tikv: document periodic full compaction.

[afeinberg]

First-time contributors' checklist

• I've signed Contributor License Agreement that's required for repo owners to accept my contribution.

What is changed, added or deleted? (Required)

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)
• v7.6 (TiDB 7.6 versions)
• v7.5 (TiDB 7.5 versions)
• v7.4 (TiDB 7.4 versions)
• v7.3 (TiDB 7.3 versions)
• v7.1 (TiDB 7.1 versions)
• v6.5 (TiDB 6.5 versions)
• v6.1 (TiDB 6.1 versions)
• v5.4 (TiDB 5.4 versions)
• v5.3 (TiDB 5.3 versions)
• v5.2 (TiDB 5.2 versions)
• v5.1 (TiDB 5.1 versions)
• v5.0 (TiDB 5.0 versions)

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

• This PR is translated from:
• Other reference link(s):

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

[CLAassistant]

All committers have signed the CLA.

[afeinberg]

/cc @tonyxuqqi @Connor1996

[ti-chi-bot]

@tonyxuqqi: adding LGTM is restricted to approvers and reviewers in OWNERS files.

In response to this:

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.

[afeinberg]

/assign @tonyxuqqi

[afeinberg]

/assign @Oreoxmt

@Oreoxmt - feel free to merge this if it's good.

[LykxSassinator]

/cc @qiancai

[afeinberg]

Verified that we can change the max CPU dynamically. Adding it to dynamic-config.md

mysql> show config where type="tikv" and name="raftstore.periodic-full-compact-start-max-cpu";
+------+-----------------+-----------------------------------------------+-------+
| Type | Instance        | Name                                          | Value |
+------+-----------------+-----------------------------------------------+-------+
| tikv | 127.0.0.1:20161 | raftstore.periodic-full-compact-start-max-cpu | 0.5   |
| tikv | 127.0.0.1:20160 | raftstore.periodic-full-compact-start-max-cpu | 0.5   |
| tikv | 127.0.0.1:20162 | raftstore.periodic-full-compact-start-max-cpu | 0.5   |
+------+-----------------+-----------------------------------------------+-------+
3 rows in set (0.01 sec)

[afeinberg]

@Oreoxmt Thanks for the help! This is my first docs PR. I updated dynamic-config.md, feel free to merge whenever appropriate.

[afeinberg]

@qiancai @Oreoxmt thanks for the last updates. This looks good, do I need to do anything else for this to be merged?

[qiancai]

Rest LGTM

[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2023-12-14 08:27:10.939909633 +0000 UTC m=+517521.977136552: ☑️ agreed by Oreoxmt.
• 2023-12-28 01:47:55.50091483 +0000 UTC m=+1703166.538141758: ☑️ agreed by qiancai.

[Oreoxmt]

@afeinberg Thanks for your contribution. I will merge this PR after code freeze (Jan 8, 2024)

[afeinberg]

@afeinberg Thanks for your contribution. I will merge this PR after code freeze (Jan 8, 2024)

Thanks, @Oreoxmt

[afeinberg]

@Oreoxmt it is now 1/9/2024. Can you get this merged? Let me know if there's anything else I can do.

[Oreoxmt]

/approve

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: Oreoxmt

The full list of commands accepted by this bot can be found here.

The pull request process is described here

Needs approval from an approver in each of these files:

• OWNERS [Oreoxmt]

Approvers can indicate their approval by writing /approve in a comment
Approvers can cancel approval by writing /approve cancel in a comment