org/x/sync/errgroup"
 )
 
+var openDBFunc = sql.Open
+
 // Dumper is the dump progress structure
 type Dumper struct {
 	tctx      *tcontext.Context
@@ -36,16 +44,18 @@ type Dumper struct {
 	extStore storage.ExternalStorage
 	dbHandle *sql.DB
 
-	tidbPDClientForGC pd.Client
+	tidbPDClientForGC         pd.Client
+	selectTiDBTableRegionFunc func(tctx *tcontext.Context, conn *sql.Conn, dbName, tableName string) (pkFields []string, pkVals [][]string, err error)
 }
 
 // NewDumper returns a new Dumper
 func NewDumper(ctx context.Context, conf *Config) (*Dumper, error) {
 	tctx, cancelFn := tcontext.Background().WithContext(ctx).WithCancel()
 	d := &Dumper{
-		tctx:      tctx,
-		conf:      conf,
-		cancelCtx: cancelFn,
+		tctx:                      tctx,
+		conf:                      conf,
+		cancelCtx:                 cancelFn,
+		selectTiDBTableRegionFunc: selectTiDBTableRegion,
 	}
 	err := adjustConfig(conf,
 		registerTLSConfig,
@@ -139,6 +149,9 @@ func (d *Dumper) Dump() (dumpErr error) {
 			return err
 		}
 	}
+	if err = d.renewSelectTableRegionFuncForLowerTiDB(tctx); err != nil {
+		tctx.L().Error("fail to update select table region info for TiDB", zap.Error(err))
+	}
 
 	rebuildConn := func(conn *sql.Conn) (*sql.Conn, error) {
 		// make sure that the lock connection is still alive
@@ -214,8 +227,7 @@ func (d *Dumper) Dump() (dumpErr error) {
 	})
 
 	// get estimate total count
-	err = d.getEstimateTotalRowsCount(tctx, metaConn)
-	if err != nil {
+	if err = d.getEstimateTotalRowsCount(tctx, metaConn); err != nil {
 		tctx.L().Error("fail to get estimate total count", zap.Error(err))
 	}
 
@@ -442,7 +454,7 @@ func (d *Dumper) concurrentDumpTable(tctx *tcontext.Context, conn *sql.Conn, met
 	if conf.ServerInfo.ServerType == ServerTypeTiDB &&
 		conf.ServerInfo.ServerVersion != nil &&
 		(conf.ServerInfo.ServerVersion.Compare(*tableSampleVersion) >= 0 ||
-			(conf.ServerInfo.HasTiKV && conf.ServerInfo.ServerVersion.Compare(*gcSafePointVersion) >= 0)) {
+			(conf.ServerInfo.HasTiKV && conf.ServerInfo.ServerVersion.Compare(*decodeRegionVersion) >= 0)) {
 		return d.concurrentDumpTiDBTables(tctx, conn, meta, taskChan)
 	}
 	field, err := pickupPossibleField(db, tbl, conn, conf)
@@ -578,18 +590,22 @@ func (d *Dumper) concurrentDumpTiDBTables(tctx *tcontext.Context, conn *sql.Conn
 		handleVals     [][]string
 		err            error
 	)
+	// for TiDB v5.0+, we can use table sample directly
 	if d.conf.ServerInfo.ServerVersion.Compare(*tableSampleVersion) >= 0 {
 		tctx.L().Debug("dumping TiDB tables with TABLESAMPLE",
 			zap.String("database", db), zap.String("table", tbl))
 		handleColNames, handleVals, err = selectTiDBTableSample(tctx, conn, db, tbl)
 	} else {
+		// for TiDB v3.0+, we can use table region decode in TiDB directly
 		tctx.L().Debug("dumping TiDB tables with TABLE REGIONS",
 			zap.String("database", db), zap.String("table", tbl))
 		var partitions []string
-		partitions, err = GetPartitionNames(conn, db, tbl)
+		if d.conf.ServerInfo.ServerVersion.Compare(*gcSafePointVersion) >= 0 {
+			partitions, err = GetPartitionNames(conn, db, tbl)
+		}
 		if err == nil {
 			if len(partitions) == 0 {
-				handleColNames, handleVals, err = selectTiDBTableRegion(tctx, conn, db, tbl)
+				handleColNames, handleVals, err = d.selectTiDBTableRegionFunc(tctx, conn, db, tbl)
 			} else {
 				return d.concurrentDumpTiDBPartitionTables(tctx, conn, meta, taskChan, partitions)
 			}
@@ -1153,3 +1169,93 @@ func setSessionParam(d *Dumper) error {
 	}
 	return nil
 }
+
+func (d *Dumper) renewSelectTableRegionFuncForLowerTiDB(tctx *tcontext.Context) error {
+	conf := d.conf
+	if !(conf.ServerInfo.ServerType == ServerTypeTiDB && conf.ServerInfo.ServerVersion != nil && conf.ServerInfo.HasTiKV &&
+		conf.ServerInfo.ServerVersion.Compare(*decodeRegionVersion) >= 0 &&
+		conf.ServerInfo.ServerVersion.Compare(*gcSafePointVersion) < 0) {
+		tctx.L().Debug("no need to build region info because database is not TiDB 3.x")
+		return nil
+	}
+	dbHandle, err := openDBFunc("mysql", conf.GetDSN(""))
+	if err != nil {
+		return errors.Trace(err)
+	}
+	defer dbHandle.Close()
+	conn, err := dbHandle.Conn(tctx)
+	if err != nil {
+		return errors.Trace(err)
+	}
+	defer conn.Close()
+	dbInfos, err := GetDBInfo(conn, DatabaseTablesToMap(conf.Tables))
+	if err != nil {
+		return errors.Trace(err)
+	}
+	regionsInfo, err := GetRegionInfos(conn)
+	if err != nil {
+		return errors.Trace(err)
+	}
+	tikvHelper := &helper.Helper{}
+	tableInfos := tikvHelper.GetRegionsTableInfo(regionsInfo, dbInfos)
+
+	tableInfoMap := make(map[string]map[string][]int64, len(conf.Tables))
+	for _, region := range regionsInfo.Regions {
+		tableList := tableInfos[region.ID]
+		for _, table := range tableList {
+			db, tbl := table.DB.Name.O, table.Table.Name.O
+			if _, ok := tableInfoMap[db]; !ok {
+				tableInfoMap[db] = make(map[string][]int64, len(conf.Tables[db]))
+			}
+
+			key, err := hex.DecodeString(region.StartKey)
+			if err != nil {
+				d.L().Debug("invalid region start key", zap.Error(err), zap.String("key", region.StartKey))
+				continue
+			}
+			// Auto decode byte if needed.
+			_, bs, err := codec.DecodeBytes(key, nil)
+			if err == nil {
+				key = bs
+			}
+			// Try to decode it as a record key.
+			tableID, handle, err := tablecodec.DecodeRecordKey(key)
+			if err != nil {
+				d.L().Debug("fail to decode region start key", zap.Error(err), zap.String("key", region.StartKey), zap.Int64("tableID", tableID))
+				continue
+			}
+			if handle.IsInt() {
+				tableInfoMap[db][tbl] = append(tableInfoMap[db][tbl], handle.IntValue())
+			} else {
+				d.L().Debug("not an int handle", zap.Error(err), zap.Stringer("handle", handle))
+			}
+		}
+	}
+	for _, tbInfos := range tableInfoMap {
+		for _, tbInfoLoop := range tbInfos {
+			// make sure tbInfo is only used in this loop
+			tbInfo := tbInfoLoop
+			sort.Slice(tbInfo, func(i, j int) bool {
+				return tbInfo[i] < tbInfo[j]
+			})
+		}
+	}
+
+	d.selectTiDBTableRegionFunc = func(tctx *tcontext.Context, conn *sql.Conn, dbName, tableName string) (pkFields []string, pkVals [][]string, err error) {
+		pkFields, _, err = selectTiDBRowKeyFields(conn, dbName, tableName, checkTiDBTableRegionPkFields)
+		if err != nil {
+			return
+		}
+		if tbInfos, ok := tableInfoMap[dbName]; ok {
+			if tbInfo, ok := tbInfos[tableName]; ok {
+				pkVals = make([][]string, len(tbInfo))
+				for i, val := range tbInfo {
+					pkVals[i] = []string{strconv.FormatInt(val, 10)}
+				}
+			}
+		}
+		return
+	}
+
+	return nil
+}
diff --git a/v4/export/prepare.go b/v4/export/prepare.go
index 362ff7c..000e1cf 100644
--- a/v4/export/prepare.go
+++ b/v4/export/prepare.go
@@ -183,3 +183,17 @@ func (d DatabaseTables) Literal() string {
 
