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lightning: set block size for pebble SSTWriter #59010

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lightning: set block size for pebble SSTWriter #59010

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@joechenrh joechenrh commented Jan 17, 2025 •
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What problem does this PR solve?

Issue Number: close #59014

Problem Summary:

For local sort using pebbles, it seems like the default block size (16K) is only set in index engine.

tidb/lightning/pkg/importer/table_import.go

Lines 460 to 465 in 543c334

idxEngineCfg.Local = backend.LocalEngineConfig{
Compact: threshold > 0,
CompactConcurrency: 4,
CompactThreshold: threshold,
BlockSize: int(rc.cfg.TikvImporter.BlockSize),
}

What changed and how does it work?

Set BlockSize to rc.cfg.TikvImporter.BlockSize.

Test was done on my local machine, which using lightning to import a single csv with 2 million rows and 250 columns.

In order to make a relatively fair comparison, I cleared the data and restart the cluster using tiup before each test.

Before:

image

After:

image

Check List

Tests

  • Unit test
  • Integration test
  • Manual test (add detailed scripts or steps below)
  • No need to test
    • I checked and no code files have been changed.

Side effects

  • Performance regression: Consumes more CPU
  • Performance regression: Consumes more Memory
  • Breaking backward compatibility

Documentation

  • Affects user behaviors
  • Contains syntax changes
  • Contains variable changes
  • Contains experimental features
  • Changes MySQL compatibility

Release note

Please refer to Release Notes Language Style Guide to write a quality release note.

None

@ti-chi-bot ti-chi-bot bot added do-not-merge/needs-linked-issue do-not-merge/needs-tests-checked release-note-none Denotes a PR that doesn't merit a release note. size/XS Denotes a PR that changes 0-9 lines, ignoring generated files. labels Jan 17, 2025
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tiprow bot commented Jan 17, 2025

Hi @joechenrh. Thanks for your PR.

PRs from untrusted users cannot be marked as trusted with /ok-to-test in this repo meaning untrusted PR authors can never trigger tests themselves. Collaborators can still trigger tests on the PR using /test all.

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codecov bot commented Jan 17, 2025 •
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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 73.4412%. Comparing base (36e8e34) to head (543c334).
Report is 33 commits behind head on master.

Additional details and impacted files 
@@               Coverage Diff                @@
##             master     #59010        +/-   ##
================================================
+ Coverage   73.0285%   73.4412%   +0.4127%     
================================================
  Files          1684       1716        +32     
  Lines        465663     479643     +13980     
================================================
+ Hits         340067     352256     +12189     
- Misses       104691     105565       +874     
- Partials      20905      21822       +917
Flag Coverage Δ
integration 45.6005% <100.0000%> (?)
unit 72.1917% <ø> (-0.0201%) ⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Components Coverage Δ
dumpling 52.6910% <ø> (ø)
parser ∅ <ø> (∅)
br 44.4962% <ø> (-0.7358%) ⬇️

@joechenrh joechenrh changed the title lightning: set block size for pebble SST in local sort lightning: set block size for pebble SSTWriter Jan 17, 2025
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ti-chi-bot bot commented Jan 22, 2025

[APPROVALNOTIFIER] This PR is NOT APPROVED

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Successfully merging this pull request may close these issues.

lightning doesn't use block size in configuration when opening SSTWriter
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