Hi

One of our ensemble nodes is showing an erratic behavior:

   Jul 13 20:16:00 host12 zookeeper[26293]: [2017-07-13 20:16:00,500]
   WARN Cannot open channel to 13 at election address /10.0.0.13:3888
   (org.apache.zookeeper.server.quorum.QuorumCnxManager)
   Jul 13 20:16:00 host12 zookeeper[26293]:
   java.net.SocketTimeoutException: connect timed out
   Jul 13 20:16:00 host12 zookeeper[26293]: #011at
   java.net.PlainSocketImpl.socketConnect(Native Method)
   Jul 13 20:16:00 host12 zookeeper[26293]: #011at
   java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
   Jul 13 20:16:00 host12 zookeeper[26293]: #011at
   
java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
   Jul 13 20:16:00 host12 zookeeper[26293]: #011at
   java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
   Jul 13 20:16:00 host12 zookeeper[26293]: #011at
   java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
   Jul 13 20:16:00 host12 zookeeper[26293]: #011at
   java.net.Socket.connect(Socket.java:589)
   Jul 13 20:16:00 host12 zookeeper[26293]: #011at
   
org.apache.zookeeper.server.quorum.QuorumCnxManager.connectOne(QuorumCnxManager.java:443)
   Jul 13 20:16:00 host12 zookeeper[26293]: #011at
   
org.apache.zookeeper.server.quorum.QuorumCnxManager.connectOne(QuorumCnxManager.java:486)
   Jul 13 20:16:00 host12 zookeeper[26293]: #011at
   
org.apache.zookeeper.server.quorum.QuorumCnxManager.toSend(QuorumCnxManager.java:421)
   Jul 13 20:16:00 host12 zookeeper[26293]: #011at
   
org.apache.zookeeper.server.quorum.FastLeaderElection$Messenger$WorkerSender.process(FastLeaderElection.java:486)
   Jul 13 20:16:00 host12 zookeeper[26293]: #011at
   
org.apache.zookeeper.server.quorum.FastLeaderElection$Messenger$WorkerSender.run(FastLeaderElection.java:465)
   Jul 13 20:16:00 host12 zookeeper[26293]: #011at
   java.lang.Thread.run(Thread.java:748)
   Jul 13 20:17:00 host12 zookeeper[26293]: [2017-07-13 20:17:00,513]
   WARN Cannot open channel to 13 at election address /10.0.0.13:3888
   (org.apache.zookeeper.server.quorum.QuorumCnxManager)
   Jul 13 20:17:00 host12 zookeeper[26293]:
   java.net.SocketTimeoutException: connect timed out
   Jul 13 20:17:00 host12 zookeeper[26293]: #011at
   java.net.PlainSocketImpl.socketConnect(Native Method)
   Jul 13 20:17:00 host12 zookeeper[26293]: #011at
   java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
   Jul 13 20:17:00 host12 zookeeper[26293]: #011at
   
java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
   Jul 13 20:17:00 host12 zookeeper[26293]: #011at
   java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
   Jul 13 20:17:00 host12 zookeeper[26293]: #011at
   java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
   Jul 13 20:17:00 host12 zookeeper[26293]: #011at
   java.net.Socket.connect(Socket.java:589)
   Jul 13 20:17:00 host12 zookeeper[26293]: #011at
   
org.apache.zookeeper.server.quorum.QuorumCnxManager.connectOne(QuorumCnxManager.java:443)
   Jul 13 20:17:00 host12 zookeeper[26293]: #011at
   
org.apache.zookeeper.server.quorum.QuorumCnxManager.connectOne(QuorumCnxManager.java:486)
   Jul 13 20:17:00 host12 zookeeper[26293]: #011at
   
org.apache.zookeeper.server.quorum.QuorumCnxManager.toSend(QuorumCnxManager.java:421)
   Jul 13 20:17:00 host12 zookeeper[26293]: #011at
   
org.apache.zookeeper.server.quorum.FastLeaderElection$Messenger$WorkerSender.process(FastLeaderElection.java:486)
   Jul 13 20:17:00 host12 zookeeper[26293]: #011at
   
