br: cancel context when timer stop

[Leavrth]

What problem does this PR solve?

Issue Number: ref #53480

Problem Summary:
the context will leak because it is not cancelled.

What changed and how does it work?

cancel the context

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

[tiprow]

Hi @Leavrth. 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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[3pointer]

/hold for adding test

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 57.3126%. Comparing base (3c8f2f3) to head (e1402b2).
Report is 40 commits behind head on master.

Additional details and impacted files

@@                Coverage Diff                @@
##             master     #56948         +/-   ##
=================================================
- Coverage   73.3393%   57.3126%   -16.0268%     
=================================================
  Files          1636       1776        +140     
  Lines        453658     638857     +185199     
=================================================
+ Hits         332710     366146      +33436     
- Misses       100561     248125     +147564     
- Partials      20387      24586       +4199     

Flag	Coverage Δ
integration	38.5954% <100.0000%> (?)
unit	72.8647% <100.0000%> (+0.3130%)	⬆️

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

Components	Coverage Δ
dumpling	52.9478% <ø> (ø)
parser	∅ <ø> (∅)
br	63.2931% <100.0000%> (+17.3164%)	⬆️

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: 3pointer, YuJuncen

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Needs approval from an approver in each of these files:

• br/OWNERS [3pointer,YuJuncen]

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2024-10-30 06:28:00.160674458 +0000 UTC m=+417592.999829989: ☑️ agreed by YuJuncen.
• 2024-10-30 06:31:02.657305995 +0000 UTC m=+417775.496461542: ☑️ agreed by 3pointer.

[Leavrth]

/ok-to-test

[Leavrth]

/retest

[Leavrth]

/test pull-br-integration-test

[tiprow]

@Leavrth: The specified target(s) for /test were not found.
The following commands are available to trigger required jobs:

• /test fast_test_tiprow
• /test fast_test_tiprow_ddlargsv1
• /test tidb_parser_test

Use /test all to run the following jobs that were automatically triggered:

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In response to this:

/test pull-br-integration-test

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[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-8.1: #57005.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-8.4: #57006.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-6.5: #57007.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-7.1: #57008.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-7.5: #57009.