 	return b.String()
 }
+
+// DatabaseTablesToMap transfers DatabaseTables to Map
+func DatabaseTablesToMap(d DatabaseTables) map[string]map[string]struct{} {
+	mp := make(map[string]map[string]struct{}, len(d))
+	for name, infos := range d {
+		mp[name] = make(map[string]struct{}, len(infos))
+		for _, info := range infos {
+			if info.Type == TableTypeBase {
+				mp[name][info.Name] = struct{}{}
+			}
+		}
+	}
+	return mp
+}
diff --git a/v4/export/region_results.csv b/v4/export/region_results.csv
new file mode 100644
index 0000000..07c0355
--- /dev/null
+++ b/v4/export/region_results.csv
@@ -0,0 +1,990 @@
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+2875,"7480000000000007FF9E00000000000000F8","7480000000000007FFA000000000000000F8"
+2879,"7480000000000007FFA000000000000000F8","7480000000000007FFA200000000000000F8"
+2877,"7480000000000007FFA200000000000000F8","7480000000000007FFA300000000000000F8"
+2881,"7480000000000007FFA300000000000000F8","7480000000000007FFA600000000000000F8"
+2903,"7480000000000007FFA600000000000000F8","7480000000000007FFA800000000000000F8"
+2895,"7480000000000007FFA800000000000000F8","7480000000000007FFA900000000000000F8"
+2899,"7480000000000007FFA900000000000000F8","7480000000000007FFAA00000000000000F8"
+2901,"7480000000000007FFAA00000000000000F8","7480000000000007FFAB00000000000000F8"
+2891,"7480000000000007FFAB00000000000000F8","7480000000000007FFAC00000000000000F8"
+2907,"7480000000000007FFAC00000000000000F8","7480000000000007FFAD00000000000000F8"
+2909,"7480000000000007FFAD00000000000000F8","7480000000000007FFAE00000000000000F8"
+2885,"7480000000000007FFAE00000000000000F8","7480000000000007FFAF00000000000000F8"
+2905,"7480000000000007FFAF00000000000000F8","7480000000000007FFB000000000000000F8"
+2883,"7480000000000007FFB000000000000000F8","7480000000000007FFB100000000000000F8"
+2893,"7480000000000007FFB100000000000000F8","7480000000000007FFB300000000000000F8"
+2897,"7480000000000007FFB300000000000000F8","7480000000000007FFB400000000000000F8"
+2887,"7480000000000007FFB400000000000000F8","7480000000000007FFB500000000000000F8"
+2889,"7480000000000007FFB500000000000000F8","7480000000000007FFB700000000000000F8"
+2911,"7480000000000007FFB700000000000000F8","7480000000000007FFCB00000000000000F8"
+2913,"7480000000000007FFCB00000000000000F8","7480000000000007FFCF00000000000000F8"
+2915,"7480000000000007FFCF00000000000000F8","7480000000000007FFD100000000000000F8"
+2917,"7480000000000007FFD100000000000000F8","7480000000000007FFD600000000000000F8"
+2919,"7480000000000007FFD600000000000000F8","7480000000000007FFDF00000000000000F8"
+2921,"7480000000000007FFDF00000000000000F8","7480000000000007FFE300000000000000F8"
+2923,"7480000000000007FFE300000000000000F8","7480000000000007FFE500000000000000F8"
+2925,"7480000000000007FFE500000000000000F8","7480000000000007FFEA00000000000000F8"
+2927,"7480000000000007FFEA00000000000000F8","7480000000000007FFF700000000000000F8"
+2929,"7480000000000007FFF700000000000000F8","7480000000000007FFFB00000000000000F8"
+2931,"7480000000000007FFFB00000000000000F8","7480000000000008FF0000000000000000F8"
+2933,"7480000000000008FF0000000000000000F8","7480000000000008FF0600000000000000F8"
+2935,"7480000000000008FF0600000000000000F8","7480000000000008FF0E00000000000000F8"
+2937,"7480000000000008FF0E00000000000000F8","7480000000000008FF1300000000000000F8"
+2939,"7480000000000008FF1300000000000000F8","7480000000000008FF1800000000000000F8"
+2941,"7480000000000008FF1800000000000000F8","7480000000000008FF1A00000000000000F8"
+2943,"7480000000000008FF1A00000000000000F8","7480000000000008FF2200000000000000F8"
+2945,"7480000000000008FF2200000000000000F8","7480000000000008FF2700000000000000F8"
+2947,"7480000000000008FF2700000000000000F8","7480000000000008FF2E00000000000000F8"
+2949,"7480000000000008FF2E00000000000000F8","7480000000000008FF3000000000000000F8"
+4001,"7480000000000008FF3000000000000000F8","7480000000000008FF4300000000000000F8"
+4003,"7480000000000008FF4300000000000000F8","7480000000000008FF4400000000000000F8"
+4005,"7480000000000008FF4400000000000000F8","7480000000000008FF4500000000000000F8"
+4007,"7480000000000008FF4500000000000000F8","7480000000000008FF4600000000000000F8"
+4009,"7480000000000008FF4600000000000000F8","7480000000000008FF5000000000000000F8"
+4017,"7480000000000008FF5000000000000000F8","7480000000000008FF505F728000000000FF0EA6010000000000FA"
+4011,"7480000000000008FF505F728000000000FF0EA6010000000000FA","7480000000000008FF5100000000000000F8"
+4019,"7480000000000008FF5100000000000000F8","7480000000000008FF515F728000000000FF2D2A810000000000FA"
+4013,"7480000000000008FF515F728000000000FF2D2A810000000000FA","7480000000000008FF5200000000000000F8"
+4021,"7480000000000008FF5200000000000000F8","7480000000000008FF525F728000000000FF4BAF010000000000FA"
+4015,"7480000000000008FF525F728000000000FF4BAF010000000000FA","7480000000000008FF5300000000000000F8"
