copIterator: return context error to avoid return incorrect result on context cancel/timeout

[D3Hunter]

What problem does this PR solve?

Issue Number: close #50089 #55500

Problem Summary:

What changed and how does it work?

always return context error when recvFromRespCh return closed=true

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 @D3Hunter. Thanks for your PR.

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 74.7152%. Comparing base (0afe54d) to head (4d53911).
Report is 727 commits behind head on master.

Additional details and impacted files

@@               Coverage Diff                @@
##             master     #53489        +/-   ##
================================================
+ Coverage   72.5326%   74.7152%   +2.1826%     
================================================
  Files          1505       1505                
  Lines        429866     430465       +599     
================================================
+ Hits         311793     321623      +9830     
+ Misses        98774      89007      -9767     
- Partials      19299      19835       +536     

Flag	Coverage Δ
integration	49.4006% <54.5454%> (?)
unit	71.4579% <72.7272%> (+0.0379%)	⬆️

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

Components	Coverage Δ
dumpling	53.9957% <ø> (ø)
parser	∅ <ø> (∅)
br	50.4164% <ø> (+9.0429%)	⬆️

[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2024-05-23 03:27:48.375031511 +0000 UTC m=+2315022.132167085: ☑️ agreed by tiancaiamao.
• 2024-05-23 06:09:31.732759772 +0000 UTC m=+2324725.489895333: ☑️ agreed by wshwsh12.

[tiprow]

@D3Hunter: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
fast_test_tiprow	4d53911	link	true	/test fast_test_tiprow

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[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: tangenta, tiancaiamao, wshwsh12

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Needs approval from an approver in each of these files:

• OWNERS [tangenta,tiancaiamao,wshwsh12]
• pkg/ddl/OWNERS [tangenta]
• pkg/disttask/OWNERS [tangenta]

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[D3Hunter]

/retest

[tiprow]

@D3Hunter: Cannot trigger testing until a trusted user reviews the PR and leaves an /ok-to-test message.

In response to this:

/retest

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-sigs/prow repository.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-8.1: #55499.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-6.5: #55636.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-7.1: #55637.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-7.5: #55638.