Repository: pingcap/dumpling
Pull request #182 (2020-11-03 08:47:58)

add retry mechanism
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### What problem does this PR solve? <!--add issue link with summary if exists-->
https://github.com/pingcap/dumpling/issues/178
https://github.com/pingcap/dumpling/issues/180

### What is changed and how it works?
1. Retry dumping on failed chunks.
2. Increase `maxIdleConnsPerHost` when `config.Threads` is set. Reference: https://github.com/RedTeamPentesting/monsoon/pull/3/files#diff-3ad9aea5b78bcb9b0ca9164d4cd81a2c462dbc82d2a3e7b5477f66134c65e05cR52

### Check List <!--REMOVE the items that are not applicable-->

Tests <!-- At least one of them must be included. -->

 - Unit test
 - Integration test

Side effects

 - Possible performance regression

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
-->
- Retry dumping on failed chunks.

lichunzhu: DNM now. Manual test shows some bugs
lichunzhu: I have tested using `lldb` to kill several socket connections while dumping. Dumpling works fine even in this situation.
mightyguava: Yes, I built dumpling from db9e82708dfa5fa0f4bbb40eab65fab4ed708be1

Patch:
diff --git a/go.mod b/go.mod
index dd4d0d4..6866105 100644
--- a/go.mod
+++ b/go.mod
@@ -7,21 +7,24 @@ 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/pingcap/br v0.0.0-20200925095602-bf9cc603382e
+	github.com/mattn/go-colorable v0.1.7 // indirect
+	github.com/mattn/go-runewidth v0.0.9 // indirect
+	github.com/pingcap/br v0.0.0-20201027124415-c2ed897feada
 	github.com/pingcap/check v0.0.0-20200212061837-5e12011dc712
-	github.com/pingcap/errors v0.11.5-0.20200902104258-eba4f1d8f6de
+	github.com/pingcap/errors v0.11.5-0.20200917111840-a15ef68f753d
 	github.com/pingcap/failpoint v0.0.0-20200702092429-9f69995143ce
-	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/pingcap/tidb-tools v4.0.8-0.20200927084250-e47e0e12c7f3+incompatible
 	github.com/pkg/errors v0.9.1
 	github.com/soheilhy/cmux v0.1.4
 	github.com/spf13/pflag v1.0.5
-	github.com/tikv/pd v1.1.0-beta.0.20200825070655-6b09f3acbb1f
-	go.etcd.io/etcd v0.5.0-alpha.5.0.20191023171146-3cf2f69b5738
+	github.com/tikv/pd v1.1.0-beta.0.20200910042021-254d1345be09
+	go.etcd.io/etcd v0.5.0-alpha.5.0.20200824191128-ae9734ed278b
 	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
 	golang.org/x/tools v0.0.0-20200823205832-c024452afbcd // indirect
+	golang.org/x/xerrors v0.0.0-20200804184101-5ec99f83aff1 // indirect
+	gopkg.in/yaml.v2 v2.3.0 // indirect
 )
diff --git a/go.sum b/go.sum
index 5613f56..70ec536 100644
--- a/go.sum
+++ b/go.sum
@@ -8,24 +8,40 @@ cloud.google.com/go v0.45.1/go.mod h1:RpBamKRgapWJb87xiFSdk4g1CME7QZg3uwTez+TSTj
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+cloud.google.com/go v0.52.0/go.mod h1:pXajvRH/6o3+F9jDHZWQ5PbGhn+o8w9qiu/CffaVdO4=
+cloud.google.com/go v0.53.0 h1:MZQCQQaRwOrAcuKjiHWHrgKykt4fZyuwF2dtiG3fGW8=
+cloud.google.com/go v0.53.0/go.mod h1:fp/UouUEsRkN6ryDKNW/Upv/JBKnv6WDthjR6+vze6M=
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+cloud.google.com/go/bigquery v1.4.0 h1:xE3CPsOgttP4ACBePh79zTKALtXwn/Edhcr16R5hMWU=
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+cloud.google.com/go/datastore v1.1.0 h1:/May9ojXjRkPBNVrq+oWLqmWCkr4OU5uRY29bu0mRyQ=
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+cloud.google.com/go/pubsub v1.2.0 h1:Lpy6hKgdcl7a3WGSfJIFmxmcdjSpP6OmBEfcOv1Y680=
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+cloud.google.com/go/storage v1.6.0 h1:UDpwYIwla4jHGzZJaEJYx1tOejbgSoNqsAfHAUYe2r8=
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 github.com/DATA-DOG/go-sqlmock v1.4.1 h1:ThlnYciV1iM/V0OSF/dtkqWb6xo5qITT1TJBG1MRDJM=
 github.com/DATA-DOG/go-sqlmock v1.4.1/go.mod h1:f/Ixk793poVmq4qj/V1dPUg2JEAKC73Q5eFN3EC/SaM=
+github.com/Jeffail/gabs/v2 v2.5.1 h1:ANfZYjpMlfTTKebycu4X1AgkVWumFVDYQl7JwOr4mDk=
 github.com/Jeffail/gabs/v2 v2.5.1/go.mod h1:xCn81vdHKxFUuWWAaD5jCTQDNPBMh5pPs9IJ+NcziBI=
 github.com/KyleBanks/depth v1.2.1 h1:5h8fQADFrWtarTdtDudMmGsC7GPbOAu6RVB3ffsVFHc=
 github.com/KyleBanks/depth v1.2.1/go.mod h1:jzSb9d0L43HxTQfT+oSA1EEp2q+ne2uh6XgeJcm8brE=
+github.com/OneOfOne/xxhash v1.2.2 h1:KMrpdQIwFcEqXDklaen+P1axHaj9BSKzvpUUfnHldSE=
 github.com/OneOfOne/xxhash v1.2.2/go.mod h1:HSdplMjZKSmBqAxg5vPj2TmRDmfkzw+cTzAElWljhcU=
