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columnData2Column utilizes too much CPU in a single point component #11590

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hicqu opened this issue Sep 11, 2024 · 1 comment · May be fixed by #11595
Open

columnData2Column utilizes too much CPU in a single point component #11590

hicqu opened this issue Sep 11, 2024 · 1 comment · May be fixed by #11595
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area/ticdc Issues or PRs related to TiCDC. type/enhancement The issue or PR belongs to an enhancement.

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@hicqu
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hicqu commented Sep 11, 2024

What did you do?

Replicate a table with 2 unique keys, which are both union index.

What did you expect to see?

No response

What did you see instead?

Here is a result of CPU profile in 30s.

profiling_2024-09-11_20-43-08.zip

图片

The stack is very clear. model.columnData2Column utilizes almost one full core. And, GC also works in a heavy load.

The function model.columnData2Column is introduced in v8.1.0, but we don't know whether it exists in earlier versions or not.

Versions of the cluster

TiCDCs after v8.1.0.
@hicqu hicqu added type/bug The issue is confirmed as a bug. area/ticdc Issues or PRs related to TiCDC. labels Sep 11, 2024
@hicqu
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hicqu commented Sep 11, 2024

It slows down a changefeed obviously:
图片

This was referenced Sep 13, 2024
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@hicqu hicqu added type/enhancement The issue or PR belongs to an enhancement. and removed type/bug The issue is confirmed as a bug. labels Sep 13, 2024
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sink: avoid memory allocations for transforming ColumnData to Column hicqu/ticdc
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