create changfeed using openapi will cause cpu usage overload

[maxshuang]

What did you do?

(1) using a tidb + ticdc cluster using tiup

tiup playground v5.2.0 --pd 3 --db 3 --kv 3 --ticdc 3

(2) using openapi create a changefeed

 curl -X POST -H "'Content-type':'application/json'" http://127.0.0.1:8300/api/v1/changefeeds -d '{"changefeed_id":"test-resolvedLock","sink_uri":"mysql://root:123456@127.0.0.1:3306/"}'

What did you expect to see?

changefeed run normally

What did you see instead?

cpu usage up to 600% without any workload

flame graph as follow:

Versions of the cluster

Upstream TiDB cluster version (execute SELECT tidb_version(); in a MySQL client):

v5.2.0

TiCDC version (execute cdc version):

v5.2.0

[amyangfei]

Fixed by #3074