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From Joel Samuelsson <samuelsson.j...@gmail.com>
Subject Re: Reduce Cassandra GC
Date Mon, 17 Jun 2013 08:51:02 GMT
Just got a very long GC again. What am I to look for in the logging I just
enabled?


2013/6/17 Joel Samuelsson <samuelsson.joel@gmail.com>

> > If you are talking about 1.2.x then I also have memory problems on the
> idle cluster: java memory constantly slow grows up to limit, then spend
> long time for GC. I never seen such behaviour for  1.0.x and 1.1.x, where
> on idle cluster java memory stay on the same value.
>
> No I am running Cassandra 1.1.8.
>
> > Can you paste you gc config?
>
> I believe the relevant configs are these:
> # GC tuning options
> JVM_OPTS="$JVM_OPTS -XX:+UseParNewGC"
> JVM_OPTS="$JVM_OPTS -XX:+UseConcMarkSweepGC"
> JVM_OPTS="$JVM_OPTS -XX:+CMSParallelRemarkEnabled"
> JVM_OPTS="$JVM_OPTS -XX:SurvivorRatio=8"
> JVM_OPTS="$JVM_OPTS -XX:MaxTenuringThreshold=1"
> JVM_OPTS="$JVM_OPTS -XX:CMSInitiatingOccupancyFraction=75"
> JVM_OPTS="$JVM_OPTS -XX:+UseCMSInitiatingOccupancyOnly"
>
> I haven't changed anything in the environment config up until now.
>
> > Also can you take a heap dump at 2 diff points so that we can compare
> it?
>
> I can't access the machine at all during the stop-the-world freezes. Was
> that what you wanted me to try?
>
> > Uncomment the followings in "cassandra-env.sh".
> Done. Will post results as soon as I get a new stop-the-world gc.
>
> > If you are unable to find a JIRA, file one
>
> Unless this turns out to be a problem on my end, I will.
>

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