export HBASE_HEAPSIZE=16384
export HBASE_OFFHEAPSIZE=25g
export HBASE_MASTER_OPTS="$HBASE_MASTER_OPTS -Xmx16g -Xms16g -Xmn4g -Xss256k -XX:MaxPermSize=256m -XX:SurvivorRatio=2 -XX:+UseParNewGC -XX:ParallelGCThreads=12 -XX:+UseConcMarkSweepG
C -XX:ParallelCMSThreads=16 -XX:+CMSParallelRemarkEnabled -XX:MaxTenuringThreshold=15 -XX:+UseCMSCompactAtFullCollection -XX:+UseCMSInitiatingOccupancyOnly -XX:CMSInitiatingOccupan
cyFraction=70 -XX:-DisableExplicitGC -XX:+HeapDumpOnOutOfMemoryError -verbose:gc -XX:+PrintGCDetails -XX:+PrintGCTimeStamps -XX:+PrintGCDateStamps -Xloggc:/app/hbase/log/gc/gc-hbase-
hmaster-`hostname`.log"
export HBASE_REGIONSERVER_OPTS="$HBASE_REGIONSERVER_OPTS -XX:+UseG1GC -Xmx30g -Xms30g -XX:+UnlockExperimentalVMOptions -XX:MaxGCPauseMillis=100 -XX:-ResizePLAB -XX:+ParallelRefProcE
nabled -XX:+AlwaysPreTouch -XX:ParallelGCThreads=16 -XX:ConcGCThreads=8 -XX:G1HeapWastePercent=3 -XX:InitiatingHeapOccupancyPercent=35 -XX:G1MixedGCLiveThresholdPercent=85 -XX:MaxDir
ectMemorySize=25g -XX:G1NewSizePercent=1 -XX:G1MaxNewSizePercent=15 -verbose:gc -XX:+PrintGC -XX:+PrintGCDetails -XX:+PrintGCApplicationStoppedTime -XX:+PrintHeapAtGC -XX:+PrintGCDa
teStamps -XX:+PrintAdaptiveSizePolicy -XX:PrintSafepointStatisticsCount=1 -XX:PrintFLSStatistics=1 -Xloggc:/app/hbase/log/gc/gc-hbase-regionserver-`hostname`.log"
master 依然采用cms,regionserver 因为大堆的关系使用G1 ,Jdk 推荐 1.8.0_111 以上版本（好像大于1.8.0_92也行），优化效果及其明显。上篇关于regionserver cms 的并不是最优，。，。接下来会详细测试并更改上篇。