org.apache.zookeeper.server.quorum.FastLeaderElection$Messenger$WorkerSender.run(FastLeaderElection.java:465)
   Jul 13 20:17:00 host12 zookeeper[26293]: #011at
   java.lang.Thread.run(Thread.java:748)
   Jul 13 20:17:26 host12 zookeeper[26293]: [2017-07-13 20:17:26,649]
WARN Connection broken for id 12, my id = 11, error = (org.apache.zookeeper.server.quorum.QuorumCnxManager)
   Jul 13 20:17:26 host12 zookeeper[26293]: java.net.SocketException:
   Connection timed out (Read failed)
   Jul 13 20:17:26 host12 zookeeper[26293]: #011at
   java.net.SocketInputStream.socketRead0(Native Method)
   Jul 13 20:17:26 host12 zookeeper[26293]: #011at
   java.net.SocketInputStream.socketRead(SocketInputStream.java:116)
   Jul 13 20:17:26 host12 zookeeper[26293]: #011at
   java.net.SocketInputStream.read(SocketInputStream.java:171)
   Jul 13 20:17:26 host12 zookeeper[26293]: #011at
   java.net.SocketInputStream.read(SocketInputStream.java:141)
   Jul 13 20:17:26 host12 zookeeper[26293]: #011at
   java.net.SocketInputStream.read(SocketInputStream.java:224)
   Jul 13 20:17:26 host12 zookeeper[26293]: #011at
   java.io.DataInputStream.readInt(DataInputStream.java:387)
   Jul 13 20:17:26 host12 zookeeper[26293]: #011at
   
org.apache.zookeeper.server.quorum.QuorumCnxManager$RecvWorker.run(QuorumCnxManager.java:904)
   Jul 13 20:17:26 host12 zookeeper[26293]: [2017-07-13 20:17:26,649]
   WARN Interrupting SendWorker
   (org.apache.zookeeper.server.quorum.QuorumCnxManager)
   Jul 13 20:17:26 host12 zookeeper[26293]: [2017-07-13 20:17:26,650]
   WARN Interrupted while waiting for message on queue
   (org.apache.zookeeper.server.quorum.QuorumCnxManager)
   Jul 13 20:17:26 host12 zookeeper[26293]: java.lang.InterruptedException
   Jul 13 20:17:26 host12 zookeeper[26293]: #011at
   
java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.reportInterruptAfterWait(AbstractQueuedSynchronizer.java:2014)
   Jul 13 20:17:26 host12 zookeeper[26293]: #011at
   
java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.awaitNanos(AbstractQueuedSynchronizer.java:2088)
   Jul 13 20:17:26 host12 zookeeper[26293]: #011at
   java.util.concurrent.ArrayBlockingQueue.poll(ArrayBlockingQueue.java:418)
   Jul 13 20:17:26 host12 zookeeper[26293]: #011at
   
org.apache.zookeeper.server.quorum.QuorumCnxManager.pollSendQueue(QuorumCnxManager.java:986)
   Jul 13 20:17:26 host12 zookeeper[26293]: #011at
   
org.apache.zookeeper.server.quorum.QuorumCnxManager.access$500(QuorumCnxManager.java:65)
   Jul 13 20:17:26 host12 zookeeper[26293]: #011at
   
org.apache.zookeeper.server.quorum.QuorumCnxManager$SendWorker.run(QuorumCnxManager.java:824)
   Jul 13 20:17:26 host12 zookeeper[26293]: [2017-07-13 20:17:26,654]
   WARN Send worker leaving thread  id 12 my id = 11
   (org.apache.zookeeper.server.quorum.QuorumCnxManager)
   Jul 13 20:18:00 host12 zookeeper[26293]: [2017-07-13 20:18:00,501]
   WARN Cannot open channel to 12 at election address /10.0.0.12:3888
   (org.apache.zookeeper.server.quorum.QuorumCnxManager)
   Jul 13 20:18:00 host12 zookeeper[26293]:
   java.net.SocketTimeoutException: connect timed out
   Jul 13 20:18:00 host12 zookeeper[26293]: #011at
   java.net.PlainSocketImpl.socketConnect(Native Method)
   Jul 13 20:18:00 host12 zookeeper[26293]: #011at
   java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
   Jul 13 20:18:00 host12 zookeeper[26293]: #011at
   
