Hi guys Using 1.2.11, when I try to rolling restart the cluster, any node I restart makes the whole cluster cpu load to increase, reaching a "red" state in opscenter (load from 3-4 to 20+). This happens once the node is back online.
The restarted node uses 100 % cpu for 5 - 10 min and sometimes drop mutations. I have tried to throttle handoff to 256 (instead of 1024), yet it doesn't seems to help that much. Disks are not the bottleneck. PARNEW GC increase a bit, but nothing problematic I think. Basically, what could be happening on node restart ? What is taking that much CPU on every machine ? There is no steal or iowait. What can I try to tune ?
