Ticdc changefeed delay, sorter output events/s is 0

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This topic has been translated from a Chinese forum by GPT and might contain errors.

Original topic: ticdc changefeed延时,sorter output events/s为0

| username: Tiny

[TiDB Usage Environment] Production Environment
[TiDB Version] v5.4.3
[Encountered Problem: Phenomenon and Impact]
cdc changefeed intermittently delays by 10~50 minutes;
During the delay, observing the Grafana monitoring, it was found that sorter output event/s dropped to 0


At the same time, unified sorter on disk data size increased significantly

The pressure on downstream Kafka during the corresponding time period is also normal.

What could be causing the delay?

| username: Daniel-W | Original post link

Take a look at the monitoring of the CDC initial scan.

| username: Tiny | Original post link

Is it this one?

| username: Daniel-W | Original post link

No
TICDC —> TIKV panel has several Initial monitors, mainly looking at the Initial scan tasks status.

| username: Tiny | Original post link

All those monitoring panels under TiKV show “no data” o(╯□╰)o