 github.com/PuerkitoBio/purell v1.1.0/go.mod h1:c11w/QuzBsJSee3cPx9rAFu61PvFxuPbtSwDGJws/X0=
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@@ -36,6 +52,7 @@ github.com/StackExchange/wmi v0.0.0-20190523213315-cbe66965904d h1:G0m3OIz70MZUW
 github.com/StackExchange/wmi v0.0.0-20190523213315-cbe66965904d/go.mod h1:3eOhrUMpNV+6aFIbp5/iudMxNCF27Vw2OZgy4xEx0Fg=
 github.com/VividCortex/ewma v1.1.1 h1:MnEK4VOv6n0RSY4vtRe3h11qjxL3+t0B8yOL8iMXdcM=
 github.com/VividCortex/ewma v1.1.1/go.mod h1:2Tkkvm3sRDVXaiyucHiACn4cqf7DpdyLvmxzcbUokwA=
+github.com/VividCortex/mysqlerr v0.0.0-20200629151747-c28746d985dd/go.mod h1:f3HiCrHjHBdcm6E83vGaXh1KomZMA2P6aeo3hKx/wg0=
 github.com/alecthomas/template v0.0.0-20160405071501-a0175ee3bccc/go.mod h1:LOuyumcjzFXgccqObfd/Ljyb9UuFJ6TxHnclSeseNhc=
 github.com/alecthomas/template v0.0.0-20190718012654-fb15b899a751/go.mod h1:LOuyumcjzFXgccqObfd/Ljyb9UuFJ6TxHnclSeseNhc=
 github.com/alecthomas/units v0.0.0-20151022065526-2efee857e7cf/go.mod h1:ybxpYRFXyAe+OPACYpWeL0wqObRcbAqCMya13uyzqw0=
@@ -44,22 +61,21 @@ github.com/antihax/optional v0.0.0-20180407024304-ca021399b1a6/go.mod h1:V8iCPQY
 github.com/appleboy/gin-jwt/v2 v2.6.3/go.mod h1:MfPYA4ogzvOcVkRwAxT7quHOtQmVKDpTwxyUrC2DNw0=
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 github.com/armon/consul-api v0.0.0-20180202201655-eb2c6b5be1b6/go.mod h1:grANhF5doyWs3UAsr3K4I6qtAmlQcZDesFNEHPZAzj8=
-github.com/aws/aws-sdk-go v1.19.10 h1:WHIaUrU98WsWIXxlxeMCmbuB5HowxuUnk8eBH4iGl/g=
-github.com/aws/aws-sdk-go v1.19.10/go.mod h1:KmX6BPdI08NWTb3/sm4ZGu5ShLoqVDhKgpiN924inxo=
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-github.com/aws/aws-sdk-go v1.34.25 h1:yHNez503p+NuQ5QdMKjwEIkwTa2u+TeUAPAqCVdFu4I=
-github.com/aws/aws-sdk-go v1.34.25/go.mod h1:5zCpMtNQVjRREroY7sYe8lOMRSxkhG6MZveU8YkpAk0=
+github.com/aws/aws-sdk-go v1.35.2 h1:qK+noh6b9KW+5CP1NmmWsQCUbnzucSGrjHEs69MEl6A=
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-github.com/c2fo/vfs/v5 v5.5.4 h1:NNfNJA4thbMzrxN4MzVQttQyWkY/U2MW8SVOUIriHKs=
-github.com/c2fo/vfs/v5 v5.5.4/go.mod h1:62NkBSss3QjWL+4t/TgCuf6WTfBtq1qWTn3Y+1aIIu4=
+github.com/cakturk/go-netstat v0.0.0-20200220111822-e5b49efee7a5 h1:BjkPE3785EwPhhyuFkbINB+2a1xATwk8SNDWnJiD41g=
+github.com/cakturk/go-netstat v0.0.0-20200220111822-e5b49efee7a5/go.mod h1:jtAfVaU/2cu1+wdSRPWE2c1N2qeAA3K4RH9pYgqwets=
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@@ -76,10 +92,13 @@ github.com/chzyer/test v0.0.0-20180213035817-a1ea475d72b1/go.mod h1:Q3SI9o4m/ZMn
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@@ -147,7 +166,10 @@ github.com/fogleman/gg v1.3.0/go.mod h1:R/bRT+9gY/C5z7JzPU0zXsXHKM4/ayA+zqcVNZzP
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@@ -162,6 +184,7 @@ github.com/go-bindata/go-bindata/v3 v3.1.3/go.mod h1:1/zrpXsLD8YDIbhZRqXzm1Ghc7N
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@@ -214,14 +237,21 @@ github.com/golang/groupcache v0.0.0-20190129154638-5b532d6fd5ef/go.mod h1:cIg4er
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@@ -234,6 +264,7 @@ github.com/google/go-cmp v0.2.0 h1:+dTQ8DZQJz0Mb/HjFlkptS1FeQ4cWSnN941F8aEG4SQ=
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@@ -241,6 +272,8 @@ github.com/google/martian v2.1.0+incompatible/go.mod h1:9I4somxYTbIHy5NJKHRl3wXi
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@@ -249,16 +282,19 @@ github.com/google/uuid v1.0.0 h1:b4Gk+7WdP/d3HZH8EJsZpvV7EtDOgaZLtnaNGIu1adA=
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@@ -291,6 +327,10 @@ github.com/jmespath/go-jmespath v0.0.0-20180206201540-c2b33e8439af h1:pmfjZENx5i
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@@ -305,13 +345,16 @@ github.com/jstemmer/go-junit-report v0.9.1 h1:6QPYqodiu3GuPL+7mfx+NwDdp2eTkp9IfE
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@@ -320,6 +363,7 @@ github.com/kevinburke/go-bindata v3.18.0+incompatible/go.mod h1:/pEEZ72flUW2p0yi
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@@ -330,8 +374,6 @@ github.com/konsorten/go-windows-terminal-sequences v1.0.1/go.mod h1:T0+1ngSBFLxv
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@@ -349,14 +391,12 @@ github.com/mailru/easyjson v0.0.0-20190626092158-b2ccc519800e h1:hB2xlXdHp/pmPZq
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@@ -391,8 +431,10 @@ github.com/modern-go/reflect2 v1.0.1/go.mod h1:bx2lNnkwVCuqBIxFjflWJWanXIb3Rllmb
