ddl: dynamically adjusting the concurrency and batch size of reorganization job (#57468)

[ti-chi-bot]

This is an automated cherry-pick of #57468

What problem does this PR solve?

Issue Number: ref #57229 #57526

Problem Summary:

What changed and how does it work?

Dynamically adjust the worker count and batch size for the reorganization DDL job. A background goroutine checks and updates the worker count every 2 seconds. The batch size is evaluated and adjusted as needed before processing each chunk of data.

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

[fzzf678]

/cherry-pick-invite

[ti-chi-bot]

@fzzf678 you're already a collaborator in repo ti-chi-bot/tidb

[codecov]

Codecov Report

Attention: Patch coverage is 72.99270% with 37 lines in your changes missing coverage. Please review.

Please upload report for BASE (release-8.5@99a2df5). Learn more about missing BASE report.

Additional details and impacted files

@@               Coverage Diff                @@
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Flag	Coverage Δ
integration	36.8179% <66.4233%> (?)
unit	72.4847% <62.0438%> (?)

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

Components	Coverage Δ
dumpling	52.9478% <0.0000%> (?)
parser	∅ <0.0000%> (?)
br	52.2746% <0.0000%> (?)

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[fzzf678]

/retest

[fzzf678]

/lgtm

[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2024-11-21 14:43:35.018633094 +0000 UTC m=+129202.638287613: ☑️ agreed by CbcWestwolf.
• 2024-11-21 15:03:16.852346204 +0000 UTC m=+130384.472000716: ☑️ agreed by fzzf678.

[fzzf678]

/approve_pr

[fzzf678]

/approve

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: CbcWestwolf, fzzf678, tangenta

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Needs approval from an approver in each of these files:

• OWNERS [CbcWestwolf,tangenta]
• pkg/ddl/OWNERS [tangenta]
• pkg/disttask/OWNERS [tangenta]
• pkg/meta/OWNERS [tangenta]

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