java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
   Jul 13 20:18:00 host12 zookeeper[26293]: #011at
   java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
   Jul 13 20:18:00 host12 zookeeper[26293]: #011at
   java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
   Jul 13 20:18:00 host12 zookeeper[26293]: #011at
   java.net.Socket.connect(Socket.java:589)
   Jul 13 20:18:00 host12 zookeeper[26293]: #011at
   
org.apache.zookeeper.server.quorum.QuorumCnxManager.connectOne(QuorumCnxManager.java:443)
   Jul 13 20:18:00 host12 zookeeper[26293]: #011at
   
org.apache.zookeeper.server.quorum.QuorumCnxManager.connectOne(QuorumCnxManager.java:486)
   Jul 13 20:18:00 host12 zookeeper[26293]: #011at
   
org.apache.zookeeper.server.quorum.QuorumCnxManager.toSend(QuorumCnxManager.java:421)
   Jul 13 20:18:00 host12 zookeeper[26293]: #011at
   
org.apache.zookeeper.server.quorum.FastLeaderElection$Messenger$WorkerSender.process(FastLeaderElection.java:486)
   Jul 13 20:18:00 host12 zookeeper[26293]: #011at
   
org.apache.zookeeper.server.quorum.FastLeaderElection$Messenger$WorkerSender.run(FastLeaderElection.java:465)
   Jul 13 20:18:00 host12 zookeeper[26293]: #011at
   java.lang.Thread.run(Thread.java:748)
   Jul 13 20:18:05 host12 zookeeper[26293]: [2017-07-13 20:18:05,540]
   WARN Cannot open channel to 13 at election address /10.0.0.13:3888
   (org.apache.zookeeper.server.quorum.QuorumCnxManager)
   Jul 13 20:18:05 host12 zookeeper[26293]:
   java.net.SocketTimeoutException: connect timed out
   Jul 13 20:18:05 host12 zookeeper[26293]: #011at
   java.net.PlainSocketImpl.socketConnect(Native Method)
   Jul 13 20:18:05 host12 zookeeper[26293]: #011at
   java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
   Jul 13 20:18:05 host12 zookeeper[26293]: #011at
   
java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
   Jul 13 20:18:05 host12 zookeeper[26293]: #011at
   java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
   Jul 13 20:18:05 host12 zookeeper[26293]: #011at
   java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
   Jul 13 20:18:05 host12 zookeeper[26293]: #011at
   java.net.Socket.connect(Socket.java:589)
   Jul 13 20:18:05 host12 zookeeper[26293]: #011at
   
org.apache.zookeeper.server.quorum.QuorumCnxManager.connectOne(QuorumCnxManager.java:443)
   Jul 13 20:18:05 host12 zookeeper[26293]: #011at
   
org.apache.zookeeper.server.quorum.QuorumCnxManager.connectOne(QuorumCnxManager.java:486)
   Jul 13 20:18:05 host12 zookeeper[26293]: #011at
   
org.apache.zookeeper.server.quorum.QuorumCnxManager.toSend(QuorumCnxManager.java:421)
   Jul 13 20:18:05 host12 zookeeper[26293]: #011at
   
org.apache.zookeeper.server.quorum.FastLeaderElection$Messenger$WorkerSender.process(FastLeaderElection.java:486)
   Jul 13 20:18:05 host12 zookeeper[26293]: #011at
   
org.apache.zookeeper.server.quorum.FastLeaderElection$Messenger$WorkerSender.run(FastLeaderElection.java:465)
   Jul 13 20:18:05 host12 zookeeper[26293]: #011at
   java.lang.Thread.run(Thread.java:748)
   Jul 13 20:19:10 host12 zookeeper[26293]: [2017-07-13 20:19:10,548]
   WARN Cannot open channel to 12 at election address /10.0.0.12:3888
   (org.apache.zookeeper.server.quorum.QuorumCnxManager)
   Jul 13 20:19:10 host12 zookeeper[26293]:
   java.net.SocketTimeoutException: connect timed out
   Jul 13 20:19:10 host12 zookeeper[26293]: #011at
   java.net.PlainSocketImpl.socketConnect(Native Method)
   Jul 13 20:19:10 host12 zookeeper[26293]: #011at
   java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
   Jul 13 20:19:10 host12 zookeeper[26293]: #011at
   