+4023,"7480000000000008FF5300000000000000F8","7480000000000008FF535F728000000000FF6A33810000000000FA"
+4025,"7480000000000008FF535F728000000000FF6A33810000000000FA","7480000000000008FF5500000000000000F8"
+5001,"7480000000000008FF5500000000000000F8","7480000000000008FF5800000000000000F8"
+5005,"7480000000000008FF5800000000000000F8","7480000000000008FF585F698000000000FF0000010380000000FF000EA60103800000FF00000EA601000000FC"
+5009,"7480000000000008FF585F698000000000FF0000010380000000FF000EA60103800000FF00000EA601000000FC","7480000000000008FF585F698000000000FF0000010380000000FF001D4C0103800000FF00001D4C01000000FC"
+5013,"7480000000000008FF585F698000000000FF0000010380000000FF001D4C0103800000FF00001D4C01000000FC","7480000000000008FF585F698000000000FF0000010380000000FF002BF20103800000FF00002BF201000000FC"
+5017,"7480000000000008FF585F698000000000FF0000010380000000FF002BF20103800000FF00002BF201000000FC","7480000000000008FF585F698000000000FF0000010380000000FF003A980103800000FF00003A9801000000FC"
+5021,"7480000000000008FF585F698000000000FF0000010380000000FF003A980103800000FF00003A9801000000FC","7480000000000008FF585F698000000000FF0000010380000000FF00493E0103800000FF0000493E01000000FC"
+5025,"7480000000000008FF585F698000000000FF0000010380000000FF00493E0103800000FF0000493E01000000FC","7480000000000008FF585F698000000000FF0000010380000000FF0057E40103800000FF000057E401000000FC"
+5029,"7480000000000008FF585F698000000000FF0000010380000000FF0057E40103800000FF000057E401000000FC","7480000000000008FF585F698000000000FF0000010380000000FF00668A0103800000FF0000668A01000000FC"
+5003,"7480000000000008FF585F698000000000FF0000010380000000FF00668A0103800000FF0000668A01000000FC","7480000000000008FF585F728000000000FF013EB00000000000FA"
+5007,"7480000000000008FF585F728000000000FF013EB00000000000FA","7480000000000008FF585F728000000000FF0FE4B00000000000FA"
+5011,"7480000000000008FF585F728000000000FF0FE4B00000000000FA","7480000000000008FF585F728000000000FF1E8AB00000000000FA"
+5015,"7480000000000008FF585F728000000000FF1E8AB00000000000FA","7480000000000008FF585F728000000000FF2D30B00000000000FA"
+5019,"7480000000000008FF585F728000000000FF2D30B00000000000FA","7480000000000008FF585F728000000000FF3BD6B00000000000FA"
+5023,"7480000000000008FF585F728000000000FF3BD6B00000000000FA","7480000000000008FF585F728000000000FF4A7CB00000000000FA"
+5027,"7480000000000008FF585F728000000000FF4A7CB00000000000FA","7480000000000008FF585F728000000000FF5922B00000000000FA"
+5031,"7480000000000008FF585F728000000000FF5922B00000000000FA","7480000000000008FF585F728000000000FF67C8B00000000000FA"
+5033,"7480000000000008FF585F728000000000FF67C8B00000000000FA","7480000000000008FF5B00000000000000F8"
+5043,"7480000000000008FF5B00000000000000F8","7480000000000008FF5B5F698000000000FF0000010380000000FF000EA60103800000FF00000EA601000000FC"
+5041,"7480000000000008FF5B5F698000000000FF0000010380000000FF000EA60103800000FF00000EA601000000FC","7480000000000008FF5B5F728000000000FF02BF210000000000FA"
+5045,"7480000000000008FF5B5F728000000000FF02BF210000000000FA","7480000000000008FF5B5F728000000000FF1165210000000000FA"
+5035,"7480000000000008FF5B5F728000000000FF1165210000000000FA","7480000000000008FF5C00000000000000F8"
+5049,"7480000000000008FF5C00000000000000F8","7480000000000008FF5C5F698000000000FF0000010380000000FF002D2A8103800000FF00002D2A81000000FC"
+5047,"7480000000000008FF5C5F698000000000FF0000010380000000FF002D2A8103800000FF00002D2A81000000FC","7480000000000008FF5C5F728000000000FF2191C10000000000FA"
+5051,"7480000000000008FF5C5F728000000000FF2191C10000000000FA","7480000000000008FF5C5F728000000000FF3037C10000000000FA"
+5037,"7480000000000008FF5C5F728000000000FF3037C10000000000FA","7480000000000008FF5D00000000000000F8"
+5057,"7480000000000008FF5D00000000000000F8","7480000000000008FF5D5F698000000000FF0000010380000000FF004BAF0103800000FF00004BAF01000000FC"
+5053,"7480000000000008FF5D5F698000000000FF0000010380000000FF004BAF0103800000FF00004BAF01000000FC","7480000000000008FF5D5F728000000000FF3F7A010000000000FA"
+5055,"7480000000000008FF5D5F728000000000FF3F7A010000000000FA","7480000000000008FF5D5F728000000000FF4E20010000000000FA"
+5039,"7480000000000008FF5D5F728000000000FF4E20010000000000FA","7480000000000008FF5E00000000000000F8"
+5061,"7480000000000008FF5E00000000000000F8","7480000000000008FF5E5F698000000000FF0000010380000000FF006A338103800000FF00006A3381000000FC"
+5059,"7480000000000008FF5E5F698000000000FF0000010380000000FF006A338103800000FF00006A3381000000FC","7480000000000008FF5E5F728000000000FF5E25910000000000FA"
+5063,"7480000000000008FF5E5F728000000000FF5E25910000000000FA","7480000000000008FF5E5F728000000000FF6CCB910000000000FA"
+2,"7480000000000008FF5E5F728000000000FF6CCB910000000000FA",""
diff --git a/v4/export/sql.go b/v4/export/sql.go
index 655d9c2..f6c1b80 100644
--- a/v4/export/sql.go
+++ b/v4/export/sql.go
@@ -15,6 +15,8 @@ import (
 	tcontext "github.com/pingcap/dumpling/v4/context"
 
