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

What takes the most CPU? System or User?

 most of it is used by org.apache.cassandra.util.coalesceInternal and SepWorker.run

Did you try removing a problematic node and installing a brand new one (instead of re-adding)?
I did not install a new node, but did remove the problematic node and CPU load in all the cluster became normal again

When you decommissioned these nodes, did the high CPU "move" to other nodes (probably data model/query issues) or was it completely gone? (server issues)
it was completely gone