java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
   Jul 13 20:19:10 host12 zookeeper[26293]: #011at
   java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
   Jul 13 20:19:10 host12 zookeeper[26293]: #011at
   java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
   Jul 13 20:19:10 host12 zookeeper[26293]: #011at
   java.net.Socket.connect(Socket.java:589)
   Jul 13 20:19:10 host12 zookeeper[26293]: #011at
   
org.apache.zookeeper.server.quorum.QuorumCnxManager.connectOne(QuorumCnxManager.java:443)
   Jul 13 20:19:10 host12 zookeeper[26293]: #011at
   
org.apache.zookeeper.server.quorum.QuorumCnxManager.connectOne(QuorumCnxManager.java:486)
   Jul 13 20:19:10 host12 zookeeper[26293]: #011at
   
org.apache.zookeeper.server.quorum.QuorumCnxManager.connectAll(QuorumCnxManager.java:514)
   Jul 13 20:19:10 host12 zookeeper[26293]: #011at
   
org.apache.zookeeper.server.quorum.FastLeaderElection.lookForLeader(FastLeaderElection.java:919)
   Jul 13 20:19:10 host12 zookeeper[26293]: #011at
   org.apache.zookeeper.server.quorum.QuorumPeer.run(QuorumPeer.java:1109)
   Jul 13 20:19:15 host12 zookeeper[26293]: [2017-07-13 20:19:15,554]
   WARN Cannot open channel to 13 at election address /10.0.0.13:3888
   (org.apache.zookeeper.server.quorum.QuorumCnxManager)
   Jul 13 20:19:15 host12 zookeeper[26293]:
   java.net.SocketTimeoutException: connect timed out
   Jul 13 20:19:15 host12 zookeeper[26293]: #011at
   java.net.PlainSocketImpl.socketConnect(Native Method)
   Jul 13 20:19:15 host12 zookeeper[26293]: #011at
   java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
   Jul 13 20:19:15 host12 zookeeper[26293]: #011at
   
java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
   Jul 13 20:19:15 host12 zookeeper[26293]: #011at
   java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
   Jul 13 20:19:15 host12 zookeeper[26293]: #011at
   java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
   Jul 13 20:19:15 host12 zookeeper[26293]: #011at
   java.net.Socket.connect(Socket.java:589)
   Jul 13 20:19:15 host12 zookeeper[26293]: #011at
   
org.apache.zookeeper.server.quorum.QuorumCnxManager.connectOne(QuorumCnxManager.java:443)
   Jul 13 20:19:15 host12 zookeeper[26293]: #011at
   
org.apache.zookeeper.server.quorum.QuorumCnxManager.connectOne(QuorumCnxManager.java:486)
   Jul 13 20:19:15 host12 zookeeper[26293]: #011at
   
org.apache.zookeeper.server.quorum.QuorumCnxManager.connectAll(QuorumCnxManager.java:514)
   Jul 13 20:19:15 host12 zookeeper[26293]: #011at
   
org.apache.zookeeper.server.quorum.FastLeaderElection.lookForLeader(FastLeaderElection.java:919)
   Jul 13 20:19:15 host12 zookeeper[26293]: #011at
   org.apache.zookeeper.server.quorum.QuorumPeer.run(QuorumPeer.java:1109)
   Jul 13 20:20:20 host12 zookeeper[26293]: [2017-07-13 20:20:20,561]
   WARN Cannot open channel to 12 at election address /10.0.0.12:3888
   (org.apache.zookeeper.server.quorum.QuorumCnxManager)
   Jul 13 20:20:20 host12 zookeeper[26293]:
   java.net.SocketTimeoutException: connect timed out
   Jul 13 20:20:20 host12 zookeeper[26293]: #011at
   java.net.PlainSocketImpl.socketConnect(Native Method)
   Jul 13 20:20:20 host12 zookeeper[26293]: #011at
   java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
   Jul 13 20:20:20 host12 zookeeper[26293]: #011at
   
