ulimit -n 65536

export HBASE_OPTS="$HBASE_OPTS -XX:+HeapDumpOnOutOfMemoryError -XX:+UseConcMarkSweepGC -XX:+CMSIncrementalMode"

export HBASE_REGIONSERVER_OPTS="$HBASE_REGIONSERVER_OPTS -Xmx20g -Xms20g -Xmn512m -XX:+UseParNewGC -XX:+UseConcMarkSweepGC -XX:CMSIn
itiatingOccupancyFraction=60 -verbose:gc -XX:+PrintGCDetails -XX:+PrintGCTimeStamps -Xloggc:$HBASE_HOME/logs/gc-$(hostname)-hbase.lo
g"

        <property>
                <name>hbase.regionserver.handler.count</name>
                <value>16</value>
                <description>Count of RPC Listener instances spun up on RegionServers.
                Same property is used by the Master for count of master handlers.
                Default is 10.
                </description>
        </property>

        <property>
                <name>hbase.regionserver.global.memstore.upperLimit</name>
                <value>0.35</value>
                <description>Maximum size of all memstores in a region server before new
                updates are blocked and flushes are forced. Defaults to 40% of heap
                </description>
        </property>
        <property>
                <name>hbase.regionserver.global.memstore.lowerLimit</name>
                <value>0.3</value>
                <description>When memstores are being forced to flush to make room in
                memory, keep flushing until we hit this mark. Defaults to 35% of heap.
                This value equal to hbase.regionserver.global.memstore.upperLimit causes
                the minimum possible flushing to occur when updates are blocked due to
                memstore limiting.
                </description>
        </property>

        <property>
                <name>hfile.block.cache.size</name>
                <value>0.35</value>
                <description>
                Percentage of maximum heap (-Xmx setting) to allocate to block cache
                used by HFile/StoreFile. Default of 0.25 means allocate 25%.
                Set to 0 to disable but it's not recommended.
                </description>
        </property>

        <property>
                <name>zookeeper.session.timeout</name>
                <value>600000</value>
                <description>ZooKeeper session timeout.
                HBase passes this to the zk quorum as suggested maximum time for a
                session (This setting becomes zookeeper's 'maxSessionTimeout').  See
                http://hadoop.apache.org/zookeeper/docs/current/zookeeperProgrammers.html#ch_zkSessions
                "The client sends a requested timeout, the server responds with the
                timeout that it can give the client. " In milliseconds.
                </description>
        </property>

<property>
    <name>hbase.zookeeper.property.tickTime</name>
    <value>60000</value>
</property>

<property>
    <name>hbase.regionserver.restart.on.zk.expire</name>
    <value>true</value>
</property>

  <property>
    <name>hbase.hregion.majorcompaction</name>
    <value>0</value>
    <description>The time (in miliseconds) between 'major' compactions of all
    HStoreFiles in a region.  Default: 1 day(86400000).
    Set to 0 to disable automated major compactions.
    </description>
  </property>

  <property>
    <name>hbase.hregion.max.filesize</name>
    <value>536870912000</value>
    <description>
    Maximum HStoreFile size. If any one of a column families' HStoreFiles has
    grown to exceed this value, the hosting HRegion is split in two.
    Default: 1G(1073741824).  Set 500G, disable file split!
    </description>
  </property>