Repository: pingcap/dumpling
Pull request #97 (2020-06-09 03:36:38)

add set gc ts feature
Resolve https://github.com/pingcap/dumpling/issues/52 and resolve https://github.com/pingcap/dumpling/issues/95


codecov-commenter: # [Codecov](https://codecov.io/gh/pingcap/dumpling/pull/97?src=pr&el=h1) Report
> Merging [#97](https://codecov.io/gh/pingcap/dumpling/pull/97?src=pr&el=desc) into [master](https://codecov.io/gh/pingcap/dumpling/commit/0175843056a6068dd2f64afca6277d890934b63c&el=desc) will **decrease** coverage by `2.45%`.
> The diff coverage is `0.00%`.


```diff
@@            Coverage Diff             @@
##           master      #97      +/-   ##
==========================================
- Coverage   56.19%   53.73%   -2.46%     
==========================================
  Files          16       16              
  Lines        1589     1658      +69     
==========================================
- Hits          893      891       -2     
- Misses        623      693      +70     
- Partials       73       74       +1     
```


Patch:
diff --git a/cmd/dumpling/main.go b/cmd/dumpling/main.go
index 5a79c7d..8408ddd 100644
--- a/cmd/dumpling/main.go
+++ b/cmd/dumpling/main.go
@@ -14,6 +14,7 @@
 package main
 
 import (
+	"context"
 	"errors"
 	"fmt"
 	_ "net/http/pprof"
@@ -170,7 +171,7 @@ func main() {
 	conf.Sql = sql
 	conf.TableFilter = tableFilter
 
-	err = export.Dump(conf)
+	err = export.Dump(context.Background(), conf)
 	if err != nil {
 		log.Error("dump failed error stack info", zap.Error(err))
 		fmt.Printf("\ndump failed: %s\n", err.Error())
diff --git a/go.mod b/go.mod
index ce6f3ee..6703c4b 100644
--- a/go.mod
+++ b/go.mod
@@ -7,15 +7,23 @@ require (
 	github.com/coreos/go-semver v0.3.0
 	github.com/docker/go-units v0.4.0
 	github.com/go-sql-driver/mysql v1.5.0
-	github.com/golang/protobuf v1.3.1 // indirect
-	github.com/pingcap/check v0.0.0-20190102082844-67f458068fc8
-	github.com/pingcap/errors v0.11.4
+	github.com/pingcap/check v0.0.0-20191216031241-8a5a85928f12
+	github.com/pingcap/errors v0.11.5-0.20190809092503-95897b64e011
 	github.com/pingcap/log v0.0.0-20200511115504-543df19646ad
+	github.com/pingcap/pd/v4 v4.0.0
 	github.com/pingcap/tidb-tools v4.0.0-rc.2.0.20200521050818-6dd445d83fe0+incompatible
 	github.com/pkg/errors v0.9.1
 	github.com/soheilhy/cmux v0.1.4
 	github.com/spf13/pflag v1.0.3
+	github.com/stretchr/testify v1.5.1 // indirect
+	go.etcd.io/etcd v0.5.0-alpha.5.0.20191023171146-3cf2f69b5738
 	go.uber.org/zap v1.14.0
+	golang.org/x/mod v0.3.0 // indirect
+	golang.org/x/net v0.0.0-20200602114024-627f9648deb9 // indirect
 	golang.org/x/sync v0.0.0-20190911185100-cd5d95a43a6e
-	google.golang.org/grpc v1.21.0 // indirect
+	golang.org/x/sys v0.0.0-20200602225109-6fdc65e7d980 // indirect
+	golang.org/x/tools v0.0.0-20200608174601-1b747fd94509 // 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 d8a5310..8cf8408 100644
--- a/go.sum
+++ b/go.sum
@@ -3,104 +3,513 @@ github.com/BurntSushi/toml v0.3.1 h1:WXkYYl6Yr3qBf1K79EBnL4mak0OimBfB0XUf9Vl28OQ
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+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=
+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 v1.0.0-20180628173108-788fd7840127 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=
+gopkg.in/check.v1 v1.0.0-20190902080502-41f04d3bba15/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/cheggaaa/pb.v1 v1.0.25/go.mod h1:V/YB90LKu/1FcN3WVnfiiE5oMCibMjukxqG/qStrOgw=
 gopkg.in/errgo.v2 v2.1.0/go.mod h1:hNsd1EY+bozCKY1Ytp96fpM3vjJbqLJn88ws8XvfDNI=
+gopkg.in/fsnotify.v1 v1.4.7 h1:xOHLXZwVvI9hhs+cLKq5+I5onOuwQLhQwiu63xxlHs4=
+gopkg.in/fsnotify.v1 v1.4.7/go.mod h1:Tz8NjZHkW78fSQdbUxIjBTcgA1z1m8ZHf0WmKUhAMys=
+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/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 v2.0.0-20170812160011-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 v2.2.7/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 v0.0.0-20190523083050-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=
+k8s.io/klog v1.0.0/go.mod h1:4Bi6QPql/J/LkTDqv7R/cd3hPo4k2DG6Ptcz060Ez5I=
+sigs.k8s.io/yaml v1.1.0 h1:4A07+ZFc2wgJwo8YNlQpr1rVlgUDlxXHhPJciaPY5gs=
+sigs.k8s.io/yaml v1.1.0/go.mod h1:UJmg0vDUVViEyp3mgSv9WPwZCDxu4rQW1olrI1uml+o=
diff --git a/v4/export/config.go b/v4/export/config.go
index 307906b..32f5ce2 100644
--- a/v4/export/config.go
+++ b/v4/export/config.go
@@ -4,6 +4,7 @@ import (
 	"fmt"
 	"regexp"
 	"strings"
+	"time"
 
