br: use a unique session for checkpoint runner

[Leavrth]

What problem does this PR solve?

Issue Number: close #56488 #56308 #56410 #56450

Problem Summary:
the session cannot be used concurrently.

What changed and how does it work?

use a unique session for checkpoint runner.

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 68.42105% with 6 lines in your changes missing coverage. Please review.

Project coverage is 76.0725%. Comparing base (df821b9) to head (dec1a0c).
Report is 1 commits behind head on master.

Additional details and impacted files

@@               Coverage Diff                @@
##             master     #56487        +/-   ##
================================================
+ Coverage   73.2357%   76.0725%   +2.8367%     
================================================
  Files          1626       1626                
  Lines        448692     448878       +186     
================================================
+ Hits         328603     341473     +12870     
+ Misses        99977      86417     -13560     
- Partials      20112      20988       +876     

Flag	Coverage Δ
integration	50.4153% <68.4210%> (?)
unit	72.4566% <31.5789%> (+0.0165%)	⬆️

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	63.0512% <68.4210%> (+17.5797%)	⬆️

[Leavrth]

/retest

[tiprow]

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

In response to this:

/retest

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[Tristan1900]

it might also solve this flaky test based on the issue it solves? #56450

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

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

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• br/OWNERS [3pointer,BornChanger]

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2024-10-09 02:33:57.054675799 +0000 UTC m=+1013392.474888796: ☑️ agreed by 3pointer.
• 2024-10-09 03:37:32.933914321 +0000 UTC m=+1017208.354127330: ☑️ agreed by BornChanger.