ddl: dynamically adjusting the concurrency and batch size of reorganization job

[fzzf678]

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

[tiprow]

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[codecov]

Codecov Report

Attention: Patch coverage is 62.04380% with 52 lines in your changes missing coverage. Please review.

Project coverage is 74.8176%. Comparing base (5e6b818) to head (ff941ec).
Report is 8 commits behind head on master.

Additional details and impacted files

@@               Coverage Diff                @@
##             master     #57468        +/-   ##
================================================
+ Coverage   72.7875%   74.8176%   +2.0300%     
================================================
  Files          1676       1721        +45     
  Lines        463667     472204      +8537     
================================================
+ Hits         337492     353292     +15800     
+ Misses       105328      96775      -8553     
- Partials      20847      22137      +1290     

Flag	Coverage Δ
integration	49.2934% <18.2481%> (?)
unit	72.3249% <62.0438%> (+0.1378%)	⬆️

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	61.0221% <ø> (+15.5897%)	⬆️

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[CbcWestwolf]

Can we make these two fields private?

[fzzf678]

Of course these fields should be private, maybe later we can refactor this part and turn it private.

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: CbcWestwolf, 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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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2024-11-21 06:59:48.423419512 +0000 UTC m=+101376.043074025: ☑️ agreed by CbcWestwolf.
• 2024-11-21 07:46:06.038634619 +0000 UTC m=+104153.658289136: ☑️ agreed by tangenta.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-8.5: #57607.