Hbase CMS GC 调优。

export HBASE_OPTS="-XX:+UseConcMarkSweepGC"

export HBASE_LOG_DIR=/app/hbase/log
export HBASE_PID_DIR=/app/hbase/tmp
export HBASE_HEAPSIZE=16384
export HBASE_OFFHEAPSIZE=25g

export HBASE_MASTER_OPTS="$HBASE_MASTER_OPTS -Xmx16g -Xms16g -Xmn4g -Xss256k -XX:MaxPermSize=256m -XX:SurvivorRatio=2 -XX:+UseParNewGC -XX:ParallelGCThreads=12 -XX:+UseConcMarkSweepGC
-XX:ParallelCMSThreads=16 -XX:+CMSParallelRemarkEnabled -XX:MaxTenuringThreshold=15 -XX:+UseCMSCompactAtFullCollection -XX:+UseCMSInitiatingOccupancyOnly -XX:CMSInitiatingOccupancy
Fraction=70 -XX:-DisableExplicitGC -XX:+HeapDumpOnOutOfMemoryError -verbose:gc -XX:+PrintGCDetails -XX:+PrintGCTimeStamps -XX:+PrintGCDateStamps -Xloggc:/app/hbase/log/gc/gc-hbase-hma
ster-`hostname`.log"

export HBASE_REGIONSERVER_OPTS="$HBASE_REGIONSERVER_OPTS -Xmx30g -Xms30g -Xmn2g -Xss256k -XX:MaxPermSize=256m -XX:SurvivorRatio=2 -XX:+UseParNewGC -XX:ParallelGCThreads=12 -XX:+UseC
oncMarkSweepGC -XX:ParallelCMSThreads=16 -XX:+CMSParallelRemarkEnabled -XX:MaxTenuringThreshold=15 -XX:+UseCMSCompactAtFullCollection -XX:+UseCMSInitiatingOccupancyOnly -XX:CMSInitia
tingOccupancyFraction=70 -XX:+HeapDumpOnOutOfMemoryError -verbose:gc -XX:+PrintGCDateStamps -XX:+PrintGCDetails -XX:+PrintGCTimeStamps -Xloggc:/app/hbase/log/gc/gc-hbase-regionserver-
`hostname`.log"

下一步调整G1 GC...