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session, exectutor: Guarantee external consistency by default; Add an explicit begin statement to disable it #22597

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merged 20 commits into from
Feb 4, 2021
Merged

session, exectutor: Guarantee external consistency by default; Add an explicit begin statement to disable it #22597

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b1acc73
sessionctx: remove tidb_guarantee_external_consistency variable
ekexium Jan 27, 2021
1c75da5
replace pingcap/parser
ekexium Jan 28, 2021
8315d6e
executor: set external consistency option
ekexium Jan 28, 2021
a19f38b
Merge branch 'master' into begin-external-consistency
ekexium Jan 28, 2021
0929cce
make tidy
ekexium Jan 28, 2021
4a31085
resume tidb_guarantee_external_consistency variable
ekexium Jan 28, 2021
96c52f4
sysvar: enable tidb_guarantee_external_consistency by default
ekexium Feb 3, 2021
4c92eac
hide async-commit related sysvars
ekexium Feb 3, 2021
b639100
new syntax overrides sysvar
ekexium Feb 3, 2021
7ede31c
update parser dependency
ekexium Feb 3, 2021
044d27a
replace the ambiguous name 'external consistency'
ekexium Feb 3, 2021
de28dd7
update comment
ekexium Feb 3, 2021
cc648a4
fix: normal 'start transaction' won't override sysvar
ekexium Feb 3, 2021
e22085b
simplify code
ekexium Feb 4, 2021
20cf29f
session: add a GetOption method for Transaction
ekexium Feb 4, 2021
cdd3d51
resume parser dependency
ekexium Feb 4, 2021
bef4293
Merge branch 'master' into begin-external-consistency
ekexium Feb 4, 2021
7a79e17
Merge branch 'master' into begin-external-consistency
ekexium Feb 4, 2021
c7716a6
Merge remote-tracking branch 'origin/master' into begin-external-cons…
ekexium Feb 4, 2021
d75099a
Merge branch 'master' into begin-external-consistency
ti-srebot Feb 4, 2021
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4 changes: 4 additions & 0 deletions executor/simple.go
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Original file line number Diff line number Diff line change
Expand Up @@ -561,6 +561,7 @@ func (e *SimpleExec) executeBegin(ctx context.Context, s *ast.BeginStmt) error {
if s.ReadOnly && s.Bound != nil {
return e.executeStartTransactionReadOnlyWithTimestampBound(ctx, s)
}

// If BEGIN is the first statement in TxnCtx, we can reuse the existing transaction, without the
// need to call NewTxn, which commits the existing transaction and begins a new one.
// If the last un-committed/un-rollback transaction is a time-bounded read-only transaction, we should
Expand Down Expand Up @@ -591,6 +592,9 @@ func (e *SimpleExec) executeBegin(ctx context.Context, s *ast.BeginStmt) error {
if e.ctx.GetSessionVars().TxnCtx.IsPessimistic {
txn.SetOption(kv.Pessimistic, true)
}
if s.CausalConsistencyOnly {
txn.SetOption(kv.GuaranteeLinearizability, false)
}
return nil
}

Expand Down
12 changes: 6 additions & 6 deletions go.mod
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Original file line number Diff line number Diff line change
Expand Up @@ -46,7 +46,7 @@ require (
github.com/pingcap/goleveldb v0.0.0-20191226122134-f82aafb29989