 	"github.com/pingcap/errors"
+	"github.com/pingcap/parser/model"
+	"github.com/pingcap/tidb/store/helper"
 	"go.uber.org/zap"
 )
 
@@ -473,6 +475,51 @@ func GetSpecifiedColumnValueAndClose(rows *sql.Rows, columnName string) ([]strin
 	return strs, errors.Trace(rows.Err())
 }
 
+// GetSpecifiedColumnValuesAndClose get columns' values whose name is equal to columnName
+func GetSpecifiedColumnValuesAndClose(rows *sql.Rows, columnName ...string) ([][]string, error) {
+	if rows == nil {
+		return [][]string{}, nil
+	}
+	defer rows.Close()
+	var strs [][]string
+	columns, err := rows.Columns()
+	if err != nil {
+		return strs, errors.Trace(err)
+	}
+	addr := make([]interface{}, len(columns))
+	oneRow := make([]sql.NullString, len(columns))
+	fieldIndexMp := make(map[int]int)
+	for i, col := range columns {
+		addr[i] = &oneRow[i]
+		for j, name := range columnName {
+			if strings.ToUpper(col) == name {
+				fieldIndexMp[i] = j
+			}
+		}
+	}
+	if len(fieldIndexMp) == 0 {
+		return strs, nil
+	}
+	for rows.Next() {
+		err := rows.Scan(addr...)
+		if err != nil {
+			return strs, errors.Trace(err)
+		}
+		written := false
+		tmpStr := make([]string, len(columnName))
+		for colPos, namePos := range fieldIndexMp {
+			if oneRow[colPos].Valid {
+				written = true
+				tmpStr[namePos] = oneRow[colPos].String
+			}
+		}
+		if written {
+			strs = append(strs, tmpStr)
+		}
+	}
+	return strs, errors.Trace(rows.Err())
+}
+
 // GetPdAddrs gets PD address from TiDB
 func GetPdAddrs(tctx *tcontext.Context, db *sql.DB) ([]string, error) {
 	query := "SELECT * FROM information_schema.cluster_info where type = 'pd';"
@@ -562,13 +609,7 @@ func resetDBWithSessionParams(tctx *tcontext.Context, db *sql.DB, dsn string, pa
 	}
 
 	newDB, err := sql.Open("mysql", dsn)
-	if err != nil {
-		return nil, errors.Trace(err)
-	}
-
-	db.Close()
-
-	return newDB, nil
+	return newDB, errors.Trace(err)
 }
 
 func createConnWithConsistency(ctx context.Context, db *sql.DB) (*sql.Conn, error) {
@@ -816,18 +857,18 @@ func simpleQuery(conn *sql.Conn, sql string, handleOneRow func(*sql.Rows) error)
 func simpleQueryWithArgs(conn *sql.Conn, handleOneRow func(*sql.Rows) error, sql string, args ...interface{}) error {
 	rows, err := conn.QueryContext(context.Background(), sql, args...)
 	if err != nil {
-		return errors.Annotatef(err, "sql: %s", sql)
+		return errors.Annotatef(err, "sql: %s, args: %s", sql, args)
 	}
 	defer rows.Close()
 
 	for rows.Next() {
 		if err := handleOneRow(rows); err != nil {
 			rows.Close()
-			return errors.Annotatef(err, "sql: %s", sql)
+			return errors.Annotatef(err, "sql: %s, args: %s", sql, args)
 		}
 	}
 	rows.Close()
-	return errors.Annotatef(rows.Err(), "sql: %s", sql)
+	return errors.Annotatef(rows.Err(), "sql: %s, args: %s", sql, args)
 }
 
 func pickupPossibleField(dbName, tableName string, db *sql.Conn, conf *Config) (string, error) {
@@ -967,7 +1008,7 @@ func parseSnapshotToTSO(pool *sql.DB, snapshot string) (uint64, error) {
 	if !tso.Valid {
 		return 0, errors.Errorf("snapshot %s format not supported. please use tso or '2006-01-02 15:04:05' format time", snapshot)
 	}
-	return (uint64(tso.Int64)<<18)*1000 + 1, nil
+	return (uint64(tso.Int64) << 18) * 1000, nil
 }
 