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@@ -565,8 +620,6 @@ github.com/pkg/errors v0.8.0/go.mod h1:bwawxfHBFNV+L2hUp1rHADufV3IMtnDRdf1r5NINE
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@@ -615,11 +668,13 @@ github.com/shirou/gopsutil v2.19.10+incompatible h1:lA4Pi29JEVIQIgATSeftHSY0rMGI
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@@ -628,6 +683,7 @@ github.com/sirupsen/logrus v1.6.0 h1:UBcNElsrwanuuMsnGSlYmtmgbb23qDR5dG+6X6Oo89I
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@@ -667,17 +723,19 @@ github.com/syndtr/goleveldb v0.0.0-20180815032940-ae2bd5eed72d h1:4J9HCZVpvDmj2t
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@@ -703,6 +761,9 @@ github.com/urfave/cli v1.22.2/go.mod h1:Gos4lmkARVdJ6EkW0WaNv/tZAAMe9V7XWyB60NtX
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@@ -712,6 +773,7 @@ github.com/yuin/goldmark v1.1.25/go.mod h1:3hX8gzYuyVAZsxl0MRgGTJEmQBFcNTphYh9de
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@@ -721,11 +783,15 @@ go.etcd.io/bbolt v1.3.5/go.mod h1:G5EMThwa9y8QZGBClrRx5EY+Yw9kAhnjy3bSjsnlVTQ=
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+go.opencensus.io v0.22.3 h1:8sGtKOrtQqkN1bp2AtX+misvLIlOmsEsNd+9NIcPEm8=
+go.opencensus.io v0.22.3/go.mod h1:yxeiOL68Rb0Xd1ddK5vPZ/oVn4vY4Ynel7k9FzqtOIw=
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@@ -780,6 +846,10 @@ golang.org/x/exp v0.0.0-20191030013958-a1ab85dbe136/go.mod h1:JXzH8nQsPlswgeRAPE
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+golang.org/x/exp v0.0.0-20200119233911-0405dc783f0a/go.mod h1:2RIsYlXP63K8oxa1u096TMicItID8zy7Y6sNkU49FU4=
+golang.org/x/exp v0.0.0-20200207192155-f17229e696bd/go.mod h1:J/WKrq2StrnmMY6+EHIKF9dgMWnmCNThgcyBT1FY9mM=
+golang.org/x/exp v0.0.0-20200224162631-6cc2880d07d6 h1:QE6XYQK6naiK1EPAe1g/ILLxN5RBoH5xkJk3CqlMI/Y=
+golang.org/x/exp v0.0.0-20200224162631-6cc2880d07d6/go.mod h1:3jZMyOhIsHpP37uCMkUooju7aAi5cS1Q23tOzKc+0MU=
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@@ -793,6 +863,7 @@ golang.org/x/lint v0.0.0-20190930215403-16217165b5de h1:5hukYrvBGR8/eNkX5mdUezrA
 golang.org/x/lint v0.0.0-20190930215403-16217165b5de/go.mod h1:6SW0HCj/g11FgYtHlgUYUwCkIfeOF89ocIRzGO/8vkc=
 golang.org/x/lint v0.0.0-20191125180803-fdd1cda4f05f h1:J5lckAjkw6qYlOZNj90mLYNTEKDvWeuc1yieZ8qUzUE=
 golang.org/x/lint v0.0.0-20191125180803-fdd1cda4f05f/go.mod h1:5qLYkcX4OjUUV8bRuDixDT3tpyyb+LUpUlRWLxfhWrs=
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 golang.org/x/lint v0.0.0-20200302205851-738671d3881b h1:Wh+f8QHJXR411sJR8/vRBTZ7YapZaRvUcLFFJhusH0k=
 golang.org/x/lint v0.0.0-20200302205851-738671d3881b/go.mod h1:3xt1FjdF8hUf6vQPIChWIBhFzV8gjjsPE/fR3IyQdNY=
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@@ -800,6 +871,7 @@ golang.org/x/mobile v0.0.0-20190719004257-d2bd2a29d028/go.mod h1:E/iHnbuqvinMTCc
 golang.org/x/mod v0.0.0-20190513183733-4bf6d317e70e/go.mod h1:mXi4GBBbnImb6dmsKGUJ2LatrhH/nqhxcFungHvyanc=
 golang.org/x/mod v0.1.0/go.mod h1:0QHyrYULN0/3qlju5TqG8bIK38QM8yzMo5ekMj3DlcY=
 golang.org/x/mod v0.1.1-0.20191105210325-c90efee705ee/go.mod h1:QqPTAvyqsEbceGzBzNggFXnrqF1CaUcvgkdR5Ot7KZg=
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 golang.org/x/mod v0.2.0 h1:KU7oHjnv3XNWfa5COkzUifxZmxp1TyI7ImMXqFxLwvQ=
 golang.org/x/mod v0.2.0/go.mod h1:s0Qsj1ACt9ePp/hMypM3fl4fZqREWJwdYDEqhRiZZUA=
 golang.org/x/mod v0.3.0 h1:RM4zey1++hCTbCVQfnWeKs9/IEsaBLA8vTkd0WVtmH4=
@@ -828,8 +900,11 @@ golang.org/x/net v0.0.0-20190813141303-74dc4d7220e7/go.mod h1:z5CRVTTTmAJ677TzLL
 golang.org/x/net v0.0.0-20190827160401-ba9fcec4b297/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
 golang.org/x/net v0.0.0-20191002035440-2ec189313ef0/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
 golang.org/x/net v0.0.0-20191209160850-c0dbc17a3553/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
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 golang.org/x/net v0.0.0-20200202094626-16171245cfb2/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
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 golang.org/x/net v0.0.0-20200226121028-0de0cce0169b/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
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 golang.org/x/net v0.0.0-20200324143707-d3edc9973b7e/go.mod h1:qpuaurCH72eLCgpAm/N6yyVIVM9cpaDIP3A8BGJEC5A=
