You have very large heap,it’s take most of cpu time in GC stage.you should in maximum set heap on 12GB and enable row cache to your cluster become faster.
On Friday, 24 August 2018, Mun Dega <mundeg...@gmail.com> wrote: > 120G data > 28G heap out of 48 on system > 9 node cluster, RF3 > > > On Thu, Aug 23, 2018, 17:19 Mohamadreza Rostami < > mohamadrezarosta...@gmail.com> wrote: > >> Hi, >> How much data do you have? How much RAM do your servers have? How much do >> you have a heep? >> On Thu, Aug 23, 2018 at 10:14 PM Mun Dega <mundeg...@gmail.com> wrote: >> >>> Hello, >>> >>> We recently upgraded from Cassandra 2.1 to 3.11.2 on one cluster. The >>> process went OK including upgradesstable but we started to experience high >>> latency for r/w, occasional OOM and long GC pause after. >>> >>> For the same cluster with 2.1, we didn't have any issues like this. We >>> also kept server specs, heap, all the same in post upgrade >>> >>> Has anyone else had similar issues going to 3.11 and what are the major >>> changes that could have such a major setback in the new version? >>> >>> Ma Dega >>> >>