 func buildWhereCondition(conf *Config, where string) string {
@@ -1009,3 +1050,157 @@ func GetPartitionNames(db *sql.Conn, schema, table string) (partitions []string,
 	}, "SELECT PARTITION_NAME from INFORMATION_SCHEMA.PARTITIONS WHERE TABLE_SCHEMA = ? AND TABLE_NAME = ?", schema, table)
 	return
 }
+
+// GetPartitionTableIDs get partition tableIDs through histograms.
+// SHOW STATS_HISTOGRAMS  has db_name,table_name,partition_name but doesn't have partition id
+// mysql.stats_histograms has partition_id but doesn't have db_name,table_name,partition_name
+// So we combine the results from these two sqls to get partition ids for each table
+// If UPDATE_TIME,DISTINCT_COUNT are equal, we assume these two records can represent one line.
+// If histograms are not accurate or (UPDATE_TIME,DISTINCT_COUNT) has duplicate data, it's still fine.
+// Because the possibility is low and the effect is that we will select more than one regions in one time,
+// this will not affect the correctness of the dumping data and will not affect the memory usage much.
+// This method is tricky, but no better way is found.
+// Because TiDB v3.0.0's information_schema.partition table doesn't have partition name or partition id info
+// return (dbName -> tbName -> partitionName -> partitionID, error)
+func GetPartitionTableIDs(db *sql.Conn, tables map[string]map[string]struct{}) (map[string]map[string]map[string]int64, error) {
+	const (
+		showStatsHistogramsSQL   = "SHOW STATS_HISTOGRAMS"
+		selectStatsHistogramsSQL = "SELECT TABLE_ID,FROM_UNIXTIME(VERSION DIV 262144 DIV 1000,'%Y-%m-%d %H:%i:%s') AS UPDATE_TIME,DISTINCT_COUNT FROM mysql.stats_histograms"
+	)
+	partitionIDs := make(map[string]map[string]map[string]int64, len(tables))
+	rows, err := db.QueryContext(context.Background(), showStatsHistogramsSQL)
+	if err != nil {
+		return nil, errors.Annotatef(err, "sql: %s", showStatsHistogramsSQL)
+	}
+	results, err := GetSpecifiedColumnValuesAndClose(rows, "DB_NAME", "TABLE_NAME", "PARTITION_NAME", "UPDATE_TIME", "DISTINCT_COUNT")
+	if err != nil {
+		return nil, errors.Annotatef(err, "sql: %s", showStatsHistogramsSQL)
+	}
+	type partitionInfo struct {
+		dbName, tbName, partitionName string
+	}
+	saveMap := make(map[string]map[string]partitionInfo)
+	for _, oneRow := range results {
+		dbName, tbName, partitionName, updateTime, distinctCount := oneRow[0], oneRow[1], oneRow[2], oneRow[3], oneRow[4]
+		if len(partitionName) == 0 {
+			continue
+		}
+		if tbm, ok := tables[dbName]; ok {
+			if _, ok = tbm[tbName]; ok {
+				if _, ok = saveMap[updateTime]; !ok {
+					saveMap[updateTime] = make(map[string]partitionInfo)
+				}
+				saveMap[updateTime][distinctCount] = partitionInfo{
+					dbName:        dbName,
+					tbName:        tbName,
+					partitionName: partitionName,
+				}
+			}
+		}
+	}
+	if len(saveMap) == 0 {
+		return map[string]map[string]map[string]int64{}, nil
+	}
+	err = simpleQuery(db, selectStatsHistogramsSQL, func(rows *sql.Rows) error {
+		var (
+			tableID                   int64
+			updateTime, distinctCount string
+		)
+		err2 := rows.Scan(&tableID, &updateTime, &distinctCount)
+		if err2 != nil {
+			return errors.Trace(err2)
+		}
+		if mpt, ok := saveMap[updateTime]; ok {
+			if partition, ok := mpt[distinctCount]; ok {
+				dbName, tbName, partitionName := partition.dbName, partition.tbName, partition.partitionName
+				if _, ok := partitionIDs[dbName]; !ok {
+					partitionIDs[dbName] = make(map[string]map[string]int64)
+				}
+				if _, ok := partitionIDs[dbName][tbName]; !ok {
+					partitionIDs[dbName][tbName] = make(map[string]int64)
+				}
+				partitionIDs[dbName][tbName][partitionName] = tableID
+			}
+		}
+		return nil
+	})
+	return partitionIDs, err
+}
+
+// GetDBInfo get model.DBInfos from database sql interface.
+// We need table_id to check whether a region belongs to this table
+func GetDBInfo(db *sql.Conn, tables map[string]map[string]struct{}) ([]*model.DBInfo, error) {
+	const tableIDSQL = "SELECT TABLE_SCHEMA,TABLE_NAME,TIDB_TABLE_ID FROM INFORMATION_SCHEMA.TABLES ORDER BY TABLE_SCHEMA"
+
+	schemas := make([]*model.DBInfo, 0, len(tables))
+	var (
+		tableSchema, tableName string
+		tidbTableID            int64
+	)
+	partitionIDs, err := GetPartitionTableIDs(db, tables)
+	if err != nil {
+		return nil, err
+	}
+	err = simpleQuery(db, tableIDSQL, func(rows *sql.Rows) error {
+		err2 := rows.Scan(&tableSchema, &tableName, &tidbTableID)
+		if err2 != nil {
+			return errors.Trace(err2)
+		}
+		if tbm, ok := tables[tableSchema]; !ok {
+			return nil
+		} else if _, ok = tbm[tableName]; !ok {
+			return nil
+		}
+		last := len(schemas) - 1
+		if last < 0 || schemas[last].Name.O != tableSchema {
+			schemas = append(schemas, &model.DBInfo{
+				Name:   model.CIStr{O: tableSchema},
+				Tables: make([]*model.TableInfo, 0, len(tables[tableSchema])),
+			})
+			last++
+		}
+		var partition *model.PartitionInfo
+		if tbm, ok := partitionIDs[tableSchema]; ok {
+			if ptm, ok := tbm[tableName]; ok {
+				partition = &model.PartitionInfo{Definitions: make([]model.PartitionDefinition, 0, len(ptm))}
+				for partitionName, partitionID := range ptm {
+					partition.Definitions = append(partition.Definitions, model.PartitionDefinition{
+						ID:   partitionID,
+						Name: model.CIStr{O: partitionName},
+					})
+				}
+			}
+		}
+		schemas[last].Tables = append(schemas[last].Tables, &model.TableInfo{
+			ID:        tidbTableID,
+			Name:      model.CIStr{O: tableName},
+			Partition: partition,
+		})
+		return nil
+	})
+	return schemas, err
+}
+
+// GetRegionInfos get region info including regionID, start key, end key from database sql interface.
+// start key, end key includes information to help split table
+func GetRegionInfos(db *sql.Conn) (*helper.RegionsInfo, error) {
+	const tableRegionSQL = "SELECT REGION_ID,START_KEY,END_KEY FROM INFORMATION_SCHEMA.TIKV_REGION_STATUS ORDER BY START_KEY;"
+	var (
+		regionID         int64
+		startKey, endKey string
+	)
+	regionsInfo := &helper.RegionsInfo{Regions: make([]helper.RegionInfo, 0)}
+	err := simpleQuery(db, tableRegionSQL, func(rows *sql.Rows) error {
+		err := rows.Scan(&regionID, &startKey, &endKey)
+		if err != nil {
+			return errors.Trace(err)
+		}
+		regionsInfo.Regions = append(regionsInfo.Regions, helper.RegionInfo{
+			ID:       regionID,
+			StartKey: startKey,
+			EndKey:   endKey,
+		})
+		return nil
+	})
+	return regionsInfo, err
+}


Test patch:
diff --git a/v4/export/sql_test.go b/v4/export/sql_test.go
index 7d8c94a..4a956f9 100644
--- a/v4/export/sql_test.go
+++ b/v4/export/sql_test.go
@@ -6,8 +6,14 @@ import (
 	"context"
 	"database/sql"
 	"database/sql/driver"
+	"encoding/csv"
 	"errors"
 	"fmt"
+	"io"
+	"os"
+	"path"
+	"runtime"
+	"strconv"
 	"strings"
 
 	tcontext "github.com/pingcap/dumpling/v4/context"
@@ -317,7 +323,7 @@ func (s *testSQLSuite) TestParseSnapshotToTSO(c *C) {
 		WillReturnRows(sqlmock.NewRows([]string{`unix_timestamp("2020/07/18 20:31:50")`}).AddRow(1595075510))
 	tso, err := parseSnapshotToTSO(db, snapshot)
 	c.Assert(err, IsNil)
-	c.Assert(tso, Equals, (unixTimeStamp<<18)*1000+1)
+	c.Assert(tso, Equals, (unixTimeStamp<<18)*1000)
 	c.Assert(mock.ExpectationsWereMet(), IsNil)
 
