MultiDC cluster, observing 100% CPU when connecting kafka debezium source conector

[amitesh88]

We have our multi dc setup with 3 node in dc1 and 3 in dc2 . Although both the DCs are in the same region n same subnet, This is done as we require separate clusters for reading n writing data.

Our setup creates a new table everyday at 12 midnight with cdc enabled in DC1

At the same time we also create a kafka debezium source connector to consume cdc logs from DC2 everyday

Issue:
At around 12
When creating a new source con , we observe scylladb servers on dc2 consumes 100% cpu.

We increased cpu from 16cores to 32 but still same behavior
Once the kafka connector creates its topic and start reading data from cdc log ,scylladb cpu cools down

Logs:

The logs in syslog shows reader_concurrency_semaphores for that time period.

Any expert thoughts is appreciated
Thanks in advance

[fruch]

This doesn't sound related to this repository

I would recommend raising an issue on the CDC connector repository

And attach logs of the connector and scylla

[mykaul]

@amitesh88 - isn't this a duplicate of scylladb/scylla-cdc-source-connector#47 ?

[amitesh88]

Yes its the same issue .Initially posted here but redirected to scylladb/scylla-cdc-source-connector#47