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executor,session: reimplement lock->put by SetLockedKeyValue #42642

Merged
merged 3 commits into from
Mar 28, 2023
Merged

executor,session: reimplement lock->put by SetLockedKeyValue #42642

merged 3 commits into from
Mar 28, 2023

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zyguan
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@zyguan zyguan commented Mar 28, 2023

What problem does this PR solve?

Issue Number: ref #28011

Problem Summary: as described in #28011 , kv pairs converted from locks is visible to union-scan, which leads to duplicated rows (one from snapshot and the other from mem-index-reader).

What is changed and how it works?

Instead of writing membuf directly, cache locked key-value pairs that might be converted to PUT separately, and merge them on commit.

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

Release note

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

None

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ti-chi-bot commented Mar 28, 2023 •
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[REVIEW NOTIFICATION]

This pull request has been approved by:

  • cfzjywxk
  • ekexium

To complete the pull request process, please ask the reviewers in the list to review by filling /cc @reviewer in the comment.
After your PR has acquired the required number of LGTMs, you can assign this pull request to the committer in the list by filling /assign @committer in the comment to help you merge this pull request.

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@ti-chi-bot ti-chi-bot added release-note-none Denotes a PR that doesn't merit a release note. size/M Denotes a PR that changes 30-99 lines, ignoring generated files. labels Mar 28, 2023
@zyguan zyguan requested review from cfzjywxk and ekexium March 28, 2023 08:49
ekexium
ekexium reviewed Mar 28, 2023
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The return value is never used?

@zyguan
fix check-dev
bea40d6 
Signed-off-by: zyguan <[email protected]>
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zyguan commented Mar 28, 2023

The return values is never used?

Do you mean the return of LazyTxn.ChangeLockIntoPut? Yes, it's unused by now.

cfzjywxk
cfzjywxk reviewed Mar 28, 2023
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tests/realtikvtest/pessimistictest/pessimistic_test.go
@@ -2913,6 +2913,40 @@ func TestChangeLockToPut(t *testing.T) {
tk.MustExec("admin check table t1")
}

func TestIssue28011(t *testing.T) {
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We don't have a test to cover the effect of changing, maybe it's needed to tested by hand.

@ti-chi-bot ti-chi-bot added the status/LGT1 Indicates that a PR has LGTM 1. label Mar 28, 2023
@ti-chi-bot ti-chi-bot removed the status/LGT1 Indicates that a PR has LGTM 1. label Mar 28, 2023
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ekexium commented Mar 28, 2023

/merge

@ti-chi-bot ti-chi-bot added the status/LGT2 Indicates that a PR has LGTM 2. label Mar 28, 2023
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This pull request has been accepted and is ready to merge.

Commit hash: e33891f

@ti-chi-bot ti-chi-bot added the status/can-merge Indicates a PR has been approved by a committer. label Mar 28, 2023
@ti-chi-bot ti-chi-bot merged commit 0c7e204 into pingcap:release-6.1-20230328-v6.1.1 Mar 28, 2023
zyguan added a commit to ti-chi-bot/tidb that referenced this pull request Mar 29, 2023
@zyguan
executor,session: reimplement lock->put by SetLockedKeyValue (pingc…
483ffd9 
…ap#42642)

ref pingcap#28011

Signed-off-by: zyguan <[email protected]>
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@cfzjywxk cfzjywxk cfzjywxk approved these changes

@ekexium ekexium ekexium approved these changes

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