 	"github.com/coreos/go-semver/semver"
 	"github.com/pingcap/dumpling/v4/log"
@@ -84,10 +85,15 @@ func (conf *Config) getDSN(db string) string {
 }
 
 const (
-	UnspecifiedSize    = 0
-	defaultDumpThreads = 128
+	UnspecifiedSize            = 0
+	defaultDumpThreads         = 128
+	defaultDumpGCSafePointTTL  = 5 * 60
+	dumplingServiceSafePointID = "dumpling"
+	defaultEtcdDialTimeOut     = 3 * time.Second
 )
 
+var gcSafePointVersion, _ = semver.NewVersion("4.0.0")
+
 type ServerInfo struct {
 	ServerType    ServerType
 	ServerVersion *semver.Version
diff --git a/v4/export/dump.go b/v4/export/dump.go
index b7b77f1..e0f8dd1 100644
--- a/v4/export/dump.go
+++ b/v4/export/dump.go
@@ -3,17 +3,19 @@ package export
 import (
 	"context"
 	"database/sql"
+	"strconv"
 	"strings"
 	"time"
 
 	"github.com/pingcap/dumpling/v4/log"
 
 	_ "github.com/go-sql-driver/mysql"
+	pd "github.com/pingcap/pd/v4/client"
 	"go.uber.org/zap"
 	"golang.org/x/sync/errgroup"
 )
 
-func Dump(conf *Config) (err error) {
+func Dump(pCtx context.Context, conf *Config) (err error) {
 	if err = adjustConfig(conf); err != nil {
 		return withStack(err)
 	}
@@ -57,6 +59,53 @@ func Dump(conf *Config) (err error) {
 
 	filterTables(conf)
 
+	ctx, cancel := context.WithCancel(pCtx)
+	defer cancel()
+
+	var doPdGC bool
+	var pdClient pd.Client
+	if conf.ServerInfo.ServerType == ServerTypeTiDB && conf.ServerInfo.ServerVersion.Compare(*gcSafePointVersion) >= 0 {
+		pdAddrs, err := GetPdAddrs(pool)
+		if err != nil {
+			return err
+		}
+		if len(pdAddrs) > 0 {
+			doPdGC, err = checkSameCluster(ctx, pool, pdAddrs)
+			if err != nil {
+				log.Warn("meet error while check whether fetched pd addr and TiDB belongs to one cluster", zap.Error(err), zap.Strings("pdAddrs", pdAddrs))
+			} else if doPdGC {
+				pdClient, err = pd.NewClientWithContext(ctx, pdAddrs, pd.SecurityOption{})
+				if err != nil {
+					log.Warn("create pd client to control GC failed", zap.Error(err), zap.Strings("pdAddrs", pdAddrs))
+					doPdGC = false
+				}
+			}
+		}
+	}
+
+	if conf.Snapshot == "" && (doPdGC || conf.Consistency == "flush") {
+		if conf.Snapshot == "" {
+			str, err := ShowMasterStatus(pool, showMasterStatusFieldNum)
+			if err != nil {
+				return err
+			}
+			conf.Snapshot = str[snapshotFieldIndex]
+		}
+	}
+
+	if doPdGC {
+		snapshotTS, err := strconv.ParseUint(conf.Snapshot, 10, 64)
+		if err != nil {
+			return err
+		}
+		go updateServiceSafePoint(ctx, pdClient, defaultDumpGCSafePointTTL, snapshotTS)
+	} else if conf.ServerInfo.ServerType == ServerTypeTiDB {
+		log.Warn("If the amount of data to dump is large, criteria: (data more than 60GB or dumped time more than 10 minutes)\n" +
+			"you'd better adjust the tikv_gc_life_time to avoid export failure due to TiDB GC during the dump process.\n" +
+			"Before dumping: run sql `update mysql.tidb set VARIABLE_VALUE = '720h' where VARIABLE_NAME = 'tikv_gc_life_time';` in tidb.\n" +
+			"After dumping: run sql `update mysql.tidb set VARIABLE_VALUE = '10m' where VARIABLE_NAME = 'tikv_gc_life_time';` in tidb.\n")
+	}
+
 	conCtrl, err := NewConsistencyController(conf, pool)
 	if err != nil {
 		return err
@@ -86,11 +135,11 @@ func Dump(conf *Config) (err error) {
 	}
 
