when the hotspot region is splitting constantly, data cannot be synchronized to downstream [restore for 5612]

[ti-chi-bot]

What did you do?

1. create a cluster on dbaas
2. create a changefeed on this cluster(cdc to mysql/kafka function)
3. Load data to the cluster(use go-tpc load tool)
4. Observation data synchronization

What did you expect to see?

Data is synchronized to downstream normally

What did you see instead?

data cannot be synchronized to downstream，the lag increases constantly

Versions of the cluster

tidb: 5.4.1
ticdc:5.4.1

current status of DM cluster (execute query-status <task-name> in dmctl)

(paste current status of DM cluster here)

[ti-chi-bot]

This issue is restored for #5612, it originally created at 2022-05-27 06:53:04.