github.com/pingcap/kvproto v0.0.0-20210125053538-4fb47d0584f2
github.com/pingcap/log v0.0.0-20201112100606-8f1e84a3abc8
github.com/pingcap/parser v0.0.0-20210125075924-ffe0fda947cb
github.com/pingcap/parser v0.0.0-20210203141130-32ef3e0e2e13
github.com/pingcap/sysutil v0.0.0-20201130064824-f0c8aa6a6966
github.com/pingcap/tidb-tools v4.0.9-0.20201127090955-2707c97b3853+incompatible
github.com/pingcap/tipb v0.0.0-20201229060814-148bc717ce4c
Expand All @@ -70,16 +70,16 @@ require (
go.uber.org/multierr v1.6.0 // indirect
go.uber.org/zap v1.16.0
golang.org/x/crypto v0.0.0-20200820211705-5c72a883971a // indirect
golang.org/x/net v0.0.0-20200904194848-62affa334b73
golang.org/x/net v0.0.0-20201021035429-f5854403a974
golang.org/x/sync v0.0.0-20201020160332-67f06af15bc9
golang.org/x/sys v0.0.0-20200819171115-d785dc25833f
golang.org/x/text v0.3.4
golang.org/x/tools v0.0.0-20200820010801-b793a1359eac
golang.org/x/sys v0.0.0-20210119212857-b64e53b001e4
golang.org/x/text v0.3.5
golang.org/x/tools v0.1.0
google.golang.org/grpc v1.27.1
gopkg.in/check.v1 v1.0.0-20200902074654-038fdea0a05b // indirect
gopkg.in/natefinch/lumberjack.v2 v2.0.0
gopkg.in/yaml.v2 v2.3.0 // indirect
honnef.co/go/tools v0.1.0 // indirect
honnef.co/go/tools v0.1.1 // indirect
sourcegraph.com/sourcegraph/appdash v0.0.0-20190731080439-ebfcffb1b5c0
sourcegraph.com/sourcegraph/appdash-data v0.0.0-20151005221446-73f23eafcf67
)
Expand Down
32 changes: 16 additions & 16 deletions go.sum
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Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -654,8 +654,8 @@ github.com/pingcap/log v0.0.0-20201112100606-8f1e84a3abc8 h1:M+DNpOu/I3uDmwee6vc
github.com/pingcap/log v0.0.0-20201112100606-8f1e84a3abc8/go.mod h1:4rbK1p9ILyIfb6hU7OG2CiWSqMXnp3JMbiaVJ6mvoY8=
github.com/pingcap/parser v0.0.0-20190506092653-e336082eb825/go.mod h1:1FNvfp9+J0wvc4kl8eGNh7Rqrxveg15jJoWo/a0uHwA=
github.com/pingcap/parser v0.0.0-20200422082501-7329d80eaf2c/go.mod h1:9v0Edh8IbgjGYW2ArJr19E+bvL8zKahsFp+ixWeId+4=
github.com/pingcap/parser v0.0.0-20210125075924-ffe0fda947cb h1:16lZkJzsAOIY781DmUgSU0El+GpV8fl3BohzVmHO1rE=
github.com/pingcap/parser v0.0.0-20210125075924-ffe0fda947cb/go.mod h1:GbEr2PgY72/4XqPZzmzstlOU/+il/wrjeTNFs6ihsSE=
github.com/pingcap/parser v0.0.0-20210203141130-32ef3e0e2e13 h1:hIbRR2siRrJniSRrMU+XgZl3reOWiPZk0P+7PwKXuEQ=
github.com/pingcap/parser v0.0.0-20210203141130-32ef3e0e2e13/go.mod h1:GbEr2PgY72/4XqPZzmzstlOU/+il/wrjeTNFs6ihsSE=
github.com/pingcap/pd v2.1.5+incompatible/go.mod h1:nD3+EoYes4+aNNODO99ES59V83MZSI+dFbhyr667a0E=
github.com/pingcap/pd/v4 v4.0.0-rc.1.0.20200422143320-428acd53eba2/go.mod h1:s+utZtXDznOiL24VK0qGmtoHjjXNsscJx3m1n8cC56s=
github.com/pingcap/sysutil v0.0.0-20200206130906-2bfa6dc40bcd/go.mod h1:EB/852NMQ+aRKioCpToQ94Wl7fktV+FNnxf3CX/TTXI=
Expand Down Expand Up @@ -890,7 +890,7 @@ github.com/xordataexchange/crypt v0.0.3-0.20170626215501-b2862e3d0a77/go.mod h1:
github.com/yookoala/realpath v1.0.0/go.mod h1:gJJMA9wuX7AcqLy1+ffPatSCySA1FQ2S8Ya9AIoYBpE=
github.com/yuin/goldmark v1.1.25/go.mod h1:3hX8gzYuyVAZsxl0MRgGTJEmQBFcNTphYh9decYSb74=
