Lightning: Skip apply ioworkers when seek(0, io.SeekCurrent) (#57454)

[ti-chi-bot]

This is an automated cherry-pick of #57454

What problem does this PR solve?

Issue Number: close #57413

Problem Summary:
When importing from cloud storage, high concurrency can lead to bottlenecks in mydump.PooledReader.Seek(0, io.SeekCurrent) due to the application of ioWorkers. Seek(0, io.SeekCurrent) does not cause disk IO operations, applying ioWorkers is unnecessary.

What changed and how does it work?

Skip apply ioworkers when seek(0, io.SeekCurrent)

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

[lance6716]

/retest

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Please upload report for BASE (release-7.5@bf0766b). Learn more about missing BASE report.

Additional details and impacted files

@@               Coverage Diff                @@
##             release-7.5     #57930   +/-   ##
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  Coverage               ?   72.1526%           
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  Files                  ?       1415           
  Lines                  ?     412825           
  Branches               ?          0           
================================================
  Hits                   ?     297864           
  Misses                 ?      94984           
  Partials               ?      19977           

Flag	Coverage Δ
unit	72.1526% <100.0000%> (?)

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

Components	Coverage Δ
dumpling	52.9400% <0.0000%> (?)
parser	∅ <0.0000%> (?)
br	53.4969% <0.0000%> (?)

[ti-chi-bot]

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[Benjamin2037]

LGTM

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: Benjamin2037, lance6716, xuanyu66

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• br/pkg/lightning/OWNERS [Benjamin2037,lance6716]

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2024-12-03 09:00:03.156943145 +0000 UTC m=+1145390.776597660: ☑️ agreed by lance6716.
• 2024-12-04 06:06:18.139733754 +0000 UTC m=+1221365.759388269: ☑️ agreed by Benjamin2037.