Likely. I believe counter mutations are a tad more expensive than a normal mutation. If you're doing a lot of counter updates that probably doesn't help. Regardless, high amounts of pending reads/mutations is generally not good and indicates the node being overloaded. Are you just seeing this on the 1 node with IO issues or do other nodes have this problem as well?
On 3 September 2017 at 20:25, Rudi Bruchez <r...@babaluga.com> wrote: > Le 30/08/2017 à 05:33, Erick Ramirez a écrit : > > Is it possible at all that you may have a data hotspot if it's not > hardware-related? > > > It does not seem so, The partition key seems well distributed and the > queries update different keys. > > We have dropped counter_mutation messages in the log : > > COUNTER_MUTATION messages were dropped in last 5000 ms: 0 internal and 2 > cross node. Mean internal dropped latency: 0 ms and Mean cross-node dropped > latency: 5960 ms > > Pool Name Active Pending Completed Blocked > All Time Blocked > ReadStage 32 503 7481787 > 0 0 > CounterMutationStage 32 221 5722101 > 0 0 > > The load could be too high ? > > Thanks >
