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ddl: don't delay for async commit if MDL is enabled#39446

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ti-chi-bot merged 9 commits intopingcap:masterfrom
wjhuang2016:test_delay
Nov 30, 2022
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ddl: don't delay for async commit if MDL is enabled#39446
ti-chi-bot merged 9 commits intopingcap:masterfrom
wjhuang2016:test_delay

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@wjhuang2016 wjhuang2016 commented Nov 29, 2022 •
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Signed-off-by: wjhuang2016 huangwenjun1997@gmail.com

What problem does this PR solve?

Issue Number: ref #39196

Problem Summary:

No need to delay for async commit if MDL is enabled.

Check List

Tests

  • Unit test
  • Integration test
  • Manual test (add detailed scripts or steps below)
  • No code

Side effects

  • Performance regression: Consumes more CPU
  • Performance regression: Consumes more Memory
  • Breaking backward compatibility

Documentation

  • Affects user behaviors
  • Contains syntax changes
  • Contains variable changes
  • Contains experimental features
  • Changes MySQL compatibility

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Please refer to Release Notes Language Style Guide to write a quality release note.

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Signed-off-by: wjhuang2016 <huangwenjun1997@gmail.com>
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ti-chi-bot commented Nov 29, 2022 •
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[REVIEW NOTIFICATION]

This pull request has been approved by:

  • hawkingrei
  • sticnarf
  • tangenta

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@ti-chi-bot ti-chi-bot added do-not-merge/invalid-title release-note-none Denotes a PR that doesn't merit a release note. size/XS Denotes a PR that changes 0-9 lines, ignoring generated files. labels Nov 29, 2022
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wjhuang2016 commented Nov 30, 2022

/run-unit-test

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Signed-off-by: wjhuang2016 <huangwenjun1997@gmail.com>
@wjhuang2016 wjhuang2016 changed the title test ddl: don't delay for async commit if MDL is enabled Nov 30, 2022
@ti-chi-bot ti-chi-bot added the status/LGT1 Indicates that a PR has LGTM 1. label Nov 30, 2022
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Signed-off-by: wjhuang2016 <huangwenjun1997@gmail.com>
@ti-chi-bot ti-chi-bot added status/LGT2 Indicates that a PR has LGTM 2. and removed status/LGT1 Indicates that a PR has LGTM 1. labels Nov 30, 2022
@cfzjywxk cfzjywxk requested a review from sticnarf November 30, 2022 07:58
@cfzjywxk cfzjywxk added require-LGT3 Indicates that the PR requires three LGTM. sig/transaction SIG:Transaction labels Nov 30, 2022
sticnarf
sticnarf reviewed Nov 30, 2022
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ddl/ddl.go
// It should be called before any DDL that could break data consistency.
// This provides a safe window for async commit and 1PC to commit with an old schema.
func delayForAsyncCommit() {
if variable.EnableMDL.Load() {
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Is it possible to switch off MDL during an ongoing DDL and break some constraints?

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@wjhuang2016 wjhuang2016 Nov 30, 2022 •
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No, we forbid switching MDL if there is any DDL running

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sticnarf approved these changes Nov 30, 2022
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I cannot think of possible cases of inconsistency after MDL is enabled now. I hope our tests will be still happy in the following days.

@ti-chi-bot ti-chi-bot added status/LGT3 The PR has already had 3 LGTM. and removed status/LGT2 Indicates that a PR has LGTM 2. labels Nov 30, 2022
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wjhuang2016 commented Nov 30, 2022

/merge

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ti-chi-bot commented Nov 30, 2022

This pull request has been accepted and is ready to merge.

DetailsCommit hash: d37f633

@ti-chi-bot ti-chi-bot added the status/can-merge Indicates a PR has been approved by a committer. label Nov 30, 2022
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wjhuang2016 commented Nov 30, 2022

/run-check_dev

@ti-chi-bot ti-chi-bot merged commit d20d71f into pingcap:master Nov 30, 2022
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sre-bot commented Nov 30, 2022

TiDB MergeCI notify

CI Name Result Duration Compare with Parent commit
idc-jenkins-ci/integration-cdc-test 🟢 all 40 tests passed 26 min Existing passed
idc-jenkins-ci-tidb/integration-common-test 🟢 all 17 tests passed 21 min Existing passed
idc-jenkins-ci-tidb/common-test 🟢 all 11 tests passed 11 min Existing passed
idc-jenkins-ci-tidb/integration-ddl-test 🟢 all 6 tests passed 6 min 4 sec Existing passed
idc-jenkins-ci-tidb/sqllogic-test-2 🟢 all 28 tests passed 5 min 54 sec Existing passed
idc-jenkins-ci-tidb/tics-test 🟢 all 1 tests passed 5 min 45 sec Existing passed
idc-jenkins-ci-tidb/sqllogic-test-1 🟢 all 26 tests passed 4 min 53 sec Existing passed
idc-jenkins-ci-tidb/mybatis-test 🟢 all 1 tests passed 3 min 44 sec Existing passed
idc-jenkins-ci-tidb/integration-compatibility-test 🟢 all 1 tests passed 3 min 25 sec Existing passed
idc-jenkins-ci-tidb/plugin-test 🟢 build success, plugin test success 4min Existing passed

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@hawkingrei hawkingrei hawkingrei approved these changes

@sticnarf sticnarf sticnarf approved these changes

@tangenta tangenta tangenta approved these changes

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