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HBase >> mail # user >> Region server Memory Use is double the -Xmx setting

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Region server Memory Use is double the -Xmx setting
We have a 50 node cluster replicating to a 6 node cluster. Both clusters
are running CDH4.1.2 and HBase 0.94.2.


Today we noticed that the region servers at our replica site are using
10GB more memory than the '-Xmx12288m' we have defined in hbase-env.sh


These region servers have been up since January 9, 2013.


Does anyone have suggestions about tracking down this additional memory


I'm not necessarily expecting the Region Server to stay right at the
12GB that we allocated, but having it running at 24GB is starting to
cause the servers to swap.


28544  prodcon   18   0 24.1g  23g  18m S 20.0 74.0   9071:34 java

28544:   /usr/java/jdk1.6.0_31/bin/java -XX:OnOutOfMemoryError=kill -9
%p -Xmx12288m -Dcom.sun.management.jmxr

emote.ssl=false -Dcom.sun.management.jmxremote.authenticate=false
-Dcom.sun.management.jmxremote.port=9021 -ea

-server -XX:+HeapDumpOnOutOfMemoryError -Xmn256m -XX:+UseParNewGC
-XX:+UseConcMarkSweepGC -XX:CMSInitiatingOc

cupancyFraction=70 -verbose:gc -XX:+PrintGCDetails
-XX:+PrintGCDateStamps -Xloggc:/drive1/hadoop/2.0/isoft/../

hbase/logs/gc-hbase.log -ea -server -XX:+HeapDumpOnOutOfMemoryError
-Xmn256m -XX




Ron Buckley








谢良 2013-01-23, 02:19
Buckley,Ron 2013-01-23, 15:19
Anoop Sam John 2013-01-24, 03:21
Buckley,Ron 2013-01-25, 02:11