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From Wayne <wav...@gmail.com>
Subject Re: mslab enabled jvm crash
Date Thu, 26 May 2011 17:42:36 GMT
I left parnew alone (did not add any settings). I also did not increase the
heap. 8g with 50% for memstore. Below are the JVM settings.

The errors I pasted occurred after running for only maybe 12 hours. The
cluster as a whole has been running for 24 hours with dropping a node, but
short time span CMFs are occurring.

Any recommendations?

export HBASE_OPTS="-XX:+UseCMSInitiatingOccupancyOnly
-XX:CMSInitiatingOccupancyFraction=65 -XX:+CMSParallelRemarkEnabled
-XX:+HeapDumpOnOutOfMemoryError -XX:+UseConcMarkSweepGC"


On Thu, May 26, 2011 at 1:30 PM, Stack <stack@duboce.net> wrote:

> On Thu, May 26, 2011 at 9:00 AM, Wayne <wav100@gmail.com> wrote:
> > Looking more closely I can see that we are still
> > getting Concurrent Mode Failures on some of the nodes but they are only
> > lasting for 10s so the nodes don't go away. Is this considered "normal"?
> > With CMSInitiatingOccupancyFraction=65 I would suspect this is not
> normal??
> >
> What configs. are you running with now?  It looks like you either left
> parnew as unbounded or else you set it to 256M max?   So you did not
> change the parnew size?  Did you up your heap size?  I see you are
> getting 'promotion failed'/'concurrent mode failure'.  How long has it
> been running now?
> St.Ack

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