Yes, I use compression. Tried without and it gave ~15% increase in speed, but is still too low (~35Mbps)
On sending side no high CPU/IO/etc utilization. But on receiving node I see that one "STREAM-IN" thread takes 100% CPU and it just doesn't scale by design since "Each stream is a single thread" ( http://www.mail-archive.com/user@cassandra.apache.org/msg42095.html) > > I'm trying to decommission one C* node from 6 nodes cluster and see that > > outbound network traffic on this node doesn't go over ~30Mb/s. > > Looks like it is throttled somewhere in C* > > Do you use compression? Try taking a thread dump and see what the > utilization of the sending threads are. > > > -- > Eric Evans > john.eric.ev...@gmail.com >
