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sink/mysql: adjust producer/consumer exit sequence to avoid goroutine leak (#1929) #1945

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This is an automated cherry-pick of #1929

What problem does this PR solve?

Fix a goroutine leak bug, where the sink worker has exited, but more txns are sent to txn channel of sink worker.
And the producer will wait for the txn to be consumed forever.

What is changed and how it works?

Add a cleanup mechanism for sink worker.

  1. producer(sink.flushRowChangedEvents goroutine) of txnCh exits
  2. goroutine in 1 sends notification to closedCh of each sink worker
  3. each sink worker receives the notification from closedCh and mark FinishWg as Done

Check List

Tests

  • Unit test
  • Integration test

Release note

  • Fix a bug that some MySQL connection could leak after MySQL sink meets error and pauses.

@ti-chi-bot ti-chi-bot added component/sink Sink component. size/L Denotes a PR that changes 100-499 lines, ignoring generated files. type/cherry-pick-for-release-4.0 This PR is cherry-picked to release-4.0 from a source PR. labels Jun 5, 2021
@ti-chi-bot ti-chi-bot requested a review from overvenus June 5, 2021 01:35
@ti-chi-bot ti-chi-bot requested a review from amyangfei June 5, 2021 01:35
@lonng lonng added this to the v4.0.14 milestone Jun 10, 2021
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[REVIEW NOTIFICATION]

This pull request has been approved by:

  • amyangfei

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 the status/LGT1 Indicates that a PR has LGTM 1. label Jun 24, 2021
@lonng lonng added cherry-pick-approved Cherry pick PR approved by release team. and removed do-not-merge/cherry-pick-not-approved labels Jul 6, 2021
@amyangfei amyangfei added the require-LGT1 Indicates that the PR requires an LGTM. label Jul 7, 2021
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/merge

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

Commit hash: 75495e6

@ti-chi-bot ti-chi-bot added the status/can-merge Indicates a PR has been approved by a committer. label Jul 7, 2021
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@ti-chi-bot: Your PR was out of date, I have automatically updated it for you.

At the same time I will also trigger all tests for you:

/run-all-tests

If the CI test fails, you just re-trigger the test that failed and the bot will merge the PR for you after the CI passes.

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 ti-community-infra/tichi repository.

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Codecov Report

Merging #1945 (5286277) into release-4.0 (753073a) will decrease coverage by 0.0143%.
The diff coverage is 62.2777%.

@@                 Coverage Diff                 @@
##           release-4.0      #1945        +/-   ##
===================================================
- Coverage      53.7661%   53.7518%   -0.0144%     
===================================================
  Files              153        163        +10     
  Lines            15958      17365      +1407     
===================================================
+ Hits              8580       9334       +754     
- Misses            6475       7046       +571     
- Partials           903        985        +82     

@ti-chi-bot ti-chi-bot merged commit 4289173 into pingcap:release-4.0 Jul 7, 2021
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cherry-pick-approved Cherry pick PR approved by release team. component/sink Sink component. require-LGT1 Indicates that the PR requires an LGTM. size/L Denotes a PR that changes 100-499 lines, ignoring generated files. status/can-merge Indicates a PR has been approved by a committer. status/LGT1 Indicates that a PR has LGTM 1. type/cherry-pick-for-release-4.0 This PR is cherry-picked to release-4.0 from a source PR.
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4 participants