 	// generate columns not valid snapshot
@@ -420,9 +426,10 @@ func (s *testSQLSuite) TestBuildTableSampleQueries(c *C) {
 	tctx, cancel := tcontext.Background().WithLogger(appLogger).WithCancel()
 
 	d := &Dumper{
-		tctx:      tctx,
-		conf:      DefaultConfig(),
-		cancelCtx: cancel,
+		tctx:                      tctx,
+		conf:                      DefaultConfig(),
+		cancelCtx:                 cancel,
+		selectTiDBTableRegionFunc: selectTiDBTableRegion,
 	}
 	d.conf.ServerInfo = ServerInfo{
 		HasTiKV:       true,
@@ -652,7 +659,7 @@ func (s *testSQLSuite) TestBuildTableSampleQueries(c *C) {
 		if len(handleColNames) > 0 {
 			taskChan := make(chan Task, 128)
 			quotaCols := make([]string, 0, len(handleColNames))
-			for _, col := range quotaCols {
+			for _, col := range handleColNames {
 				quotaCols = append(quotaCols, wrapBackTicks(col))
 			}
 			selectFields := strings.Join(quotaCols, ",")
@@ -797,9 +804,10 @@ func (s *testSQLSuite) TestBuildRegionQueriesWithoutPartition(c *C) {
 	tctx, cancel := tcontext.Background().WithLogger(appLogger).WithCancel()
 
 	d := &Dumper{
-		tctx:      tctx,
-		conf:      DefaultConfig(),
-		cancelCtx: cancel,
+		tctx:                      tctx,
+		conf:                      DefaultConfig(),
+		cancelCtx:                 cancel,
+		selectTiDBTableRegionFunc: selectTiDBTableRegion,
 	}
 	d.conf.ServerInfo = ServerInfo{
 		HasTiKV:       true,
@@ -885,7 +893,7 @@ func (s *testSQLSuite) TestBuildRegionQueriesWithoutPartition(c *C) {
 		// Test build tasks through table region
 		taskChan := make(chan Task, 128)
 		quotaCols := make([]string, 0, len(handleColNames))
-		for _, col := range quotaCols {
+		for _, col := range handleColNames {
 			quotaCols = append(quotaCols, wrapBackTicks(col))
 		}
 		selectFields := strings.Join(quotaCols, ",")
@@ -964,9 +972,10 @@ func (s *testSQLSuite) TestBuildRegionQueriesWithPartitions(c *C) {
 	tctx, cancel := tcontext.Background().WithLogger(appLogger).WithCancel()
 
 	d := &Dumper{
-		tctx:      tctx,
-		conf:      DefaultConfig(),
-		cancelCtx: cancel,
+		tctx:                      tctx,
+		conf:                      DefaultConfig(),
+		cancelCtx:                 cancel,
+		selectTiDBTableRegionFunc: selectTiDBTableRegion,
 	}
 	d.conf.ServerInfo = ServerInfo{
 		HasTiKV:       true,
@@ -1097,7 +1106,7 @@ func (s *testSQLSuite) TestBuildRegionQueriesWithPartitions(c *C) {
 		// Test build tasks through table region
 		taskChan := make(chan Task, 128)
 		quotaCols := make([]string, 0, len(handleColNames))
-		for _, col := range quotaCols {
+		for _, col := range handleColNames {
 			quotaCols = append(quotaCols, wrapBackTicks(col))
 		}
 		selectFields := strings.Join(quotaCols, ",")
@@ -1178,6 +1187,326 @@ func (s *testSQLSuite) TestBuildRegionQueriesWithPartitions(c *C) {
 	}
 }
 
