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executor: disable probe short path in hash join #53079
executor: disable probe short path in hash join #53079
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Codecov ReportAll modified and coverable lines are covered by tests ✅
Additional details and impacted files@@ Coverage Diff @@
## master #53079 +/- ##
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+ Coverage 72.4348% 74.7272% +2.2923%
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Files 1492 1514 +22
Lines 428995 438504 +9509
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+ Hits 310742 327682 +16940
+ Misses 98991 90324 -8667
- Partials 19262 20498 +1236
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@XuHuaiyu: Your lgtm message is repeated, so it is ignored. In response to this: Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository. |
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LGTM
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/test check-dev2 |
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[APPROVALNOTIFIER] This PR is APPROVED This pull-request has been approved by: guo-shaoge, XuHuaiyu, yibin87 The full list of commands accepted by this bot can be found here. The pull request process is described here
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[LGTM Timeline notifier]Timeline:
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In response to a cherrypick label: new pull request created to branch |
Signed-off-by: ti-chi-bot <[email protected]>
Signed-off-by: ti-chi-bot <[email protected]>
What problem does this PR solve?
Issue Number: close #51998
Problem Summary:
In TiDB's hash join, there is a short path in probe side:
tidb/pkg/executor/join/join.go
Lines 275 to 277 in 65817ac
If the probe side is empty, and current join use inner side to build, then the join can mark to finished without waiting the build side. This short-path can cause random fail for the case that probe side is empty, but build side may meet error during execution. In this case, there is a data race between build side and probe side:
This will cause random fail
What changed and how does it work?
Check List
Tests
Side effects
Documentation
Release note
Please refer to Release Notes Language Style Guide to write a quality release note.