 golang.org/x/net v0.0.0-20200520182314-0ba52f642ac2/go.mod h1:qpuaurCH72eLCgpAm/N6yyVIVM9cpaDIP3A8BGJEC5A=
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@@ -838,11 +913,11 @@ golang.org/x/net v0.0.0-20200822124328-c89045814202 h1:VvcQYSHwXgi7W+TpUR6A9g6Up
 golang.org/x/net v0.0.0-20200822124328-c89045814202/go.mod h1:/O7V0waA8r7cgGh81Ro3o1hOxt32SMVPicZroKQ2sZA=
 golang.org/x/oauth2 v0.0.0-20180821212333-d2e6202438be/go.mod h1:N/0e6XlmueqKjAGxoOufVs8QHGRruUQn6yWY3a++T0U=
 golang.org/x/oauth2 v0.0.0-20190226205417-e64efc72b421/go.mod h1:gOpvHmFTYa4IltrdGE7lF6nIHvwfUNPOp7c8zoXwtLw=
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 golang.org/x/oauth2 v0.0.0-20190604053449-0f29369cfe45/go.mod h1:gOpvHmFTYa4IltrdGE7lF6nIHvwfUNPOp7c8zoXwtLw=
 golang.org/x/oauth2 v0.0.0-20191202225959-858c2ad4c8b6 h1:pE8b58s1HRDMi8RDc79m0HISf9D4TzseP40cEA6IGfs=
 golang.org/x/oauth2 v0.0.0-20191202225959-858c2ad4c8b6/go.mod h1:gOpvHmFTYa4IltrdGE7lF6nIHvwfUNPOp7c8zoXwtLw=
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 golang.org/x/sync v0.0.0-20180314180146-1d60e4601c6f/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
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@@ -875,20 +950,24 @@ golang.org/x/sys v0.0.0-20190626221950-04f50cda93cb/go.mod h1:h1NjWce9XRLGQEsW7w
 golang.org/x/sys v0.0.0-20190726091711-fc99dfbffb4e/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20190813064441-fde4db37ae7a/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20190826190057-c7b8b68b1456/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
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 golang.org/x/sys v0.0.0-20191026070338-33540a1f6037/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
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 golang.org/x/sys v0.0.0-20200819171115-d785dc25833f/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20200824131525-c12d262b63d8 h1:AvbQYmiaaaza3cW3QXRyPo5kYgpFIzOAfeAAN7m3qQ4=
 golang.org/x/sys v0.0.0-20200824131525-c12d262b63d8/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/text v0.0.0-20170915032832-14c0d48ead0c/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
 golang.org/x/text v0.3.0 h1:g61tztE5qeGQ89tm6NTjjM9VPIm088od1l6aSorWRWg=
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@@ -901,6 +980,8 @@ golang.org/x/time v0.0.0-20180412165947-fbb02b2291d2/go.mod h1:tRJNPiyCQ0inRvYxb
 golang.org/x/time v0.0.0-20181108054448-85acf8d2951c/go.mod h1:tRJNPiyCQ0inRvYxbN9jk5I+vvW/OXSQhTDSoE431IQ=
 golang.org/x/time v0.0.0-20190308202827-9d24e82272b4 h1:SvFZT6jyqRaOeXpc5h/JSfZenJ2O330aBsf7JfSUXmQ=
 golang.org/x/time v0.0.0-20190308202827-9d24e82272b4/go.mod h1:tRJNPiyCQ0inRvYxbN9jk5I+vvW/OXSQhTDSoE431IQ=
+golang.org/x/time v0.0.0-20191024005414-555d28b269f0 h1:/5xXl8Y5W96D+TtHSlonuFqGHIWVuyCkGJLwGh9JJFs=
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 golang.org/x/tools v0.0.0-20180221164845-07fd8470d635/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=
 golang.org/x/tools v0.0.0-20180917221912-90fa682c2a6e/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=
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@@ -934,7 +1015,13 @@ golang.org/x/tools v0.0.0-20191125144606-a911d9008d1f/go.mod h1:b+2E5dAYhXwXZwtn
 golang.org/x/tools v0.0.0-20191130070609-6e064ea0cf2d/go.mod h1:b+2E5dAYhXwXZwtnZ6UAqBI28+e2cm9otk0dWdXHAEo=
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@@ -950,8 +1037,6 @@ golang.org/x/xerrors v0.0.0-20191204190536-9bdfabe68543/go.mod h1:I/5z698sn9Ka8T
 golang.org/x/xerrors v0.0.0-20200804184101-5ec99f83aff1 h1:go1bK/D/BFZV2I8cIQd1NKEZ+0owSTG1fDTci4IqFcE=
 golang.org/x/xerrors v0.0.0-20200804184101-5ec99f83aff1/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
 google.golang.org/api v0.4.0/go.mod h1:8k5glujaEP+g9n7WNsDg8QP6cUVNI86fCNMcbazEtwE=
-google.golang.org/api v0.5.0 h1:lj9SyhMzyoa38fgFF0oO2T6pjs5IzkLPKfVtxpyCRMM=
-google.golang.org/api v0.5.0/go.mod h1:8k5glujaEP+g9n7WNsDg8QP6cUVNI86fCNMcbazEtwE=
 google.golang.org/api v0.7.0/go.mod h1:WtwebWUNSVBH/HAw79HIFXZNqEvBhG+Ra+ax0hx3E3M=
 google.golang.org/api v0.8.0/go.mod h1:o4eAsZoiT+ibD93RtjEohWalFOjRDx6CVaqeizhEnKg=
 google.golang.org/api v0.9.0/go.mod h1:o4eAsZoiT+ibD93RtjEohWalFOjRDx6CVaqeizhEnKg=
@@ -960,6 +1045,10 @@ google.golang.org/api v0.14.0/go.mod h1:iLdEw5Ide6rF15KTC1Kkl0iskquN2gFfn9o9XIsb
