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The following page has been changed by stack: http://wiki.apache.org/hadoop/PerformanceTuning ------------------------------------------------------------------------------ * Use a 64-bit platform, and a 64-bit JVM. * Your clients might need tuning: [http://ryantwopointoh.blogspot.com/2009/01/performance-of-hbase-importing.html] * Make sure that the command {{{java}}} implies {{{-server}}} on your machines, or else you will have to explicitly enable it. + * Are you swapping? JVMs hate swapping. Adjusting [http://www.sollers.ca/blog/2008/swappiness/ swappiness] may help. + * By default, each regionserver puts up 10 listeners only. Up it if you have measurable traffic (See hbase.regionserver.handler.count in hbase-default.xml). == HBase JVM and GC == @@ -30, +32 @@ To enable, in hbase-env.sh add: {{{ export HBASE_OPTS="-XX:+UseConcMarkSweepGC -verbose:gc -XX:+PrintGCDetails -XX:+PrintGCTimeStamps -Xloggc:/home/hadoop/hbase/logs/gc-hbase.log" }}} + + (As of 0.20.0 HBase, CMS is enabled by default). Adjust the log directory to wherever you log.
