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gc_worker: reduce GC scan locks when meeting region cache miss #18385

Merged
merged 6 commits into from
Jul 30, 2020
Merged

gc_worker: reduce GC scan locks when meeting region cache miss #18385

merged 6 commits into from
Jul 30, 2020

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lysu
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@lysu lysu commented Jul 6, 2020 •
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What problem does this PR solve?

Issue Number: close #xxx

Problem Summary:

currently, gc worker will rescan locks when meet region cache miss error which makes slow scan job become more slow.

What is changed and how it works?

What's Changed, How it Works:

when region cache miss error(current is a fake epochNotMatch), it just indicates "maybe region has changed and we need to reload region from PD", we can continue resolve scan lock result if all lock still in that region.

this can help situations like:

  • lock and region hasn't changed but region cache expired
  • lock's region's key range didn't change but maybe add new peer(id is same but confVer or ver changed)
  • all lock has changed from region A to region B

but it didn't help the situation that:

  • lock's region has been split into two region

maybe we can improve it later(to avoid complex modification)

Related changes

  • 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

  • n/a

Release note

  • Reduce GC scan locks when meeting region cache miss

This change is Reviewable

@lysu lysu added type/enhancement The issue or PR belongs to an enhancement. component/GC labels Jul 6, 2020
@lysu lysu changed the title gcworker: reduce GC scan locks when meeting region cache miss gc_worker: reduce GC scan locks when meeting region cache miss Jul 6, 2020
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codecov bot commented Jul 6, 2020 •
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Codecov Report

Merging #18385 into master will decrease coverage by 0.0165%.
The diff coverage is 62.0689%.

@@               Coverage Diff                @@
##             master     #18385        +/-   ##
================================================
- Coverage   79.1461%   79.1296%   -0.0166%     
================================================
  Files           548        547         -1     
  Lines        147949     147726       -223     
================================================
- Hits         117096     116895       -201     
+ Misses        21369      21361         -8     
+ Partials       9484       9470        -14

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lysu commented Jul 6, 2020

/run-all-tests

@lysu lysu added this to the v3.0.17 milestone Jul 6, 2020
youjiali1995
youjiali1995 reviewed Jul 8, 2020
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Rest lgtm. But it's a little strange that don't solve the problem completely.

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@youjiali1995, @MyonKeminta, PTAL.

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@youjiali1995, @MyonKeminta, PTAL.

@lysu lysu modified the milestones: v3.0.17, v4.0.3 Jul 14, 2020
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LGTM

@ti-srebot ti-srebot added the status/LGT1 Indicates that a PR has LGTM 1. label Jul 14, 2020
@winoros winoros modified the milestones: v4.0.3, v4.0.4 Jul 15, 2020
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@youjiali1995, @coocood, @jackysp, @MyonKeminta, PTAL.

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MyonKeminta reviewed Jul 16, 2020
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rest LGTM

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@youjiali1995, @MyonKeminta, @coocood, @jackysp, PTAL.

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@youjiali1995, @MyonKeminta, @coocood, @jackysp, PTAL.

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Can we continue this or just merge this? @youjiali1995 @lysu

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@youjiali1995, @MyonKeminta, @coocood, @jackysp, PTAL.

@lysu lysu dismissed stale reviews from ti-srebot and jackysp via 7cc9877 July 30, 2020 05:12
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lysu commented Jul 30, 2020

/run-all-tests

@jackysp jackysp merged commit 43c2d30 into pingcap:master Jul 30, 2020
@lysu lysu deleted the dev-fix-gc-work-re-scan branch July 30, 2020 05:40
@ti-srebot ti-srebot mentioned this pull request Jul 30, 2020
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ti-srebot pushed a commit to ti-srebot/tidb that referenced this pull request Jul 30, 2020
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cherry pick pingcap#18385 to release-3.0
af27f1f 
Signed-off-by: ti-srebot <ti-srebot@pingcap.com>
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cherry pick to release-3.0 in PR #18874

@ti-srebot ti-srebot mentioned this pull request Jul 30, 2020
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cherry pick pingcap#18385 to release-3.1
2c34aaa 
Signed-off-by: ti-srebot <ti-srebot@pingcap.com>
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cherry pick to release-3.1 in PR #18875

ti-srebot pushed a commit to ti-srebot/tidb that referenced this pull request Jul 30, 2020
@lysu @ti-srebot
cherry pick pingcap#18385 to release-4.0
8977226 
Signed-off-by: ti-srebot <ti-srebot@pingcap.com>
@ti-srebot ti-srebot mentioned this pull request Jul 30, 2020
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cherry pick to release-4.0 in PR #18876

jackysp pushed a commit that referenced this pull request Jul 30, 2020
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cherry pick #18385 to release-4.0 (#18876)
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ti-srebot added a commit that referenced this pull request Aug 9, 2020
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gc_worker: reduce GC scan locks when meeting region cache miss (#18385)…
393c711 
… (#18875)

Signed-off-by: ti-srebot <ti-srebot@pingcap.com>
ti-srebot added a commit that referenced this pull request Aug 26, 2020
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gc_worker: reduce GC scan locks when meeting region cache miss (#18385)…
dae7cba 
… (#18874)

Signed-off-by: ti-srebot <ti-srebot@pingcap.com>
@youjiali1995 youjiali1995 mentioned this pull request Jan 7, 2021
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@lysu lysu mentioned this pull request Jan 7, 2021
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@MyonKeminta MyonKeminta MyonKeminta left review comments

@youjiali1995 youjiali1995 youjiali1995 left review comments

@jackysp jackysp jackysp approved these changes

@ti-srebot ti-srebot ti-srebot left review comments

@coocood coocood Awaiting requested review from coocood

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@lysu @ti-srebot @MyonKeminta @jackysp @youjiali1995 @winoros @imtbkcat