Skip to content

GC: remove compact on split (#18500)#18732

Merged
ti-chi-bot[bot] merged 2 commits intotikv:release-7.5from
ti-chi-bot:cherry-pick-18500-to-release-7.5
Jul 23, 2025
Merged

GC: remove compact on split (#18500)#18732
ti-chi-bot[bot] merged 2 commits intotikv:release-7.5from
ti-chi-bot:cherry-pick-18500-to-release-7.5

Conversation

@ti-chi-bot
Copy link
Member

@ti-chi-bot ti-chi-bot commented Jul 21, 2025

This is an automated cherry-pick of #18500

What is changed and how it works?

Issue Number: Close #18451

What's Changed:

Remove compaction scheduling on split key not found error. 

Split key not found error is usually returned when a region only has a few keys but a large number of stale MVCC versions.
This was the incentive of scheduling a compaction on split error. However, this solution brings a more serious problem, i.e. worker threads starvation.
We don't really need this extra compaction, we expect that, after the compaction optimization is done, this MVCC accumulation issue would be mitigated. So, once the "split key not found" occurs, we just rely on the CheckThenCompact to resolve it.

Related changes

  • PR to update pingcap/docs/pingcap/docs-cn:
  • Need to cherry-pick to the release branch

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

Release note

None

@v01dstar @ti-chi-bot
This is an automated cherry-pick of tikv#18500
fc9f67e 
close tikv#18451

Signed-off-by: ti-chi-bot <ti-community-prow-bot@tidb.io>
@ti-chi-bot ti-chi-bot added dco-signoff: yes Indicates the PR's author has signed the dco. do-not-merge/hold Indicates that a PR should not merge because someone has issued a /hold command. release-note-none Denotes a PR that doesn't merit a release note. size/XL Denotes a PR that changes 500-999 lines, ignoring generated files. type/cherry-pick-for-release-7.5 This PR is cherry-picked to release-7.5 from a source PR. labels Jul 21, 2025
@ti-chi-bot ti-chi-bot mentioned this pull request Jul 21, 2025
Merged
9 tasks
@ti-chi-bot
Copy link
Member Author

ti-chi-bot commented Jul 21, 2025

@v01dstar This PR has conflicts, I have hold it.
Please resolve them or ask others to resolve them, then comment /unhold to remove the hold label.

@ti-chi-bot
Copy link
Contributor

ti-chi-bot bot commented Jul 21, 2025

@ti-chi-bot: ## If you want to know how to resolve it, please read the guide in TiDB Dev Guide.

Details

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 ti-community-infra/tichi repository.

@ti-chi-bot ti-chi-bot bot added size/L Denotes a PR that changes 100-499 lines, ignoring generated files. and removed size/XL Denotes a PR that changes 500-999 lines, ignoring generated files. labels Jul 21, 2025
@v01dstar
Resolve merge conflicts
aa6d8dc 
Signed-off-by: Yang Zhang <yang.zhang@pingcap.com>
@v01dstar v01dstar force-pushed the cherry-pick-18500-to-release-7.5 branch from 58693f0 to aa6d8dc Compare July 22, 2025 06:38
@ti-chi-bot ti-chi-bot bot added the needs-1-more-lgtm Indicates a PR needs 1 more LGTM. label Jul 22, 2025
@v01dstar
Copy link
Member

v01dstar commented Jul 22, 2025

/retest-required

Connor1996
Connor1996 approved these changes Jul 22, 2025
View reviewed changes
Copy link
Member

@Connor1996 Connor1996 left a comment

Choose a reason for hiding this comment

The reason will be displayed to describe this comment to others. Learn more.

LGTM

@ti-chi-bot
Copy link
Contributor

ti-chi-bot bot commented Jul 22, 2025

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: Connor1996, v01dstar

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

The pull request process is described here

Details Needs approval from an approver in each of these files:

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

@ti-chi-bot ti-chi-bot bot added lgtm approved and removed needs-1-more-lgtm Indicates a PR needs 1 more LGTM. labels Jul 22, 2025
@ti-chi-bot
Copy link
Contributor

ti-chi-bot bot commented Jul 22, 2025

[LGTM Timeline notifier]

Timeline:

  • 2025-07-22 06:54:04.939591622 +0000 UTC m=+61201.677017835: ☑️ agreed by v01dstar.
  • 2025-07-22 21:03:11.233878658 +0000 UTC m=+112147.971304870: ☑️ agreed by Connor1996.

@ti-chi-bot ti-chi-bot bot added cherry-pick-approved Cherry pick PR approved by release team. and removed do-not-merge/cherry-pick-not-approved labels Jul 23, 2025
@v01dstar
Copy link
Member

v01dstar commented Jul 23, 2025

/unhold

@ti-chi-bot ti-chi-bot bot removed the do-not-merge/hold Indicates that a PR should not merge because someone has issued a /hold command. label Jul 23, 2025
@ti-chi-bot ti-chi-bot bot merged commit 9dc258d into tikv:release-7.5 Jul 23, 2025
4 checks passed
Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment

Reviewers

@Connor1996 Connor1996 Connor1996 approved these changes

@v01dstar v01dstar v01dstar approved these changes

Assignees

@v01dstar v01dstar

Labels

approved cherry-pick-approved Cherry pick PR approved by release team. dco-signoff: yes Indicates the PR's author has signed the dco. lgtm release-note-none Denotes a PR that doesn't merit a release note. size/L Denotes a PR that changes 100-499 lines, ignoring generated files. type/cherry-pick-for-release-7.5 This PR is cherry-picked to release-7.5 from a source PR.

Projects

None yet

Milestone

No milestone

Development

Successfully merging this pull request may close these issues.

3 participants

@ti-chi-bot @v01dstar @Connor1996