java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
   Jul 13 20:20:20 host12 zookeeper[26293]: #011at
   java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
   Jul 13 20:20:20 host12 zookeeper[26293]: #011at
   java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
   Jul 13 20:20:20 host12 zookeeper[26293]: #011at
   java.net.Socket.connect(Socket.java:589)
   Jul 13 20:20:20 host12 zookeeper[26293]: #011at
   
org.apache.zookeeper.server.quorum.QuorumCnxManager.connectOne(QuorumCnxManager.java:443)
   Jul 13 20:20:20 host12 zookeeper[26293]: #011at
   
org.apache.zookeeper.server.quorum.QuorumCnxManager.connectOne(QuorumCnxManager.java:486)
   Jul 13 20:20:20 host12 zookeeper[26293]: #011at
   
org.apache.zookeeper.server.quorum.QuorumCnxManager.connectAll(QuorumCnxManager.java:514)
   Jul 13 20:20:20 host12 zookeeper[26293]: #011at
   
org.apache.zookeeper.server.quorum.FastLeaderElection.lookForLeader(FastLeaderElection.java:919)
   Jul 13 20:20:20 host12 zookeeper[26293]: #011at
   org.apache.zookeeper.server.quorum.QuorumPeer.run(QuorumPeer.java:1109)
   Jul 13 20:20:25 host12 zookeeper[26293]: [2017-07-13 20:20:25,565]
   WARN Cannot open channel to 13 at election address /10.0.0.13:3888
   (org.apache.zookeeper.server.quorum.QuorumCnxManager)
   Jul 13 20:20:25 host12 zookeeper[26293]:
   java.net.SocketTimeoutException: connect timed out
   Jul 13 20:20:25 host12 zookeeper[26293]: #011at
   java.net.PlainSocketImpl.socketConnect(Native Method)
   Jul 13 20:20:25 host12 zookeeper[26293]: #011at
   java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
   Jul 13 20:20:25 host12 zookeeper[26293]: #011at
   
java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
   Jul 13 20:20:25 host12 zookeeper[26293]: #011at
   java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
   Jul 13 20:20:25 host12 zookeeper[26293]: #011at
   java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
   Jul 13 20:20:25 host12 zookeeper[26293]: #011at
   java.net.Socket.connect(Socket.java:589)
   Jul 13 20:20:25 host12 zookeeper[26293]: #011at
   
org.apache.zookeeper.server.quorum.QuorumCnxManager.connectOne(QuorumCnxManager.java:443)
   Jul 13 20:20:25 host12 zookeeper[26293]: #011at
   
org.apache.zookeeper.server.quorum.QuorumCnxManager.connectOne(QuorumCnxManager.java:486)
   Jul 13 20:20:25 host12 zookeeper[26293]: #011at
   
org.apache.zookeeper.server.quorum.QuorumCnxManager.connectAll(QuorumCnxManager.java:514)
   Jul 13 20:20:25 host12 zookeeper[26293]: #011at
   
org.apache.zookeeper.server.quorum.FastLeaderElection.lookForLeader(FastLeaderElection.java:919)
   Jul 13 20:20:25 host12 zookeeper[26293]: #011at
   org.apache.zookeeper.server.quorum.QuorumPeer.run(QuorumPeer.java:1109)
   Jul 13 20:21:30 host12 zookeeper[26293]: [2017-07-13 20:21:30,569]
   WARN Cannot open channel to 12 at election address /10.0.0.12:3888
   (org.apache.zookeeper.server.quorum.QuorumCnxManager)
   Jul 13 20:21:30 host12 zookeeper[26293]:
   java.net.SocketTimeoutException: connect timed out
   Jul 13 20:21:30 host12 zookeeper[26293]: #011at
   java.net.PlainSocketImpl.socketConnect(Native Method)
   Jul 13 20:21:30 host12 zookeeper[26293]: #011at
   java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
   Jul 13 20:21:30 host12 zookeeper[26293]: #011at
   
