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From 谢良 <xieli...@xiaomi.com>
Subject 答复: Region server Memory Use is double the -Xmx setting
Date Wed, 23 Jan 2013 02:19:47 GMT
Please set "-XX:MaxDirectMemorySize" explicitly,  else the default is taking the value like
-Xmx in currenty JDK6, at least for jdk1.6.30+

Best Regards,
Liang
________________________________________
发件人: Buckley,Ron [buckleyr@oclc.org]
发送时间: 2013年1月23日 5:17
收件人: user@hbase.apache.org
主题: 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
use?



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.






PID    USER      PR  NI  VIRT  RES  SHR S %CPU %MEM    TIME+  COMMAND


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

x6365

http://intranet-wiki.oclc.org/wiki/XWC/XServe/SRU



http://intranet-wiki.oclc.org/wiki/FIND



http://intranet-wiki.oclc.org/wiki/Higgins


http://intranet-wiki.oclc.org/wiki/Firefly



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