br: optimize memory allocation in waitUntilAllScheduleStopped

[arturmelanchyk]

What problem does this PR solve?

Issue Number: close #xxx

Problem Summary:

What changed and how does it work?

Check List

Tests

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

  • I checked and no code files have been changed.

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

[ti-chi-bot]

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[ti-chi-bot]

Hi @arturmelanchyk. Thanks for your PR.

I'm waiting for a pingcap member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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[tiprow]

Hi @arturmelanchyk. Thanks for your PR.

PRs from untrusted users cannot be marked as trusted with /ok-to-test in this repo meaning untrusted PR authors can never trigger tests themselves. Collaborators can still trigger tests on the PR using /test all.

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[hawkingrei]

/ok-to-test

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 2 lines in your changes missing coverage. Please review.

Project coverage is 74.6848%. Comparing base (8390fc4) to head (49cd4f6).

Additional details and impacted files

@@               Coverage Diff                @@
##             master     #58806        +/-   ##
================================================
+ Coverage   73.0978%   74.6848%   +1.5870%     
================================================
  Files          1676       1691        +15     
  Lines        463791     463892       +101     
================================================
+ Hits         339021     346457      +7436     
+ Misses       103929      95827      -8102     
- Partials      20841      21608       +767     

Flag	Coverage Δ
integration	46.0126% <0.0000%> (?)
unit	72.3073% <0.0000%> (+0.0234%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Components	Coverage Δ
dumpling	52.6910% <ø> (ø)
parser	∅ <ø> (∅)
br	61.5938% <0.0000%> (+15.8608%)	⬆️

[ti-chi-bot]

[FORMAT CHECKER NOTIFICATION]

Notice: To remove the do-not-merge/needs-linked-issue label, please provide the linked issue number on one line in the PR body, for example: Issue Number: close #123 or Issue Number: ref #456.

_{📖 For more info, you can check the "Contribute Code" section in the development guide.}

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Notice: To remove the do-not-merge/needs-tests-checked label, please finished the tests then check the finished items in description.

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Tests

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_{📖 For more info, you can check the "Contribute Code" section in the development guide.}

[arturmelanchyk]

Hi @hawkingrei
could you please look into this?