 	if conf.Sql == "" {
-		if err = dumpDatabases(context.Background(), conf, pool, writer); err != nil {
+		if err = dumpDatabases(ctx, conf, pool, writer); err != nil {
 			return err
 		}
 	} else {
-		if err = dumpSql(context.Background(), conf, pool, writer); err != nil {
+		if err = dumpSql(ctx, conf, pool, writer); err != nil {
 			return err
 		}
 	}
@@ -215,3 +264,31 @@ Loop:
 	}
 	return true, nil
 }
+
+func updateServiceSafePoint(ctx context.Context, pdClient pd.Client, ttl int64, snapshotTS uint64) {
+	updateInterval := time.Duration(ttl/2) * time.Second
+	tick := time.NewTicker(updateInterval)
+
+	for {
+		log.Debug("update PD safePoint limit with ttl",
+			zap.Uint64("safePoint", snapshotTS),
+			zap.Int64("ttl", ttl))
+		for retryCnt := 0; retryCnt <= 10; retryCnt++ {
+			_, err := pdClient.UpdateServiceGCSafePoint(ctx, dumplingServiceSafePointID, ttl, snapshotTS)
+			if err == nil {
+				break
+			}
+			log.Debug("update PD safePoint failed", zap.Error(err), zap.Int("retryTime", retryCnt))
+			select {
+			case <-ctx.Done():
+				return
+			case <-time.After(time.Second):
+			}
+		}
+		select {
+		case <-ctx.Done():
+			return
+		case <-tick.C:
+		}
+	}
+}
diff --git a/v4/export/sql.go b/v4/export/sql.go
index f9d9b67..98fd217 100644
--- a/v4/export/sql.go
+++ b/v4/export/sql.go
@@ -294,6 +294,55 @@ func ShowMasterStatus(db *sql.DB, fieldNum int) ([]string, error) {
 	return oneRow, nil
 }
 