java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
   Jul 13 20:21:30 host12 zookeeper[26293]: #011at
   java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
   Jul 13 20:21:30 host12 zookeeper[26293]: #011at
   java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
   Jul 13 20:21:30 host12 zookeeper[26293]: #011at
   java.net.Socket.connect(Socket.java:589)
   Jul 13 20:21:30 host12 zookeeper[26293]: #011at
   
org.apache.zookeeper.server.quorum.QuorumCnxManager.connectOne(QuorumCnxManager.java:443)
   Jul 13 20:21:30 host12 zookeeper[26293]: #011at
   
org.apache.zookeeper.server.quorum.QuorumCnxManager.connectOne(QuorumCnxManager.java:486)
   Jul 13 20:21:30 host12 zookeeper[26293]: #011at
   
org.apache.zookeeper.server.quorum.QuorumCnxManager.connectAll(QuorumCnxManager.java:514)
   Jul 13 20:21:30 host12 zookeeper[26293]: #011at
   
org.apache.zookeeper.server.quorum.FastLeaderElection.lookForLeader(FastLeaderElection.java:919)
   Jul 13 20:21:30 host12 zookeeper[26293]: #011at
   org.apache.zookeeper.server.quorum.QuorumPeer.run(QuorumPeer.java:1109)
   Jul 13 20:21:35 host12 zookeeper[26293]: [2017-07-13 20:21:35,572]
   WARN Cannot open channel to 13 at election address /10.0.0.13:3888
   (org.apache.zookeeper.server.quorum.QuorumCnxManager)
   Jul 13 20:21:35 host12 zookeeper[26293]:
   java.net.SocketTimeoutException: connect timed out
   Jul 13 20:21:35 host12 zookeeper[26293]: #011at
   java.net.PlainSocketImpl.socketConnect(Native Method)
   Jul 13 20:21:35 host12 zookeeper[26293]: #011at
   java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
   Jul 13 20:21:35 host12 zookeeper[26293]: #011at
   
java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
   Jul 13 20:21:35 host12 zookeeper[26293]: #011at
   java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
   Jul 13 20:21:35 host12 zookeeper[26293]: #011at
   java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
   Jul 13 20:21:35 host12 zookeeper[26293]: #011at
   java.net.Socket.connect(Socket.java:589)
   Jul 13 20:21:35 host12 zookeeper[26293]: #011at
   
org.apache.zookeeper.server.quorum.QuorumCnxManager.connectOne(QuorumCnxManager.java:443)
   Jul 13 20:21:35 host12 zookeeper[26293]: #011at
   
org.apache.zookeeper.server.quorum.QuorumCnxManager.connectOne(QuorumCnxManager.java:486)
   Jul 13 20:21:35 host12 zookeeper[26293]: #011at
   
org.apache.zookeeper.server.quorum.QuorumCnxManager.connectAll(QuorumCnxManager.java:514)
   Jul 13 20:21:35 host12 zookeeper[26293]: #011at
   
org.apache.zookeeper.server.quorum.FastLeaderElection.lookForLeader(FastLeaderElection.java:919)
   Jul 13 20:21:35 host12 zookeeper[26293]: #011at
   org.apache.zookeeper.server.quorum.QuorumPeer.run(QuorumPeer.java:1109)
   Jul 13 20:22:40 host12 zookeeper[26293]: [2017-07-13 20:22:40,575]
   WARN Cannot open channel to 12 at election address /10.0.0.12:3888
   (org.apache.zookeeper.server.quorum.QuorumCnxManager)
   Jul 13 20:22:40 host12 zookeeper[26293]:
   java.net.SocketTimeoutException: connect timed out
   Jul 13 20:22:40 host12 zookeeper[26293]: #011at
   java.net.PlainSocketImpl.socketConnect(Native Method)
   Jul 13 20:22:40 host12 zookeeper[26293]: #011at
   java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
   Jul 13 20:22:40 host12 zookeeper[26293]: #011at
   