github.com/yuin/goldmark v1.1.27/go.mod h1:3hX8gzYuyVAZsxl0MRgGTJEmQBFcNTphYh9decYSb74=
github.com/yuin/goldmark v1.1.32/go.mod h1:3hX8gzYuyVAZsxl0MRgGTJEmQBFcNTphYh9decYSb74=
github.com/yuin/goldmark v1.2.1/go.mod h1:3hX8gzYuyVAZsxl0MRgGTJEmQBFcNTphYh9decYSb74=
github.com/yuin/gopher-lua v0.0.0-20181031023651-12c4817b42c5/go.mod h1:aEV29XrmTYFr3CiRxZeGHpkvbwq+prZduBqMaascyCU=
github.com/zaf/temp v0.0.0-20170209143821-94e385923345/go.mod h1:sXsZgXwh6DB0qlskmZVB4HE93e5YrktMrgUDPy9iYmY=
github.com/zhangjinpeng1987/raft v0.0.0-20200819064223-df31bb68a018 h1:T3OrqVdcH6z6SakR7WkECvGpdkfB0MAur/6zf66GPxQ=
Expand Down Expand Up @@ -1020,9 +1020,8 @@ golang.org/x/net v0.0.0-20200301022130-244492dfa37a/go.mod h1:z5CRVTTTmAJ677TzLL
golang.org/x/net v0.0.0-20200324143707-d3edc9973b7e/go.mod h1:qpuaurCH72eLCgpAm/N6yyVIVM9cpaDIP3A8BGJEC5A=
golang.org/x/net v0.0.0-20200421231249-e086a090c8fd/go.mod h1:qpuaurCH72eLCgpAm/N6yyVIVM9cpaDIP3A8BGJEC5A=
golang.org/x/net v0.0.0-20200520182314-0ba52f642ac2/go.mod h1:qpuaurCH72eLCgpAm/N6yyVIVM9cpaDIP3A8BGJEC5A=
golang.org/x/net v0.0.0-20200625001655-4c5254603344/go.mod h1:/O7V0waA8r7cgGh81Ro3o1hOxt32SMVPicZroKQ2sZA=
golang.org/x/net v0.0.0-20200904194848-62affa334b73 h1:MXfv8rhZWmFeqX3GNZRsd6vOLoaCHjYEX3qkRo3YBUA=
golang.org/x/net v0.0.0-20200904194848-62affa334b73/go.mod h1:/O7V0waA8r7cgGh81Ro3o1hOxt32SMVPicZroKQ2sZA=
golang.org/x/net v0.0.0-20201021035429-f5854403a974 h1:IX6qOQeG5uLjB/hjjwjedwfjND0hgjPMMyO1RoIXQNI=
golang.org/x/net v0.0.0-20201021035429-f5854403a974/go.mod h1:sp8m0HH+o8qH0wwXwYZr8TS3Oi6o0r6Gce1SSxlDquU=
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=
golang.org/x/oauth2 v0.0.0-20190604053449-0f29369cfe45/go.mod h1:gOpvHmFTYa4IltrdGE7lF6nIHvwfUNPOp7c8zoXwtLw=
Expand All @@ -1035,7 +1034,6 @@ golang.org/x/sync v0.0.0-20181221193216-37e7f081c4d4/go.mod h1:RxMgew5VJxzue5/jJ
golang.org/x/sync v0.0.0-20190227155943-e225da77a7e6/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
golang.org/x/sync v0.0.0-20190423024810-112230192c58/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
golang.org/x/sync v0.0.0-20190911185100-cd5d95a43a6e/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
golang.org/x/sync v0.0.0-20200625203802-6e8e738ad208/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
golang.org/x/sync v0.0.0-20201020160332-67f06af15bc9 h1:SQFwaSi55rU7vdNs9Yr0Z324VNlrF+0wMqRXT4St8ck=
golang.org/x/sync v0.0.0-20201020160332-67f06af15bc9/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
golang.org/x/sys v0.0.0-20180830151530-49385e6e1522/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
Expand Down Expand Up @@ -1080,14 +1078,15 @@ golang.org/x/sys v0.0.0-20200223170610-d5e6a3e2c0ae/go.mod h1:h1NjWce9XRLGQEsW7w
golang.org/x/sys v0.0.0-20200323222414-85ca7c5b95cd/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
golang.org/x/sys v0.0.0-20200413165638-669c56c373c4/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
golang.org/x/sys v0.0.0-20200420163511-1957bb5e6d1f/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
golang.org/x/sys v0.0.0-20200819171115-d785dc25833f h1:KJuwZVtZBVzDmEDtB2zro9CXkD9O0dpCv4o2LHbQIAw=
