TiCDC incremental scan can usage too much CPU under some unkown conditions #16601
Description
Bug Report
What version of TiKV are you using?
v6.5.5.
However, I guess the issue also exists in all later versions.
What operating system and CPU are you using?
Doesn't matter.
Steps to reproduce
It can't be reprocued stably. The root cause is still unknown.
What did you expect?
TiCDC incremental scan shouldn't be too slow.
What did happened?
TiCDC incremental scan is too slow (about 30min), and incremental scan worker CPU usage is always 100%:
[2023/11/27 10:54:58.200 +08:00] [INFO] [replication_manager.go:635] ["schedulerv3: slow table"] [namespace=default] [changefeed=policy-t2o-36] [tableID=52592] [tableStatus=] [checkpointTs=445920115528303141] [resolvedTs=445920115528303141] [checkpointLag=57m32.250351282s]