 google.golang.org/api v0.15.0/go.mod h1:iLdEw5Ide6rF15KTC1Kkl0iskquN2gFfn9o9XIsbkAI=
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 google.golang.org/api v0.15.1/go.mod h1:iLdEw5Ide6rF15KTC1Kkl0iskquN2gFfn9o9XIsbkAI=
+google.golang.org/api v0.17.0/go.mod h1:BwFmGc8tA3vsd7r/7kR8DY7iEEGSU04BFxCo5jP/sfE=
+google.golang.org/api v0.18.0/go.mod h1:BwFmGc8tA3vsd7r/7kR8DY7iEEGSU04BFxCo5jP/sfE=
+google.golang.org/api v0.22.0 h1:J1Pl9P2lnmYFSJvgs70DKELqHNh8CNWXPbud4njEE2s=
+google.golang.org/api v0.22.0/go.mod h1:BwFmGc8tA3vsd7r/7kR8DY7iEEGSU04BFxCo5jP/sfE=
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@@ -974,7 +1063,6 @@ google.golang.org/genproto v0.0.0-20190307195333-5fe7a883aa19/go.mod h1:VzzqZJRn
 google.golang.org/genproto v0.0.0-20190418145605-e7d98fc518a7/go.mod h1:VzzqZJRnGkLBvHegQrXjBqPurQTc5/KpmUdxsrq26oE=
 google.golang.org/genproto v0.0.0-20190425155659-357c62f0e4bb/go.mod h1:VzzqZJRnGkLBvHegQrXjBqPurQTc5/KpmUdxsrq26oE=
 google.golang.org/genproto v0.0.0-20190502173448-54afdca5d873/go.mod h1:VzzqZJRnGkLBvHegQrXjBqPurQTc5/KpmUdxsrq26oE=
-google.golang.org/genproto v0.0.0-20190516172635-bb713bdc0e52/go.mod h1:z3L6/3dTEVtUr6QSP8miRzeRqwQOioJ9I66odjN4I7s=
 google.golang.org/genproto v0.0.0-20190801165951-fa694d86fc64/go.mod h1:DMBHOl98Agz4BDEuKkezgsaosCRResVns1a3J2ZsMNc=
 google.golang.org/genproto v0.0.0-20190819201941-24fa4b261c55/go.mod h1:DMBHOl98Agz4BDEuKkezgsaosCRResVns1a3J2ZsMNc=
 google.golang.org/genproto v0.0.0-20190911173649-1774047e7e51/go.mod h1:IbNlFCBrqXvoKpeg0TB2l7cyZUmoaFKYIwrEpbDKLA8=
@@ -985,6 +1073,12 @@ google.golang.org/genproto v0.0.0-20191115194625-c23dd37a84c9/go.mod h1:n3cpQtvx
 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/genproto v0.0.0-20200115191322-ca5a22157cba/go.mod h1:n3cpQtvxv34hfy77yVDNjmbRyujviMdxYliBSkLhpCc=
+google.golang.org/genproto v0.0.0-20200122232147-0452cf42e150/go.mod h1:n3cpQtvxv34hfy77yVDNjmbRyujviMdxYliBSkLhpCc=
+google.golang.org/genproto v0.0.0-20200204135345-fa8e72b47b90/go.mod h1:GmwEX6Z4W5gMy59cAlVYjN9JhxgbQH6Gn+gFDQe2lzA=
+google.golang.org/genproto v0.0.0-20200212174721-66ed5ce911ce/go.mod h1:55QSHmfGQM9UVYDPBsyGGes0y52j32PQ3BqQfXhyH3c=
+google.golang.org/genproto v0.0.0-20200224152610-e50cd9704f63 h1:YzfoEYWbODU5Fbt37+h7X16BWQbad7Q4S6gclTKFXM8=
+google.golang.org/genproto v0.0.0-20200224152610-e50cd9704f63/go.mod h1:55QSHmfGQM9UVYDPBsyGGes0y52j32PQ3BqQfXhyH3c=
 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=
@@ -997,6 +1091,9 @@ 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=
+google.golang.org/grpc v1.27.0/go.mod h1:qbnxyOmOxrQa7FizSgH+ReBfzJrCY1pSN7KXBS8abTk=
+google.golang.org/grpc v1.27.1 h1:zvIju4sqAGvwKspUQOhwnpcqSbzi7/H6QomNNjTL4sk=
+google.golang.org/grpc v1.27.1/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=
@@ -1014,6 +1111,7 @@ gopkg.in/go-playground/assert.v1 v1.2.1/go.mod h1:9RXL0bg/zibRAgZUYszZSwO/z8Y/a8
 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 h1:hILp2hNrRnYjZpmIbx70psAHbBSEcQ1NIzDcUbJ1b6g=
 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=
@@ -1045,8 +1143,11 @@ honnef.co/go/tools v0.0.1-2020.1.5 h1:nI5egYTGJakVyOryqLs1cQO5dO0ksin5XXs2pspk75
 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=
+rsc.io/quote/v3 v3.1.0/go.mod h1:yEA65RcK8LyAZtP9Kv3t0HmxON59tX3rD+tICJqUlj0=
+rsc.io/sampler v1.3.0/go.mod h1:T1hPZKmBbMNahiBKFy5HrXp6adAjACjK9JXDnKaTXpA=
 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 h1:e1sMhtVq9AfcEy8AXNb8eSg6gbzfdpYhoNqnPJa+GzI=
 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 96f4b8f..2d97e19 100644
--- a/v4/export/config.go
+++ b/v4/export/config.go
@@ -4,6 +4,7 @@ import (
 	"context"
 	"encoding/json"
 	"fmt"
+	"net/http"
 	"regexp"
 	"strings"
 	"text/template"
@@ -133,7 +134,19 @@ func (config *Config) createExternalStorage(ctx context.Context) (storage.Extern
 	if err != nil {
 		return nil, err
 	}
-	return storage.Create(ctx, b, false)
+	httpClient := http.DefaultClient
+	httpClient.Timeout = 30 * time.Second
+	maxIdleConnsPerHost := http.DefaultMaxIdleConnsPerHost
+	if config.Threads > maxIdleConnsPerHost {
+		maxIdleConnsPerHost = config.Threads
+	}
+	transport := http.DefaultTransport.(*http.Transport).Clone()
+	transport.MaxIdleConnsPerHost = maxIdleConnsPerHost
+	httpClient.Transport = transport
+
+	return storage.New(ctx, b, &storage.ExternalStorageOptions{
+		HTTPClient: httpClient,
+	})
 }
 
