[ti-chi-bot]

This is an automated cherry-pick of #24204

What is changed, added or deleted? (Required)

• Update multi-data-centers-in-one-city-deployment.md to use the current default Region size (256 MiB) instead of the outdated 96 MB.
• Keep the change scoped to the stale statement so the deployment guidance stays aligned with the current TiKV default used elsewhere in the docs.

Which TiDB version(s) do your changes apply to? (Required)

Tips for choosing the affected version(s):

By default, CHOOSE MASTER ONLY so your changes will be applied to the next TiDB major or minor releases. If your PR involves a product feature behavior change or a compatibility change, CHOOSE THE AFFECTED RELEASE BRANCH(ES) AND MASTER.

For details, see tips for choosing the affected versions.

• master (the latest development version)
• v8.5 (TiDB 8.5 versions)
• v8.4 (TiDB 8.4 versions)
• v8.3 (TiDB 8.3 versions)
• v8.2 (TiDB 8.2 versions)
• v8.1 (TiDB 8.1 versions)
• v7.5 (TiDB 7.5 versions)
• v7.1 (TiDB 7.1 versions)
• v6.5 (TiDB 6.5 versions)

What is the related PR or file link(s)?

• This PR is translated from:
• Other reference link(s):
  • docs: fix outdated Region size in multi-AZ deployment doc docs-cn#21964
  • docs: fix outdated Region size in TiDB Cloud glossary #24205

AI agent involvement

• The changes in this PR were primarily made by an AI agent on behalf of the PR author.

Do your changes match any of the following descriptions?

• Delete files
• Change aliases
• Need modification after applied to another branch
• Might cause conflicts after applied to another branch

Summary by CodeRabbit

• Documentation
  • Clarified the default estimated TiKV Region split size: 256 MiB for TiDB v8.4.0 and later, and 96 MiB for earlier versions.
  • The existing description of three-replica Raft groups and their scheduling across TiKV instances remains unchanged.

[coderabbitai]

No actionable comments were generated in the recent review.

Recent review info

Run configuration

• Source mode: Auto
• Repository: pingcap/docs
• Branch: release-8.5
• File: .coderabbit.yaml
• Commit: 934e83f
• Layers: Repository YAML
• Review profile: ASSERTIVE
• Plan: Advanced
• Run ID: 54ebfe54-4a28-4fda-8a2e-742bd07edca0

Commits

Reviewing files that changed from the base of the PR and between 934e83f and 3712a0c.

Files selected for processing: 1

• multi-data-centers-in-one-city-deployment.md

Included review availability: This review used your included allowance. Your plan provides up to 4 included reviews per hour; 3 remain after this review.

Walkthrough

The deployment guide now specifies estimated Region split sizes by TiDB version: 256 MiB for v8.4.0 and later, and 96 MiB for earlier versions.

Changes: Region split size documentation

Layer / File(s)	Summary
Document version-specific split sizes multi-data-centers-in-one-city-deployment.md	The Region description specifies a 256 MiB estimated split size for TiDB v8.4.0 and later, and 96 MiB for earlier versions.

Priority: Low

Estimated code review effort: 1 (Trivial) | ~3 minutes

Change: Bug fix

Possibly related PRs

• pingcap/docs#24204: Changes the same document to replace the outdated Region size with 256 MiB.
• pingcap/docs#24205: Updates the TiDB Cloud glossary with the same version-specific Region size.

Suggested reviewers: qiancai

Merge Risk: Minimal · up to 3712a

The deployment guidance update is limited in scope and presents no merge-blocking risk.

Pre-merge checks: 5

Check name	Status	Explanation
Title check		The title clearly identifies the documentation fix and the outdated Region size. It is concise and directly related to the main change.
Description check		The description includes the required change summary, affected versions, reference links, AI involvement, and change-type checklist. It explains the automated cherry-pick and the scope of the document…
Docstring Coverage		No eligible functions found in the changed files. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Documentation-only edits and deletions within survi…
Linked Issues check		Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check		Check skipped because no linked issues were found for this pull request.

Full details: Description check

Explanation

The description includes the required change summary, affected versions, reference links, AI involvement, and change-type checklist. It explains the automated cherry-pick and the scope of the documentation update.

Full details: Docstring Coverage

Explanation

No eligible functions found in the changed files. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Documentation-only edits and deletions within surviving functions are included; unchanged diff context and fully deleted functions are excluded. Analyzed 0 functions across 0 files. (1 skipped: 1 unsupported.)

Finishing Touches

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• Create a new PR

• Autofix · Keep fixing CodeRabbit findings and required CI, and resolving merge conflicts

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[lilin90]

/approve

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[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: lilin90

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