log backup: set a proper maxVersion to resolve lock

[3pointer]

What problem does this PR solve?

Issue Number: close #57134

Problem Summary:

1. See issue.

What changed and how does it work?

To minimize the risk of lock conflicts, set the maxVersion to be the largest existing version value across all slow regions, incremented by 1. This adjustment helps optimize RPO by proactively reducing lock contention.

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 @3pointer. Thanks for your PR.

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[codecov]

Codecov Report

Attention: Patch coverage is 87.50000% with 1 line in your changes missing coverage. Please review.

Project coverage is 74.0695%. Comparing base (87669fb) to head (a803fd4).

Additional details and impacted files

@@               Coverage Diff                @@
##             master     #57178        +/-   ##
================================================
+ Coverage   73.0633%   74.0695%   +1.0061%     
================================================
  Files          1659       1672        +13     
  Lines        458027     458014        -13     
================================================
+ Hits         334650     339249      +4599     
+ Misses       102843      97568      -5275     
- Partials      20534      21197       +663     

Flag	Coverage Δ
integration	39.7846% <0.0000%> (?)

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	60.9445% <87.5000%> (+15.2242%)	⬆️

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: YuJuncen

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2024-11-07 02:45:48.07396117 +0000 UTC m=+1095460.913116709: ☑️ agreed by YuJuncen.

[ti-chi-bot]

@3pointer: The following tests failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
idc-jenkins-ci-tidb/unit-test	a803fd4	link	true	/test unit-test
idc-jenkins-ci-tidb/build	a803fd4	link	true	/test build
idc-jenkins-ci-tidb/check_dev	a803fd4	link	true	/test check-dev
idc-jenkins-ci-tidb/check_dev_2	a803fd4	link	true	/test check-dev2
pull-br-integration-test	a803fd4	link	true	/test pull-br-integration-test

Full PR test history. Your PR dashboard.

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