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Fwd: Re: Re: High CPU usage on some of the nodes due to message coalesce

Any cron or other scheduler running on those nodes?

Lots of Java processes running simultaneously?
no, just Apache Cassandra

Heavy repair continuously running?

Lots of pending compactions?
none, the cpu goes to 100% on first seconds of insert (write load) so no memtable flushed yet, 

Is the number of CPU cores the same in all the nodes?
yes, 12

Did you try rebooting one of the nodes?
Yes, cold rebooted all of them once, no luck!

Thanks for your time