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statistics: enlarge capacity of ddlEventCh to 1000 (#39532) #39562

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This is an automated cherry-pick of #39532

What problem does this PR solve?

Issue Number: ref #38189 ref #36004

Problem Summary:

What is changed and how it works?

Enlarge the capacity of ddlEventCh to 1000, which can reduce the change of [ddl] fail to notify DDL event.

Check List

Tests

  • Unit test
  • Integration test
  • Manual test (add detailed scripts or steps below)
  • No code

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

Signed-off-by: ti-chi-bot <ti-community-prow-bot@tidb.io>
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[REVIEW NOTIFICATION]

This pull request has not been approved.

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@ti-chi-bot ti-chi-bot added do-not-merge/cherry-pick-not-approved release-note-none Denotes a PR that doesn't merit a release note. size/XS Denotes a PR that changes 0-9 lines, ignoring generated files. type/cherry-pick-for-release-5.3 labels Dec 1, 2022
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@ti-chi-bot: This cherry pick PR is for a release branch and has not yet been approved by release team.
Adding the do-not-merge/cherry-pick-not-approved label.

To merge this cherry pick, it must first be approved by the collaborators.

AFTER it has been approved by collaborators, please ping the release team in a comment to request a cherry pick review.

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.

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This pull request is closed because its related version has closed automatic cherry-picking.
If it's still needed, you can reopen it or just regenerate it using bot,
see:

https://prow.tidb.net/command-help#cherrypick
https://book.prow.tidb.net/#/plugins/cherrypicker

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