golang.org/x/sys v0.0.0-20200819171115-d785dc25833f/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
golang.org/x/sys v0.0.0-20200930185726-fdedc70b468f/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
golang.org/x/sys v0.0.0-20210119212857-b64e53b001e4 h1:myAQVi0cGEoqQVR5POX+8RR2mrocKqNN1hmeMqhX27k=
golang.org/x/sys v0.0.0-20210119212857-b64e53b001e4/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
golang.org/x/text v0.3.1-0.20180807135948-17ff2d5776d2/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
golang.org/x/text v0.3.2/go.mod h1:bEr9sfX3Q8Zfm5fL9x+3itogRgK3+ptLWKqgva+5dAk=
golang.org/x/text v0.3.3/go.mod h1:5Zoc/QRtKVWzQhOtBMvqHzDpF6irO9z98xDceosuGiQ=
golang.org/x/text v0.3.4 h1:0YWbFKbhXG/wIiuHDSKpS0Iy7FSA+u45VtBMfQcFTTc=
golang.org/x/text v0.3.4/go.mod h1:5Zoc/QRtKVWzQhOtBMvqHzDpF6irO9z98xDceosuGiQ=
golang.org/x/text v0.3.5 h1:i6eZZ+zk0SOf0xgBpEpPD18qWcJda6q1sxt3S0kzyUQ=
golang.org/x/text v0.3.5/go.mod h1:5Zoc/QRtKVWzQhOtBMvqHzDpF6irO9z98xDceosuGiQ=
golang.org/x/time v0.0.0-20180412165947-fbb02b2291d2/go.mod h1:tRJNPiyCQ0inRvYxbN9jk5I+vvW/OXSQhTDSoE431IQ=
golang.org/x/time v0.0.0-20181108054448-85acf8d2951c/go.mod h1:tRJNPiyCQ0inRvYxbN9jk5I+vvW/OXSQhTDSoE431IQ=
golang.org/x/time v0.0.0-20190308202827-9d24e82272b4/go.mod h1:tRJNPiyCQ0inRvYxbN9jk5I+vvW/OXSQhTDSoE431IQ=
Expand Down Expand Up @@ -1138,13 +1137,14 @@ golang.org/x/tools v0.0.0-20200325010219-a49f79bcc224/go.mod h1:Sl4aGygMT6LrqrWc
golang.org/x/tools v0.0.0-20200325203130-f53864d0dba1/go.mod h1:Sl4aGygMT6LrqrWclx+PTx3U+LnKx/seiNR+3G19Ar8=
golang.org/x/tools v0.0.0-20200422205258-72e4a01eba43/go.mod h1:EkVYQZoAsY45+roYkvgYkIh4xh/qjgUK9TdY2XT94GE=
golang.org/x/tools v0.0.0-20200527183253-8e7acdbce89d/go.mod h1:EkVYQZoAsY45+roYkvgYkIh4xh/qjgUK9TdY2XT94GE=
golang.org/x/tools v0.0.0-20200609164405-eb789aa7ce50/go.mod h1:EkVYQZoAsY45+roYkvgYkIh4xh/qjgUK9TdY2XT94GE=
golang.org/x/tools v0.0.0-20200820010801-b793a1359eac h1:DugppSxw0LSF8lcjaODPJZoDzq0ElTGskTst3ZaBkHI=
golang.org/x/tools v0.0.0-20200820010801-b793a1359eac/go.mod h1:njjCfa9FT2d7l9Bc6FUM5FLjQPp3cFF28FI3qnDFljA=
golang.org/x/tools v0.1.0 h1:po9/4sTYwZU9lPhi1tOrb4hCv3qrhiQ77LZfGa2OjwY=
golang.org/x/tools v0.1.0/go.mod h1:xkSsbof2nBLbhDlRMhhhyNLN/zl3eTqcnHD5viDpcZ0=
golang.org/x/xerrors v0.0.0-20190717185122-a985d3407aa7/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
golang.org/x/xerrors v0.0.0-20191011141410-1b5146add898/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
golang.org/x/xerrors v0.0.0-20191204190536-9bdfabe68543 h1:E7g+9GITq07hpfrRu66IVDexMakfv52eLZ2CXBWiKr4=
golang.org/x/xerrors v0.0.0-20191204190536-9bdfabe68543/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
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=
gonum.org/v1/gonum v0.0.0-20180816165407-929014505bf4/go.mod h1:Y+Yx5eoAFn32cQvJDxZx5Dpnq+c3wtXuadVZAcxbbBo=
gonum.org/v1/gonum v0.0.0-20181121035319-3f7ecaa7e8ca/go.mod h1:Y+Yx5eoAFn32cQvJDxZx5Dpnq+c3wtXuadVZAcxbbBo=
gonum.org/v1/gonum v0.6.0/go.mod h1:9mxDZsDKxgMAuccQkewq682L+0eCu4dCN2yonUJTCLU=
Expand Down Expand Up @@ -1256,8 +1256,8 @@ honnef.co/go/tools v0.0.0-20190523083050-ea95bdfd59fc/go.mod h1:rf3lG4BRIbNafJWh
