i18n(ja): use one rendering for compaction in the release notes (part 2)

[yahonda]

What is changed, added or deleted? (Required)

Renders "compaction" (RocksDB, TiKV, TiFlash, and log backup compaction) as コンパクション instead of 圧縮 in the release notes. This is part 2 of the change in #24200, which covered the reference docs. 圧縮 is the established Japanese word for "compression", so using it for compaction made release notes such as 「圧縮率を自動的に調整」 (EN "adjusts the compaction rate") read as if they were about data compression.

This PR changes 92 lines in 48 files.

How each site was chosen

• Each of the 170 lines with 圧縮 in releases/ was matched with its EN line on release-8.5.
• If the EN line says compaction, compact, or compacted, the site was changed.
• If it says compress or compression, it was kept.
• 24 lines could not be matched automatically. Each was checked by hand against EN: 18 are compaction and 6 are compression.

Wording changes beyond the plain replacement

• releases/release-5.0.0-rc.md: 「圧縮率」 (EN "compaction rate", meaning speed) → 「コンパクション速度」. A plain replacement would be 「コンパクション率」, which reads like "compression ratio". The same feature's heading in release-5.0.0.md uses 「データコンパクション速度」.
• releases/release-8.5.5.md: 「圧縮ログバックアップ」 (EN "compacted log backups") → 「コンパクションされたログバックアップ」.

Kept as 圧縮 because EN says "compress" or "compression" (78 lines)

These include gRPC message compression, Dumpling and TiDB Lightning compression formats, zstd and lz4, TiFlash dt_compression_*, redo log compression, the MySQL compression protocol, and UNCOMPRESS(). The release-5.0.0.md heading 「TiFlashは、圧縮とデータソートにおけるI/Oリソースの使用を制限します」 is also kept, because EN says "compression and data sorting".

Configuration names, anchors, and code are unchanged.

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.

• i18n-ja-release-8.5 (TiDB Japanese documentation for TiDB 8.5 versions)

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

• This PR is translated from:
• Other reference link(s): i18n(ja): use one rendering for compaction in the reference docs (part 1) #24200

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

🤖 Generated with Claude Code

Summary by CodeRabbit

• Documentation
  • Updated Japanese release-note terminology across TiDB, TiKV, TiFlash, and Lightning to consistently describe data compaction, rather than compression.
  • Clarified references to compaction behavior, settings, metrics, and issue fixes; the documented functionality and configuration values remain unchanged.

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ℹ️ Recent review info

⚙️ Run configuration

• Configuration used: Repository: pingcap/docs/.coderabbit.yaml
• Review profile: ASSERTIVE
• Plan: Advanced
• Run ID: 0a9c619f-b8e8-4d2b-b0b7-8ff5128d1700

📥 Commits

Reviewing files that changed from the base of the PR and between c070372 and 0c742a6.

📒 Files selected for processing (48)

• releases/release-1.0-ga.md
• releases/release-2.0-ga.md
• releases/release-2.0-rc.3.md
• releases/release-2.1-ga.md
• releases/release-2.1-rc.1.md
• releases/release-2.1.4.md
• releases/release-3.0.0-beta.1.md
• releases/release-3.0.5.md
• releases/release-4.0.0-beta.md
• releases/release-4.0.11.md
• releases/release-4.0.5.md
• releases/release-5.0.0-rc.md
• releases/release-5.0.0.md
• releases/release-5.0.2.md
• releases/release-5.1.0.md
• releases/release-5.1.3.md
• releases/release-5.2.0.md
• releases/release-5.2.3.md
• releases/release-5.2.4.md
• releases/release-5.3.0.md
• releases/release-5.3.1.md
• releases/release-5.4.0.md
• releases/release-6.1.0.md
• releases/release-6.1.3.md
• releases/release-6.2.0.md
• releases/release-6.4.0.md
• releases/release-6.5.0.md
• releases/release-6.5.11.md
• releases/release-6.5.4.md
• releases/release-7.1.0.md
• releases/release-7.1.2.md
• releases/release-7.1.6.md
• releases/release-7.2.0.md
• releases/release-7.3.0.md
• releases/release-7.4.0.md
• releases/release-7.5.0.md
• releases/release-7.5.4.md
• releases/release-7.5.7.md
• releases/release-7.6.0.md
• releases/release-8.0.0.md
• releases/release-8.1.2.md
• releases/release-8.2.0.md
• releases/release-8.4.0.md
• releases/release-8.5.3.md
• releases/release-8.5.4.md
• releases/release-8.5.5.md
• releases/release-8.5.6.md
• releases/release-8.5.7.md

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📝 Walkthrough

Walkthrough

Release notes across TiDB versions replace compression terminology with compaction terminology in Japanese descriptions. The edits preserve the documented settings, conditions, and behavior.

Changes

Compaction terminology updates

Layer / File(s)	Summary
Early release notes releases/release-1.*, releases/release-2.*, releases/release-3.*, releases/release-4.*, releases/release-5.*	Entries in releases 1.0–5.4 use compaction terminology in place of compression terminology for TiKV, TiFlash, and Lightning.
Release notes for versions 6.x–7.4 releases/release-6.*, releases/release-7.1*, releases/release-7.2*, releases/release-7.3*, releases/release-7.4*	TiFlash feature descriptions, TiKV settings, and improvement entries use compaction terminology.
Release notes for versions 7.5–8.5 releases/release-7.5*, releases/release-7.6*, releases/release-8.*	TiKV settings and release entries use compaction terminology for compaction behavior.

Priority: ⬇️ Low

Estimated code review effort: 2 (Simple) | ~10 minutes

Change: Other

Suggested reviewers: qiancai

Merge Risk: ⚪ Minimal · up to 0c742

This PR updates Japanese release-note terminology without changing product behavior. No concrete user-facing or operational regression is supported, so it appears ready to merge after normal checks.

Architecture Summary

Architecture risk: 🔵 Low · up to 0c742

The change affects 1 system.

Changed systems: releases

Architecture concerns
No architecture-level concerns identified.

Review details

Systems and components

• observed — releases (service) was modified; 48 changed files map to changed impact.

Before / after behavior

• observed — Modified behavior in releases/release-1.0-ga.md: The TiKV entry changes the operation described as manually triggered for quickly freeing space from data compression to data compaction.
• observed — Modified behavior in releases/release-2.0-ga.md: TiKV の安定性に関する項目で、リージョンサイズ情報を随時更新する契機を圧縮イベントからコンパクションイベントに変更しました。
• observed — Modified behavior in releases/release-2.0-rc.3.md: TiKVの項目で、リージョンサイズ情報の更新を圧縮イベントに応じて行う記述を、コンパクションイベントに応じて行う記述に変更しました。
• observed — Modified behavior in releases/release-2.1-ga.md: compact コマンドが最下層のデータを圧縮するかどうかを指定できるという説明を、「圧縮」から「コンパクション」に変更しました。

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Docstring Coverage		No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 0…
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.
Description check		The description clearly explains the terminology changes, scope, selection method, exceptions, affected branch, related PR, AI involvement, and unchanged configuration details. It covers the required …
Title check		The title clearly identifies the Japanese localization change for compaction terminology in the release notes and indicates that this is part 2.

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[qiancai]

LGTM

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[LGTM Timeline notifier]

Timeline:

• 2026-10-10 02:54:58.251969909 +0000 UTC m=+440507.999200758: ☑️ agreed by qiancai.