pingcap / pingcap/ticdc

Unexpected incremental scan performance

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#1,661 0 comments 0 reactions 1 assignee View on GitHub

@lidezhu is already working on this.

Since Aug 18, 2025.

severity/moderate type/bug
Dominant language
Go
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56
Forks
63
Avg merge
2d 20h
Merged PRs (30d)
34

Description

In a scenario where a 6-node CDC performs incremental scans on 50 tables of a crwaler workload, the incremental scan occasionally behaves abnormally on one of the nodes.

Specifically, there is almost no traffic at the beginning, and then the incremental scan starts normally after a period of time. The tikv-cdc log shows that the incremental scan is very slow.

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