+func GetSpecifiedColumnValue(rows *sql.Rows, columnName string) ([]string, error) {
+	var strs []string
+	columns, _ := rows.Columns()
+	addr := make([]interface{}, len(columns))
+	oneRow := make([]sql.NullString, len(columns))
+	var fieldIndex = -1
+	for i, col := range columns {
+		if strings.ToUpper(col) == columnName {
+			fieldIndex = i
+		}
+		addr[i] = &oneRow[i]
+	}
+	if fieldIndex == -1 {
+		return strs, nil
+	}
+	for rows.Next() {
+		err := rows.Scan(addr...)
+		if err != nil {
+			return strs, err
+		}
+		strs = append(strs, oneRow[fieldIndex].String)
+	}
+	return strs, nil
+}
+
+func GetPdAddrs(db *sql.DB) ([]string, error) {
+	query := "SELECT * FROM information_schema.cluster_info where type = 'pd';"
+	rows, err := db.Query(query)
+	if err != nil {
+		log.Warn("can't execute query from db",
+			zap.String("query", query), zap.Error(err))
+		return []string{}, err
+	}
+	defer rows.Close()
+	return GetSpecifiedColumnValue(rows, "STATUS_ADDRESS")
+}
+
+func GetTiDBDDLIDs(db *sql.DB) ([]string, error) {
+	query := "SELECT * FROM information_schema.tidb_servers_info;"
+	rows, err := db.Query(query)
+	if err != nil {
+		log.Warn("can't execute query from db",
+			zap.String("query", query), zap.Error(err))
+		return []string{}, err
+	}
+	defer rows.Close()
+	return GetSpecifiedColumnValue(rows, "DDL_ID")
+}
+
 func SetTiDBSnapshot(db *sql.DB, snapshot string) error {
 	_, err := db.Exec("SET SESSION tidb_snapshot = ?", snapshot)
 	return withStack(err)
diff --git a/v4/export/util.go b/v4/export/util.go
new file mode 100644
index 0000000..b10a6b2
--- /dev/null
+++ b/v4/export/util.go
@@ -0,0 +1,63 @@
+package export
+
+import (
+	"context"
+	"database/sql"
+	"sort"
+	"strings"
+	"time"
+
+	"go.etcd.io/etcd/clientv3"
+)
+
+const tidbServerInformationPath = "/tidb/server/info"
+
+func GetPdDDLIDs(pCtx context.Context, cli *clientv3.Client) ([]string, error) {
+	ctx, cancel := context.WithTimeout(pCtx, 10*time.Second)
+	defer cancel()
+
+	var pdDDLIds []string
+	resp, err := cli.Get(ctx, tidbServerInformationPath, clientv3.WithPrefix())
+	if err != nil {
+		return pdDDLIds, err
+	}
+	for _, kv := range resp.Kvs {
+		items := strings.Split(string(kv.Key), "/")
+		pdDDLIds = append(pdDDLIds, items[len(items)-1])
+	}
+	return pdDDLIds, nil
+}
+
+func checkSameCluster(ctx context.Context, db *sql.DB, pdAddrs []string) (bool, error) {
+	cli, err := clientv3.New(clientv3.Config{
+		Endpoints:   pdAddrs,
+		DialTimeout: defaultEtcdDialTimeOut,
+	})
+	if err != nil {
+		return false, err
+	}
+	tidbDDLIDs, err := GetTiDBDDLIDs(db)
+	if err != nil {
+		return false, err
+	}
+	pdDDLIDs, err := GetPdDDLIDs(ctx, cli)
+	if err != nil {
+		return false, err
+	}
+	sort.Strings(tidbDDLIDs)
+	sort.Strings(pdDDLIDs)
+
+	return sameStringArray(tidbDDLIDs, pdDDLIDs), nil
+}
+
+func sameStringArray(a, b []string) bool {
+	if len(a) != len(b) {
+		return false
+	}
+	for i := range a {
+		if a[i] != b[i] {
+			return false
+		}
+	}
+	return true
+}
diff --git a/v4/export/writer.go b/v4/export/writer.go
index 6f26201..3d70e0f 100644
--- a/v4/export/writer.go
+++ b/v4/export/writer.go
@@ -63,7 +63,7 @@ func (f *SimpleWriter) WriteTableData(ctx context.Context, ir TableDataIR) error
 	for {
 		filePath := path.Join(f.cfg.OutputDirPath, fileName)
 		fileWriter, tearDown := buildInterceptFileWriter(filePath)
-		err := WriteInsert(chunksIter, fileWriter)
+		err := WriteInsert(ctx, chunksIter, fileWriter)
 		tearDown()
 		if err != nil {
 			return err
@@ -151,7 +151,7 @@ func (f *CsvWriter) WriteTableData(ctx context.Context, ir TableDataIR) error {
 	for {
 		filePath := path.Join(f.cfg.OutputDirPath, fileName)
 		fileWriter, tearDown := buildInterceptFileWriter(filePath)
-		err := WriteInsertInCsv(chunksIter, fileWriter, f.cfg.NoHeader, f.cfg.CsvNullValue)
+		err := WriteInsertInCsv(ctx, chunksIter, fileWriter, f.cfg.NoHeader, f.cfg.CsvNullValue)
 		tearDown()
 		if err != nil {
 			return err
diff --git a/v4/export/writer_util.go b/v4/export/writer_util.go
index 6c40c2f..d2a20ee 100644
--- a/v4/export/writer_util.go
+++ b/v4/export/writer_util.go
@@ -89,7 +89,7 @@ func WriteMeta(meta MetaIR, w io.StringWriter) error {
 	return nil
 }
 
