You’ll need to provide some more information such as: * Do you have monitoring on the cassandra cluster that shows the request latency ? Data Stax OpsCentre is good starting point.
* Is compaction keeping up ? Check with nodetool compactionstats * Is the GCInspector logging about long running ParNew ? (it only logs when it’s longer than 200ms) Cheers Aaron ----------------- Aaron Morton New Zealand @aaronmorton Co-Founder & Principal Consultant Apache Cassandra Consulting http://www.thelastpickle.com On 23/05/2014, at 10:35 pm, Alexey Sverdelov <alexey.sverde...@googlemail.com> wrote: > Hi all, > > I've noticed increased latency on our tomcat REST-service (average 30ms, max > > 2sec). We are using Cassandra 1.2.16 with official DataStax Java driver > v1.0.3. > > Our setup: > > * 2 DCs > * each DC: 7 nodes > * RF=5 > * Leveled compaction > > After cassandra restart on all nodes, the latencies are alright again > (average < 5ms, max 50ms). > > Any thoughts are greatly appreciated. > > Thanks, > Alexey