 const (
diff --git a/v4/export/dump.go b/v4/export/dump.go
index b773277..dbf5922 100755
--- a/v4/export/dump.go
+++ b/v4/export/dump.go
@@ -11,6 +11,7 @@ import (
 	"github.com/pingcap/dumpling/v4/log"
 
 	_ "github.com/go-sql-driver/mysql"
+	"github.com/pingcap/br/pkg/utils"
 	"github.com/pingcap/failpoint"
 	pd "github.com/tikv/pd/client"
 	"go.uber.org/zap"
@@ -233,9 +234,9 @@ func Dump(pCtx context.Context, conf *Config) (err error) {
 	return nil
 }
 
-func dumpDatabases(ctx context.Context, conf *Config, connectPool *connectionsPool, writer Writer) error {
+func dumpDatabases(pCtx context.Context, conf *Config, connectPool *connectionsPool, writer Writer) error {
 	allTables := conf.Tables
-	var g errgroup.Group
+	g, ctx := errgroup.WithContext(pCtx)
 	for dbName, tables := range allTables {
 		conn := connectPool.getConn()
 		createDatabaseSQL, err := ShowCreateDatabase(conn, dbName)
@@ -261,21 +262,24 @@ func dumpDatabases(ctx context.Context, conf *Config, connectPool *connectionsPo
 			for _, tableIR := range tableDataIRArray {
 				tableIR := tableIR
 				g.Go(func() error {
-					conn := connectPool.getConn()
-					defer connectPool.releaseConn(conn)
-					err := tableIR.Start(ctx, conn)
-					if err != nil {
-						return err
-					}
-					return writer.WriteTableData(ctx, tableIR)
+					retryTime := 1
+					return utils.WithRetry(ctx, func() error {
+						log.Debug("trying to dump table chunk", zap.Int("retryTime", retryTime), zap.String("db", tableIR.DatabaseName()),
+							zap.String("table", tableIR.TableName()), zap.Int("chunkIndex", tableIR.ChunkIndex()))
+						conn := connectPool.getConn()
+						defer connectPool.releaseConn(conn)
+						retryTime += 1
+						err := tableIR.Start(ctx, conn)
+						if err != nil {
+							return err
+						}
+						return writer.WriteTableData(ctx, tableIR)
+					}, newDumpChunkBackoffer())
 				})
 			}
 		}
 	}
-	if err := g.Wait(); err != nil {
-		return err
-	}
-	return nil
+	return g.Wait()
 }
 