+func buildMockNewRows(mock sqlmock.Sqlmock, columns []string, driverValues [][]driver.Value) *sqlmock.Rows {
+	rows := mock.NewRows(columns)
+	for _, driverValue := range driverValues {
+		rows.AddRow(driverValue...)
+	}
+	return rows
+}
+
+func readRegionCsvDriverValues(c *C) [][]driver.Value {
+	// nolint: dogsled
+	_, filename, _, _ := runtime.Caller(0)
+	csvFilename := path.Join(path.Dir(filename), "region_results.csv")
+	file, err := os.Open(csvFilename)
+	c.Assert(err, IsNil)
+	csvReader := csv.NewReader(file)
+	values := make([][]driver.Value, 0, 990)
+	for {
+		results, err := csvReader.Read()
+		if err == io.EOF {
+			break
+		}
+		c.Assert(err, IsNil)
+		if len(results) != 3 {
+			continue
+		}
+		regionID, err := strconv.Atoi(results[0])
+		c.Assert(err, IsNil)
+		startKey, endKey := results[1], results[2]
+		values = append(values, []driver.Value{regionID, startKey, endKey})
+	}
+	return values
+}
+
+func (s *testSQLSuite) TestBuildVersion3RegionQueries(c *C) {
+	db, mock, err := sqlmock.New()
+	c.Assert(err, IsNil)
+	defer db.Close()
+	conn, err := db.Conn(context.Background())
+	c.Assert(err, IsNil)
+	tctx, cancel := tcontext.Background().WithLogger(appLogger).WithCancel()
+	oldOpenFunc := openDBFunc
+	defer func() {
+		openDBFunc = oldOpenFunc
+	}()
+	openDBFunc = func(_, _ string) (*sql.DB, error) {
+		return db, nil
+	}
+
+	conf := DefaultConfig()
+	conf.ServerInfo = ServerInfo{
+		HasTiKV:       true,
+		ServerType:    ServerTypeTiDB,
+		ServerVersion: decodeRegionVersion,
+	}
+	database := "test"
+	conf.Tables = DatabaseTables{
+		database: []*TableInfo{
+			{"t1", TableTypeBase},
+			{"t2", TableTypeBase},
+			{"t3", TableTypeBase},
+			{"t4", TableTypeBase},
+		},
+	}
+	d := &Dumper{
+		tctx:                      tctx,
+		conf:                      conf,
+		cancelCtx:                 cancel,
+		selectTiDBTableRegionFunc: selectTiDBTableRegion,
+	}
+	showStatsHistograms := buildMockNewRows(mock, []string{"Db_name", "Table_name", "Partition_name", "Column_name", "Is_index", "Update_time", "Distinct_count", "Null_count", "Avg_col_size", "Correlation"},
+		[][]driver.Value{
+			{"test", "t2", "p0", "a", 0, "2021-06-27 17:43:51", 1999999, 0, 8, 0},
+			{"test", "t2", "p1", "a", 0, "2021-06-22 20:30:16", 1260000, 0, 8, 0},
+			{"test", "t2", "p2", "a", 0, "2021-06-22 20:32:16", 1230000, 0, 8, 0},
+			{"test", "t2", "p3", "a", 0, "2021-06-22 20:36:19", 2000000, 0, 8, 0},
+			{"test", "t1", "", "a", 0, "2021-04-22 15:23:58", 7100000, 0, 8, 0},
+			{"test", "t3", "", "PRIMARY", 1, "2021-06-27 22:08:43", 4980000, 0, 0, 0},
+			{"test", "t4", "p0", "PRIMARY", 1, "2021-06-28 10:54:06", 2000000, 0, 0, 0},
+			{"test", "t4", "p1", "PRIMARY", 1, "2021-06-28 10:55:04", 1300000, 0, 0, 0},
+			{"test", "t4", "p2", "PRIMARY", 1, "2021-06-28 10:57:05", 1830000, 0, 0, 0},
+			{"test", "t4", "p3", "PRIMARY", 1, "2021-06-28 10:59:04", 2000000, 0, 0, 0},
+			{"mysql", "global_priv", "", "PRIMARY", 1, "2021-06-04 20:39:44", 0, 0, 0, 0},
+		})
+	selectMySQLStatsHistograms := buildMockNewRows(mock, []string{"TABLE_ID", "VERSION", "DISTINCT_COUNT"},
+		[][]driver.Value{
+			{15, "1970-01-01 08:00:00", 0},
+			{15, "1970-01-01 08:00:00", 0},
+			{15, "1970-01-01 08:00:00", 0},
+			{41, "2021-04-22 15:23:58", 7100000},
+			{41, "2021-04-22 15:23:59", 7100000},
+			{41, "2021-04-22 15:23:59", 7100000},
+			{41, "2021-04-22 15:23:59", 7100000},
+			{27, "1970-01-01 08:00:00", 0},
+			{27, "1970-01-01 08:00:00", 0},
+			{25, "1970-01-01 08:00:00", 0},
+			{25, "1970-01-01 08:00:00", 0},
+			{2098, "2021-06-04 20:39:41", 0},
+			{2101, "2021-06-04 20:39:44", 0},
+			{2101, "2021-06-04 20:39:44", 0},
+			{2101, "2021-06-04 20:39:44", 0},
+			{2101, "2021-06-04 20:39:44", 0},
+			{2128, "2021-06-22 20:29:19", 1991680},
+			{2128, "2021-06-22 20:29:19", 1991680},
+			{2128, "2021-06-22 20:29:19", 1991680},
+			{2129, "2021-06-22 20:30:16", 1260000},
+			{2129, "2021-06-22 20:30:16", 1237120},
+			{2129, "2021-06-22 20:30:16", 1237120},
+			{2129, "2021-06-22 20:30:16", 1237120},
+			{2130, "2021-06-22 20:32:16", 1230000},
+			{2130, "2021-06-22 20:32:16", 1216128},
+			{2130, "2021-06-22 20:32:17", 1216128},
+			{2130, "2021-06-22 20:32:17", 1216128},
+			{2131, "2021-06-22 20:36:19", 2000000},
+			{2131, "2021-06-22 20:36:19", 1959424},
+			{2131, "2021-06-22 20:36:19", 1959424},
+			{2131, "2021-06-22 20:36:19", 1959424},
+			{2128, "2021-06-27 17:43:51", 1999999},
+			{2136, "2021-06-27 22:08:38", 4860000},
+			{2136, "2021-06-27 22:08:38", 4860000},
+			{2136, "2021-06-27 22:08:38", 4860000},
+			{2136, "2021-06-27 22:08:38", 4860000},
+			{2136, "2021-06-27 22:08:43", 4980000},
+			{2139, "2021-06-28 10:54:05", 1991680},
+			{2139, "2021-06-28 10:54:05", 1991680},
+			{2139, "2021-06-28 10:54:05", 1991680},
+			{2139, "2021-06-28 10:54:05", 1991680},
+			{2139, "2021-06-28 10:54:06", 2000000},
+			{2140, "2021-06-28 10:55:02", 1246336},
+			{2140, "2021-06-28 10:55:02", 1246336},
+			{2140, "2021-06-28 10:55:02", 1246336},
+			{2140, "2021-06-28 10:55:03", 1246336},
+			{2140, "2021-06-28 10:55:04", 1300000},
+			{2141, "2021-06-28 10:57:03", 1780000},
+			{2141, "2021-06-28 10:57:03", 1780000},
+			{2141, "2021-06-28 10:57:03", 1780000},
+			{2141, "2021-06-28 10:57:03", 1780000},
+			{2141, "2021-06-28 10:57:05", 1830000},
+			{2142, "2021-06-28 10:59:03", 1959424},
+			{2142, "2021-06-28 10:59:03", 1959424},
+			{2142, "2021-06-28 10:59:03", 1959424},
+			{2142, "2021-06-28 10:59:03", 1959424},
+			{2142, "2021-06-28 10:59:04", 2000000},
+		})
+	selectRegionStatusHistograms := buildMockNewRows(mock, []string{"REGION_ID", "START_KEY", "END_KEY"}, readRegionCsvDriverValues(c))
+	selectInformationSchemaTables := buildMockNewRows(mock, []string{"TABLE_SCHEMA", "TABLE_NAME", "TIDB_TABLE_ID"},
+		[][]driver.Value{
+			{"mysql", "expr_pushdown_blacklist", 39},
+			{"mysql", "user", 5},
+			{"mysql", "db", 7},
+			{"mysql", "tables_priv", 9},
+			{"mysql", "stats_top_n", 37},
