How-to: resolve " java.lang.OutOfMemoryError: unable to create new native thread" for hbase thrift

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Error:

Caused by: java.lang.OutOfMemoryError: unable to create new native thread
        at java.lang.Thread.start0(Native Method)
        at java.lang.Thread.start(Thread.java:714)
        at java.util.concurrent.ThreadPoolExecutor.addWorker(ThreadPoolExecutor.java:949)
        at java.util.concurrent.ThreadPoolExecutor.execute(ThreadPoolExecutor.java:1360)
        at org.apache.hadoop.hbase.client.ResultBoundedCompletionService.submit(ResultBoundedCompletionService.java:142)
        at org.apache.hadoop.hbase.client.ScannerCallableWithReplicas.addCallsForCurrentReplica(ScannerCallableWithReplicas.java:276)
        at org.apache.hadoop.hbase.client.ScannerCallableWithReplicas.call(ScannerCallableWithReplicas.java:165)
        at org.apache.hadoop.hbase.client.ScannerCallableWithReplicas.call(ScannerCallableWithReplicas.java:57)
        at org.apache.hadoop.hbase.client.RpcRetryingCaller.callWithoutRetries(RpcRetryingCaller.java:200)

Resolution:

Add following in /etc/security/limits.conf to set the 100000 as the maximum number of processs in your system for user hadoop.
hadoop soft nproc 100000
hadoop hard nproc 100000
Reference: http://ww2.cs.fsu.edu/~czhang/errors.html
Configure hbase-env.sh(Optional: based on your use case):
export HBASE_HEAPSIZE=8000(original is 20G)
export HBASE_REGIONSERVER_OPTS="$HBASE_REGIONSERVER_OPTS -Xmx8g -Xms8g -Xmn4g -XX:+UseParNewGC -XX:+UseConcMarkSweepGC -XX:CMSInitiatingOccupancyFraction=70 -verbose:gc -XX:+PrintGCDetails -XX:+PrintGCTimeStamps -Xloggc:$HBASE_LOG_DIR/gc--hbase.log"
Restart hbase and thrift(Without this, ulimit settings will not take effort)
stop-hbase.sh
start-hbase.sh
hbase-daemon.sh stop thrift
hbase-daemon.sh start thrift

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