 func prepareTableListToDump(conf *Config, pool *sql.Conn) error {
diff --git a/v4/export/ir_impl.go b/v4/export/ir_impl.go
index 07c2c5c..0db70ca 100644
--- a/v4/export/ir_impl.go
+++ b/v4/export/ir_impl.go
@@ -95,6 +95,7 @@ func (td *tableData) Start(ctx context.Context, conn *sql.Conn) error {
 	if err != nil {
 		return err
 	}
+	td.SQLRowIter = nil
 	td.rows = rows
 	return nil
 }
@@ -219,7 +220,7 @@ func splitTableDataIntoChunks(
 	}
 	// every chunk would have eventual adjustments
 	estimatedChunks := count / conf.Rows
-	estimatedStep := new(big.Int).Sub(max,min).Uint64() /estimatedChunks + 1
+	estimatedStep := new(big.Int).Sub(max, min).Uint64()/estimatedChunks + 1
 	bigEstimatedStep := new(big.Int).SetUint64(estimatedStep)
 	cutoff := new(big.Int).Set(min)
 	nextCutoff := new(big.Int)
@@ -246,7 +247,7 @@ func splitTableDataIntoChunks(
 LOOP:
 	for max.Cmp(cutoff) >= 0 {
 		chunkIndex += 1
-		where := fmt.Sprintf("%s(`%s` >= %d AND `%s` < %d)", nullValueCondition, escapeString(field), cutoff, escapeString(field), nextCutoff.Add(cutoff,bigEstimatedStep))
+		where := fmt.Sprintf("%s(`%s` >= %d AND `%s` < %d)", nullValueCondition, escapeString(field), cutoff, escapeString(field), nextCutoff.Add(cutoff, bigEstimatedStep))
 		query = buildSelectQuery(dbName, tableName, selectedField, buildWhereCondition(conf, where), orderByClause)
 		if len(nullValueCondition) > 0 {
 			nullValueCondition = ""
diff --git a/v4/export/retry.go b/v4/export/retry.go
new file mode 100644
index 0000000..894d704
--- /dev/null
+++ b/v4/export/retry.go
@@ -0,0 +1,47 @@
+package export
+
+import (
+	"time"
+
+	"github.com/go-sql-driver/mysql"
+	"github.com/pingcap/errors"
+	"github.com/pingcap/tidb-tools/pkg/dbutil"
+)
+
+const (
+	dumpChunkRetryTime       = 3
+	dumpChunkWaitInterval    = 50 * time.Millisecond
+	dumpChunkMaxWaitInterval = 200 * time.Millisecond
+)
+
+func newDumpChunkBackoffer() *dumpChunkBackoffer {
+	return &dumpChunkBackoffer{
+		attempt:      dumpChunkRetryTime,
+		delayTime:    dumpChunkWaitInterval,
+		maxDelayTime: dumpChunkMaxWaitInterval,
+	}
+}
+
+type dumpChunkBackoffer struct {
+	attempt      int
+	delayTime    time.Duration
+	maxDelayTime time.Duration
+}
+
+func (b *dumpChunkBackoffer) NextBackoff(err error) time.Duration {
+	err = errors.Cause(err)
+	if _, ok := err.(*mysql.MySQLError); ok && !dbutil.IsRetryableError(err) {
+		b.attempt = 0
+		return 0
+	}
+	b.delayTime = 2 * b.delayTime
+	b.attempt--
+	if b.delayTime > b.maxDelayTime {
+		return b.maxDelayTime
+	}
+	return b.delayTime
+}
+
+func (b *dumpChunkBackoffer) Attempt() int {
+	return b.attempt
+}
diff --git a/v4/export/writer_util.go b/v4/export/writer_util.go
index 2ea4e5a..149346e 100644
--- a/v4/export/writer_util.go
+++ b/v4/export/writer_util.go
@@ -402,7 +402,7 @@ func buildInterceptFileWriter(s storage.ExternalStorage, path string) (storage.W
 		if writer == nil {
 			return
 		}
-		log.Debug("tear down lazy file writer...")
+		log.Debug("tear down lazy file writer...", zap.String("path", fullPath))
 		err := writer.Close(ctx)
 		if err != nil {
 			log.Error("close file failed", zap.String("path", fullPath))