-func WriteInsert(tblIR TableDataIR, w io.Writer) error {
+func WriteInsert(pCtx context.Context, tblIR TableDataIR, w io.Writer) error {
 	fileRowIter := tblIR.Rows()
 	if !fileRowIter.HasNext() {
 		return nil
@@ -166,8 +166,12 @@ func WriteInsert(tblIR TableDataIR, w io.Writer) error {
 				bf.WriteString(";\n")
 			}
 
-			if err = wp.Error(); err != nil {
+			select {
+			case <-pCtx.Done():
+				return pCtx.Err()
+			case err := <-wp.errCh:
 				return err
+			default:
 			}
 		}
 	}
@@ -185,7 +189,7 @@ func WriteInsert(tblIR TableDataIR, w io.Writer) error {
 	return wp.Error()
 }
 
-func WriteInsertInCsv(tblIR TableDataIR, w io.Writer, noHeader bool, csvNullValue string) error {
+func WriteInsertInCsv(pCtx context.Context, tblIR TableDataIR, w io.Writer, noHeader bool, csvNullValue string) error {
 	fileRowIter := tblIR.Rows()
 	if !fileRowIter.HasNext() {
 		return nil
@@ -250,8 +254,13 @@ func WriteInsertInCsv(tblIR TableDataIR, w io.Writer, noHeader bool, csvNullValu
 
 			fileRowIter.Next()
 			bf.WriteByte('\n')
-			if err = wp.Error(); err != nil {
+
+			select {
+			case <-pCtx.Done():
+				return pCtx.Err()
+			case err := <-wp.errCh:
 				return err
+			default:
 			}
 		}
 	}


Test patch:
diff --git a/v4/export/writer_util_test.go b/v4/export/writer_util_test.go
index 7c9d879..50c708f 100644
--- a/v4/export/writer_util_test.go
+++ b/v4/export/writer_util_test.go
@@ -2,6 +2,7 @@ package export
 
 import (
 	"bytes"
+	"context"
 	"errors"
 	"fmt"
 	"strings"
@@ -60,7 +61,7 @@ func (s *testUtilSuite) TestWriteInsert(c *C) {
 	tableIR := newMockTableIR("test", "employee", data, specCmts, colTypes)
 	bf := &bytes.Buffer{}
 
-	err := WriteInsert(tableIR, bf)
+	err := WriteInsert(context.Background(), tableIR, bf)
 	c.Assert(err, IsNil)
 	expected := "/*!40101 SET NAMES binary*/;\n" +
 		"/*!40014 SET FOREIGN_KEY_CHECKS=0*/;\n" +
@@ -89,7 +90,7 @@ func (s *testUtilSuite) TestWriteInsertReturnsError(c *C) {
 	tableIR := newMockTableIRWithError("test", "employee", data, specCmts, colTypes, rowErr)
 	bf := &bytes.Buffer{}
 
-	err := WriteInsert(tableIR, bf)
+	err := WriteInsert(context.Background(), tableIR, bf)
 	c.Assert(err, Equals, rowErr)
 	expected := "/*!40101 SET NAMES binary*/;\n" +
 		"/*!40014 SET FOREIGN_KEY_CHECKS=0*/;\n" +
@@ -111,7 +112,7 @@ func (s *testUtilSuite) TestWriteInsertInCsv(c *C) {
 	tableIR := newMockTableIR("test", "employee", data, nil, colTypes)
 	bf := &bytes.Buffer{}
 
-	err := WriteInsertInCsv(tableIR, bf, true, "\\N")
+	err := WriteInsertInCsv(context.Background(), tableIR, bf, true, "\\N")
 	c.Assert(err, IsNil)
 	expected := "1,\"male\",\"bob@mail.com\",\"020-1234\",\\N\n" +
 		"2,\"female\",\"sarah@mail.com\",\"020-1253\",\"healthy\"\n" +
@@ -135,7 +136,7 @@ func (s *testUtilSuite) TestSQLDataTypes(c *C) {
 		tableIR := newMockTableIR("test", "t", tableData, nil, colType)
 		bf := &bytes.Buffer{}
 
-		err := WriteInsert(tableIR, bf)
+		err := WriteInsert(context.Background(), tableIR, bf)
 		c.Assert(err, IsNil)
 		lines := strings.Split(bf.String(), "\n")
 		c.Assert(len(lines), Equals, 3)