br: lock the call of update stats meta

[Leavrth]

What problem does this PR solve?

Issue Number: ref #47596

Problem Summary:
the tidb session is not thread safe

What is changed and how it works?

add lock

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

Merging #47610 (0399cc2) into master (f4b287d) will increase coverage by 3.9492%.
Report is 21 commits behind head on master.
The diff coverage is 90.0000%.

Additional details and impacted files

@@               Coverage Diff                @@
##             master     #47610        +/-   ##
================================================
+ Coverage   71.8877%   75.8369%   +3.9492%     
================================================
  Files          1353       2555      +1202     
  Lines        401082     758345    +357263     
================================================
+ Hits         288329     575106    +286777     
- Misses        93295     146756     +53461     
- Partials      19458      36483     +17025     

Flag	Coverage Δ
integration	46.5713% <90.0000%> (?)
unit	73.2934% <30.0000%> (+1.4056%)	⬆️

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

Components	Coverage Δ
dumpling	53.9913% <ø> (ø)
parser	84.7222% <ø> (-0.0106%)	⬇️
br	65.1061% <90.0000%> (+11.7570%)	⬆️

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

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

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Needs approval from an approver in each of these files:

• br/OWNERS [3pointer,YuJuncen]

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2023-10-16 03:02:09.449014082 +0000 UTC m=+1626127.036124212: ☑️ agreed by YuJuncen.
• 2023-10-16 03:02:17.889521368 +0000 UTC m=+1626135.476631508: ☑️ agreed by 3pointer.

[Leavrth]

/hold

[Leavrth]

/test pull-integration-test

[ti-chi-bot]

@Leavrth: The specified target(s) for /test were not found.
The following commands are available to trigger required jobs:

• /test build
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• /test check-dev2
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• /test pull-br-integration-test
• /test pull-common-test
• /test pull-e2e-test
• /test pull-integration-common-test
• /test pull-integration-copr-test
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Use /test all to run the following jobs that were automatically triggered:

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In response to this:

/test pull-integration-test

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[Leavrth]

/test pull-br-integration-test

[tiprow]

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

In response to this:

/test pull-integration-test

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[Leavrth]

/hold

[tiprow]

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

In response to this:

/test pull-br-integration-test

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[Leavrth]

/retest

[tiprow]

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

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/retest

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[Leavrth]

/ok-to-test