Test patch:
diff --git a/v4/export/dump_test.go b/v4/export/dump_test.go
index c87492f..8f9e542 100644
--- a/v4/export/dump_test.go
+++ b/v4/export/dump_test.go
@@ -7,6 +7,7 @@ import (
 	"strconv"
 
 	"github.com/DATA-DOG/go-sqlmock"
+	"github.com/go-sql-driver/mysql"
 	. "github.com/pingcap/check"
 )
 
@@ -195,3 +196,36 @@ func (s *testDumpSuite) TestDumpTableWhereClause(c *C) {
 	c.Assert(tbDataRes.Rows().HasNext(), IsFalse)
 	c.Assert(mock.ExpectationsWereMet(), IsNil)
 }
+
+func (s *testDumpSuite) TestDumpDatabaseWithRetry(c *C) {
+	mockConfig := DefaultConfig()
+	mockConfig.SortByPk = false
+	mockConfig.Databases = []string{"test"}
+	mockConfig.Tables = NewDatabaseTables().AppendTables("test", "t")
+	db, mock, err := sqlmock.New()
+	c.Assert(err, IsNil)
+
+	showCreateDatabase := "CREATE DATABASE `test`"
+	rows := mock.NewRows([]string{"Database", "Create Database"}).AddRow("test", showCreateDatabase)
+	mock.ExpectQuery("SHOW CREATE DATABASE `test`").WillReturnRows(rows)
+	showCreateTableResult := "CREATE TABLE t (a INT)"
+	rows = mock.NewRows([]string{"Table", "Create Table"}).AddRow("t", showCreateTableResult)
+	mock.ExpectQuery("SHOW CREATE TABLE `test`.`t`").WillReturnRows(rows)
+	rows = mock.NewRows([]string{"column_name", "extra"}).AddRow("id", "").AddRow("name", "")
+	mock.ExpectQuery("SELECT COLUMN_NAME").WithArgs(sqlmock.AnyArg(), sqlmock.AnyArg()).WillReturnRows(rows)
+	rows = mock.NewRows([]string{"a"}).AddRow(1)
+	mock.ExpectQuery("SELECT (.) FROM `test`.`t` LIMIT 1").WillReturnRows(rows)
+	rows = mock.NewRows([]string{"a"}).AddRow(1).AddRow(2)
+	mock.ExpectQuery("SELECT (.) FROM `test`.`t`").WillReturnError(&mysql.MySQLError{Number: 9001, Message: "pd is timeout"})
+	mock.ExpectQuery("SELECT (.) FROM `test`.`t`").WillReturnRows(rows)
+
+	mockWriter := newMockWriter()
+	connectPool := newMockConnectPool(c, db)
+	err = dumpDatabases(context.Background(), mockConfig, connectPool, mockWriter)
+	c.Assert(err, IsNil)
+
+	c.Assert(len(mockWriter.databaseMeta), Equals, 1)
+	c.Assert(mockWriter.databaseMeta["test"], Equals, "CREATE DATABASE `test`")
+	c.Assert(mockWriter.tableMeta["test.t"], Equals, showCreateTableResult)
+	c.Assert(mock.ExpectationsWereMet(), IsNil)
+}