Check out:
https://blogs.oracle.com/poonam/entry/understanding_cms_gc_logs
The young gen collection is stop the world that pauses application threads, and
a couple parts of CMS can as well. I would recommend disabling the
#JVM_OPTS="$JVM_OPTS -XX:PrintFLSStatistics=1"
line in your cassandra-
I understand that cassandra uses ParNew GC for New Gen and CMS for Old Gen
(tenured). I'm trying to interpret in the logs when a Full GC happens and
what kind of Full GC is used. It never says "Full GC" or anything like that.
But I see that whenever there's a line like
2014-09-15T18:04:1