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/go.mod h1:X/FiERA/W4tHapMX5mGpAtMSVEeEUOyHaw9vFzvIQ3k=
honnef.co/go/tools v0.1.0 h1:AWNL1W1i7f0wNZ8VwOKNJ0sliKvOF/adn0EHenfUh+c=
honnef.co/go/tools v0.1.0/go.mod h1:XtegFAyX/PfluP4921rXU5IkjkqBCDnUq4W8VCIoKvM=
honnef.co/go/tools v0.1.1 h1:EVDuO03OCZwpV2t/tLLxPmPiomagMoBOgfPt0FM+4IY=
honnef.co/go/tools v0.1.1/go.mod h1:NgwopIslSNH47DimFoV78dnkksY2EFtX0ajyb3K/las=
k8s.io/klog v1.0.0/go.mod h1:4Bi6QPql/J/LkTDqv7R/cd3hPo4k2DG6Ptcz060Ez5I=
modernc.org/b v1.0.0/go.mod h1:uZWcZfRj1BpYzfN9JTerzlNUnnPsV9O2ZA8JsRcubNg=
modernc.org/db v1.0.0/go.mod h1:kYD/cO29L/29RM0hXYl4i3+Q5VojL31kTUVpVJDw0s8=
Expand Down
6 changes: 4 additions & 2 deletions kv/kv.go
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Original file line number Diff line number Diff line change
Expand Up @@ -63,8 +63,8 @@ const (
EnableAsyncCommit
// Enable1PC indicates whether one-phase commit is enabled
Enable1PC
// GuaranteeExternalConsistency indicates whether to guarantee external consistency at the cost of an extra tso request before prewrite
GuaranteeExternalConsistency
// GuaranteeLinearizability indicates whether to guarantee linearizability at the cost of an extra tso request before prewrite
GuaranteeLinearizability
// TxnScope indicates which @@txn_scope this transaction will work with.
TxnScope
// StalenessReadOnly indicates whether the transaction is staleness read only transaction
Expand Down Expand Up @@ -266,6 +266,8 @@ type Transaction interface {
// SetOption sets an option with a value, when val is nil, uses the default
// value of this option.
SetOption(opt Option, val interface{})
// GetOption returns the option
GetOption(opt Option) interface{}
// DelOption deletes an option.
DelOption(opt Option)
// IsReadOnly checks if the transaction has only performed read operations.
Expand Down
7 changes: 5 additions & 2 deletions session/session.go
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Original file line number Diff line number Diff line change
Expand Up @@ -500,7 +500,10 @@ func (s *session) doCommit(ctx context.Context) error {
}
s.txn.SetOption(kv.EnableAsyncCommit, s.GetSessionVars().EnableAsyncCommit)
s.txn.SetOption(kv.Enable1PC, s.GetSessionVars().Enable1PC)
s.txn.SetOption(kv.GuaranteeExternalConsistency, s.GetSessionVars().GuaranteeExternalConsistency)
// priority of the sysvar is lower than `start transaction with causal consistency only`
if s.txn.GetOption(kv.GuaranteeLinearizability) == nil {
s.txn.SetOption(kv.GuaranteeLinearizability, s.GetSessionVars().GuaranteeLinearizability)
}

return s.txn.Commit(tikvutil.SetSessionID(ctx, s.GetSessionVars().ConnectionID))
}
Expand Down Expand Up @@ -2631,7 +2634,7 @@ var builtinGlobalVariable = []string{
variable.TiDBEnableRateLimitAction,
variable.TiDBEnableAsyncCommit,
variable.TiDBEnable1PC,
variable.TiDBGuaranteeExternalConsistency,
variable.TiDBGuaranteeLinearizability,
variable.TiDBAnalyzeVersion,
variable.TiDBEnableIndexMergeJoin,
variable.TiDBTrackAggregateMemoryUsage,
Expand Down
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