+			{"mysql", "columns_priv", 11},
+			{"mysql", "bind_info", 35},
+			{"mysql", "default_roles", 33},
+			{"mysql", "role_edges", 31},
+			{"mysql", "stats_feedback", 29},
+			{"mysql", "gc_delete_range_done", 27},
+			{"mysql", "gc_delete_range", 25},
+			{"mysql", "help_topic", 17},
+			{"mysql", "global_priv", 2101},
+			{"mysql", "stats_histograms", 21},
+			{"mysql", "opt_rule_blacklist", 2098},
+			{"mysql", "stats_meta", 19},
+			{"mysql", "stats_buckets", 23},
+			{"mysql", "tidb", 15},
+			{"mysql", "GLOBAL_VARIABLES", 13},
+			{"test", "t2", 2127},
+			{"test", "t1", 41},
+			{"test", "t3", 2136},
+			{"test", "t4", 2138},
+		})
+	mock.ExpectQuery("SHOW STATS_HISTOGRAMS").
+		WillReturnRows(showStatsHistograms)
+	mock.ExpectQuery("SELECT TABLE_ID,FROM_UNIXTIME").
+		WillReturnRows(selectMySQLStatsHistograms)
+	mock.ExpectQuery("SELECT TABLE_SCHEMA,TABLE_NAME,TIDB_TABLE_ID FROM INFORMATION_SCHEMA.TABLES ORDER BY TABLE_SCHEMA").
+		WillReturnRows(selectInformationSchemaTables)
+	mock.ExpectQuery("SELECT REGION_ID,START_KEY,END_KEY FROM INFORMATION_SCHEMA.TIKV_REGION_STATUS ORDER BY START_KEY;").
+		WillReturnRows(selectRegionStatusHistograms)
+
+	c.Assert(d.renewSelectTableRegionFuncForLowerTiDB(tctx), IsNil)
+	c.Assert(mock.ExpectationsWereMet(), IsNil)
+
+	testCases := []struct {
+		tableName            string
+		handleColNames       []string
+		handleColTypes       []string
+		expectedWhereClauses []string
+		hasTiDBRowID         bool
+	}{
+		{
+			"t1",
+			[]string{"a"},
+			[]string{"int"},
+			[]string{
+				"`a`<960001",
+				"`a`>=960001 and `a`<1920001",
+				"`a`>=1920001 and `a`<2880001",
+				"`a`>=2880001 and `a`<3840001",
+				"`a`>=3840001 and `a`<4800001",
+				"`a`>=4800001 and `a`<5760001",
+				"`a`>=5760001 and `a`<6720001",
+				"`a`>=6720001",
+			},
+			false,
+		},
+		{
+			"t2",
+			[]string{"a"},
+			[]string{"int"},
+			[]string{
+				"`a`<960001",
+				"`a`>=960001 and `a`<2960001",
+				"`a`>=2960001 and `a`<4960001",
+				"`a`>=4960001 and `a`<6960001",
+				"`a`>=6960001",
+			},
+			false,
+		},
+		{
+			"t3",
+			[]string{"_tidb_rowid"},
+			[]string{"int"},
+			[]string{
+				"`_tidb_rowid`<81584",
+				"`_tidb_rowid`>=81584 and `_tidb_rowid`<1041584",
+				"`_tidb_rowid`>=1041584 and `_tidb_rowid`<2001584",
+				"`_tidb_rowid`>=2001584 and `_tidb_rowid`<2961584",
+				"`_tidb_rowid`>=2961584 and `_tidb_rowid`<3921584",
+				"`_tidb_rowid`>=3921584 and `_tidb_rowid`<4881584",
+				"`_tidb_rowid`>=4881584 and `_tidb_rowid`<5841584",
+				"`_tidb_rowid`>=5841584 and `_tidb_rowid`<6801584",
+				"`_tidb_rowid`>=6801584",
+			},
+			true,
+		},
+		{
+			"t4",
+			[]string{"_tidb_rowid"},
+			[]string{"int"},
+			[]string{
+				"`_tidb_rowid`<180001",
+				"`_tidb_rowid`>=180001 and `_tidb_rowid`<1140001",
+				"`_tidb_rowid`>=1140001 and `_tidb_rowid`<2200001",
+				"`_tidb_rowid`>=2200001 and `_tidb_rowid`<3160001",
+				"`_tidb_rowid`>=3160001 and `_tidb_rowid`<4160001",
+				"`_tidb_rowid`>=4160001 and `_tidb_rowid`<5120001",
+				"`_tidb_rowid`>=5120001 and `_tidb_rowid`<6170001",
+				"`_tidb_rowid`>=6170001 and `_tidb_rowid`<7130001",
+				"`_tidb_rowid`>=7130001",
+			},
+			true,
+		},
+	}
+
+	for i, testCase := range testCases {
+		c.Log(fmt.Sprintf("case #%d", i))
+		table := testCase.tableName
+		handleColNames := testCase.handleColNames
+		handleColTypes := testCase.handleColTypes
+
+		// Test build tasks through table region
+		taskChan := make(chan Task, 128)
+		quotaCols := make([]string, 0, len(handleColNames))
+		for _, col := range handleColNames {
+			quotaCols = append(quotaCols, wrapBackTicks(col))
+		}
+		selectFields := strings.Join(quotaCols, ",")
+		meta := &tableMeta{
+			database:      database,
+			table:         table,
+			selectedField: selectFields,
+			specCmts: []string{
+				"/*!40101 SET NAMES binary*/;",
+			},
+		}
+
+		if testCase.hasTiDBRowID {
+			mock.ExpectExec("SELECT _tidb_rowid").
+				WillReturnResult(sqlmock.NewResult(0, 0))
+		} else {
+			mock.ExpectExec("SELECT _tidb_rowid").
+				WillReturnError(&mysql.MyError{
+					Code:    mysql.ER_BAD_FIELD_ERROR,
+					State:   "42S22",
+					Message: "Unknown column '_tidb_rowid' in 'field list'",
+				})
+			rows := sqlmock.NewRows([]string{"COLUMN_NAME", "DATA_TYPE"})
+			for i := range handleColNames {
+				rows.AddRow(handleColNames[i], handleColTypes[i])
+			}
+			mock.ExpectQuery("SELECT c.COLUMN_NAME, DATA_TYPE FROM").WithArgs(database, table).WillReturnRows(rows)
+		}
+
+		rows := sqlmock.NewRows([]string{"COLUMN_NAME", "EXTRA"})
+		for _, handleCol := range handleColNames {
+			rows.AddRow(handleCol, "")
+		}
+		mock.ExpectQuery("SELECT COLUMN_NAME,EXTRA FROM INFORMATION_SCHEMA.COLUMNS").WithArgs(database, table).
+			WillReturnRows(rows)
+
+		orderByClause := buildOrderByClauseString(handleColNames)
+		c.Assert(d.concurrentDumpTable(tctx, conn, meta, taskChan), IsNil)
+		c.Assert(mock.ExpectationsWereMet(), IsNil)
+
+		chunkIdx := 0
+		for _, w := range testCase.expectedWhereClauses {
+			query := buildSelectQuery(database, table, "*", "", buildWhereCondition(d.conf, w), orderByClause)
+			task := <-taskChan
+			taskTableData, ok := task.(*TaskTableData)
+			c.Assert(ok, IsTrue)
+			c.Assert(taskTableData.ChunkIndex, Equals, chunkIdx)
+			data, ok := taskTableData.Data.(*tableData)
+			c.Assert(ok, IsTrue)
+			c.Assert(data.query, Equals, query)
+			chunkIdx++
+		}
+	}
+}
+
 func makeVersion(major, minor, patch int64, preRelease string) *semver.Version {
 	return &semver.Version{
 		Major:      major,
diff --git a/v4/export/writer_util_test.go b/v4/export/writer_util_test.go
index ff249c5..73cc5fa 100644
--- a/v4/export/writer_util_test.go
+++ b/v4/export/writer_util_test.go
@@ -21,7 +21,7 @@ var appLogger log.Logger
 func TestT(t *testing.T) {
 	initColTypeRowReceiverMap()
 	logger, _, err := log.InitAppLogger(&log.Config{
-		Level:  "info",
+		Level:  "debug",
 		File:   "",
 		Format: "text",
 	})