Hi all:
I've a  HDP big data cluster with 4 nodes and create by Ambari  the HBase is    
As running YCSB for benchmark the RegionServer instance or the Hmaster instance 
crashes which it's logs shows:

---------------------log start ---------------------
2016-10-12 23:48:13,591 INFO  [main-SendThread(Node1:2181)] 
zookeeper.ClientCnxn: Unable to read additional data from server sessionid 
0x157b7f5f0bc0005, likely server has closed socket, closing socket connection 
and attempting reconnect
2016-10-12 23:48:13,595 INFO  [HBase-Metrics2-1] impl.MetricsSinkAdapter: Sink 
timeline started
2016-10-12 23:48:13,606 INFO  [HBase-Metrics2-1] impl.MetricsSystemImpl: 
Scheduled snapshot period at 10 second(s).
2016-10-12 23:48:13,606 INFO  [HBase-Metrics2-1] impl.MetricsSystemImpl: HBase 
metrics system started
2016-10-12 23:48:14,496 INFO  [main-SendThread(Node4:2181)] 
zookeeper.ClientCnxn: Opening socket connection to server Node4/ 
Will not attempt to authenticate using SASL (unknown error)
2016-10-12 23:48:14,506 INFO  [main-SendThread(Node4:2181)] 
zookeeper.ClientCnxn: Socket connection established to Node4/, 
initiating session
2016-10-12 23:48:14,517 INFO  [main-SendThread(Node4:2181)] 
zookeeper.ClientCnxn: Unable to reconnect to ZooKeeper service, session 
0x157b7f5f0bc0005 has expired, closing socket connection
2016-10-12 23:48:14,517 FATAL [main-EventThread] regionserver.HRegionServer: 
ABORTING region server node1,16020,1476260847716: 
regionserver:16020-0x157b7f5f0bc0005, quorum=node2:2181,node1:2181,node4:2181, 
baseZNode=/hbase-unsecure regionserver:16020-0x157b7f5f0bc0005 received expired 
from ZooKeeper, aborting
org.apache.zookeeper.KeeperException$SessionExpiredException: KeeperErrorCode = 
Session expired
        at org.apache.zookeeper.ClientCnxn$EventThread.run(ClientCnxn.java:510)
2016-10-12 23:48:14,518 FATAL [main-EventThread] regionserver.HRegionServer: 
RegionServer abort: loaded coprocessors are: 
---------------------log end---------------------

After checked the log ,it shows  that the region server jvm paused a long time 
and the zkclient cannot send heartbeats, the session times out Which the 
'reference guide' had descripted 
http://hbase.apache.org/book.html#trouble.rs.runtime.zkexpired  .So a read the 
log detail and to find the  java GC event  but there's no  full gc occurred. 
And more a found the same symptom??in the  DataNode instance .

The node os is Centos7 maybe the  kernel  futex bug  ,after checking the bug 
was fixed in my OS .
 There's any other factor caused the problem except java GC?
Anyone who got the same problem ? Any ideas ?
Thank you .

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