GC can absolutely cause a server to get marked down by a peer. See https://support.datastax.com/hc/en-us/articles/204226199-Common-Causes-of-GC-pauses
As for tuning again we use CMS but this thread has some good G1 info that I looked at while evaluating it: https://issues.apache.org/jira/browse/CASSANDRA-7486 Also Al's awesome tuning guide has some stuff, although its 2.1-centric so might not be 100% applicable https://tobert.github.io/pages/als-cassandra-21-tuning-guide.html On Tue, Feb 14, 2017 at 1:57 PM, Pranay akula <pranay.akula2...@gmail.com> wrote: > On couple of servers when cassandra service is down all i see only GC > pauses and load on these servers is not high when pauses happend, i haven't > found any thing else is that can be the reason or do i need to look at > something else ?? > > We are using G1GC any reference on how to adjust G1GC settings, as we can > not set New Heap in G1. > > > Thanks > Pranay. >
