pingcap / pingcap/tiflash

Reduce the frequency of checkSegmentUpdate

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type/enhancement
Dominant language
C++
Stars
1k
Forks
423
Avg merge
1d 15h
Merged PRs (30d)
24

Description

Currently we call DeltaMergeStore::checkSegmentUpdate after each write, which is quite expensive. We should find a way to reduce the frequency.

Contributor guide

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First steps

  1. Read the whole issue, then the project's contributing guide.
  2. Comment on the issue to say you are picking it up — it saves two people doing the same work.
  3. Fork the repository and make your change on a branch.
  4. Open a pull request that references the issue number.

Research direction

Start by tracing where DeltaMergeStore::checkSegmentUpdate is called after writes and measure its cost and current call frequency. The issue does not name files, tests, or a target frequency; completion would require an agreed reduction that preserves correct segment updates.

Written by the indexing model from the issue text.

Assessment

Tech stack
cpp
Domain
databases
Issue type
Refactor
Difficulty
5/5
Estimated time
Over a week
Activity status
Stale
Clarity
Needs clarification
Newbie friendliness
25/100

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