Grokbase Groups HBase user May 2011
We have two production clusters, and we don't on either. We also have
days and days worth of no CMF reported.

Here is my config that works great for us:

export HBASE_OPTS="$HBASE_OPTS -XX:+UseConcMarkSweepGC

# Uncomment below to enable java garbage collection logging.
export HBASE_OPTS="$HBASE_OPTS -verbose:gc -Xms12000m
-XX:CMSInitiatingOccupancyFraction=70 -XX:+PrintGCDetails
-XX:+HeapDumpOnOutOfMemoryError -Xloggc:$HBASE_HOME/logs/gc-hbase.log \
-XX:MaxTenuringThreshold=15 -XX:SurvivorRatio=8 \
-XX:+UseParNewGC \
-XX:NewSize=128m -XX:MaxNewSize=128m \
-XX:+CMSParallelRemarkEnabled \

Also, just reduce the size of your RAM flushes to minimum, we are
running on 0.19 and 0.20 for lower to high memstore limits, so our
flushes are usually small enough not to cause major fragmentation

On Mon, Jun 6, 2011 at 10:24 AM, Stack wrote:
On Mon, Jun 6, 2011 at 10:06 AM, Wayne wrote:
I had 25 sec CMF failure this morning...looks like bulk inserts are required
along with possibly weekly/daily scheduled rolling restarts. Do most
production clusters run rolling restarts on a regular basis to give the JVM
a fresh start?
We don't do it (maybe we should!).   Here is our bit of doc. on the
decommission script:
Its been working well for us; i.e. config. changes and upgrades while
under load.


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