br: implement reading migration

[Leavrth]

What problem does this PR solve?

Issue Number: close #57210

Problem Summary:
implement reading migration

What changed and how does it work?

implement reading migration

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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[codecov]

Codecov Report

Attention: Patch coverage is 0% with 236 lines in your changes missing coverage. Please review.

Project coverage is 73.6012%. Comparing base (cec48bb) to head (6109d40).
Report is 4 commits behind head on master.

Additional details and impacted files

@@               Coverage Diff                @@
##             master     #57237        +/-   ##
================================================
+ Coverage   72.9242%   73.6012%   +0.6769%     
================================================
  Files          1659       1675        +16     
  Lines        458547     458809       +262     
================================================
+ Hits         334392     337689      +3297     
+ Misses       103613     100138      -3475     
- Partials      20542      20982       +440     

Flag	Coverage Δ
integration	28.9845% <0.0000%> (?)

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

Components	Coverage Δ
dumpling	52.7673% <ø> (ø)
parser	∅ <ø> (∅)
br	54.8563% <0.0000%> (+9.8019%)	⬆️

[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2024-11-08 09:36:23.538274458 +0000 UTC m=+3345.729143452: ☑️ agreed by YuJuncen.

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: YuJuncen

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Needs approval from an approver in each of these files:

• br/OWNERS [YuJuncen]

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[Leavrth]

/check-issue-triage-complete

[ti-chi-bot]

@Leavrth: 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/check_dev_2	6109d40	link	true	/test check-dev2
idc-jenkins-ci-tidb/unit-test	6109d40	link	true	/test unit-test
pull-br-integration-test	6109d40	link	true	/test pull-br-integration-test

Full PR test history. Your PR dashboard.

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/test-infra repository. I understand the commands that are listed here.