java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
   Jul 13 20:22:40 host12 zookeeper[26293]: #011at
   java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
   Jul 13 20:22:40 host12 zookeeper[26293]: #011at
   java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
   Jul 13 20:22:40 host12 zookeeper[26293]: #011at
   java.net.Socket.connect(Socket.java:589)
   Jul 13 20:22:40 host12 zookeeper[26293]: #011at
   
org.apache.zookeeper.server.quorum.QuorumCnxManager.connectOne(QuorumCnxManager.java:443)
   Jul 13 20:22:40 host12 zookeeper[26293]: #011at
   
org.apache.zookeeper.server.quorum.QuorumCnxManager.connectOne(QuorumCnxManager.java:486)
   Jul 13 20:22:40 host12 zookeeper[26293]: #011at
   
org.apache.zookeeper.server.quorum.QuorumCnxManager.connectAll(QuorumCnxManager.java:514)
   Jul 13 20:22:40 host12 zookeeper[26293]: #011at
   
org.apache.zookeeper.server.quorum.FastLeaderElection.lookForLeader(FastLeaderElection.java:919)
   Jul 13 20:22:40 host12 zookeeper[26293]: #011at
   org.apache.zookeeper.server.quorum.QuorumPeer.run(QuorumPeer.java:1109)
   Jul 13 20:22:45 host12 zookeeper[26293]: [2017-07-13 20:22:45,584]
   WARN Cannot open channel to 13 at election address /10.0.0.13:3888
   (org.apache.zookeeper.server.quorum.QuorumCnxManager)
   Jul 13 20:22:45 host12 zookeeper[26293]:
   java.net.SocketTimeoutException: connect timed out
   Jul 13 20:22:45 host12 zookeeper[26293]: #011at
   java.net.PlainSocketImpl.socketConnect(Native Method)
   Jul 13 20:22:45 host12 zookeeper[26293]: #011at
   java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
   Jul 13 20:22:45 host12 zookeeper[26293]: #011at
   
java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
   Jul 13 20:22:45 host12 zookeeper[26293]: #011at
   java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
   Jul 13 20:22:45 host12 zookeeper[26293]: #011at
   java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
   Jul 13 20:22:45 host12 zookeeper[26293]: #011at
   java.net.Socket.connect(Socket.java:589)
   Jul 13 20:22:45 host12 zookeeper[26293]: #011at
   
org.apache.zookeeper.server.quorum.QuorumCnxManager.connectOne(QuorumCnxManager.java:443)
   Jul 13 20:22:45 host12 zookeeper[26293]: #011at
   
org.apache.zookeeper.server.quorum.QuorumCnxManager.connectOne(QuorumCnxManager.java:486)
   Jul 13 20:22:45 host12 zookeeper[26293]: #011at
   
org.apache.zookeeper.server.quorum.QuorumCnxManager.connectAll(QuorumCnxManager.java:514)
   Jul 13 20:22:45 host12 zookeeper[26293]: #011at
   
org.apache.zookeeper.server.quorum.FastLeaderElection.lookForLeader(FastLeaderElection.java:919)
   Jul 13 20:22:45 host12 zookeeper[26293]: #011at
   org.apache.zookeeper.server.quorum.QuorumPeer.run(QuorumPeer.java:1109)
   Jul 13 20:23:50 host12 zookeeper[26293]: [2017-07-13 20:23:50,591]
   WARN Cannot open channel to 12 at election address /10.0.0.12:3888
   (org.apache.zookeeper.server.quorum.QuorumCnxManager)
   Jul 13 20:23:50 host12 zookeeper[26293]:
   java.net.SocketTimeoutException: connect timed out
   Jul 13 20:23:50 host12 zookeeper[26293]: #011at
   java.net.PlainSocketImpl.socketConnect(Native Method)
   Jul 13 20:23:50 host12 zookeeper[26293]: #011at
   java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
   Jul 13 20:23:50 host12 zookeeper[26293]: #011at
   
java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
   Jul 13 20:23:50 host12 zookeeper[26293]: #011at
   java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
   Jul 13 20:23:50 host12 zookeeper[26293]: #011at
   java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
   Jul 13 20:23:50 host12 zookeeper[26293]: #011at
   java.net.Socket.connect(Socket.java:589)
   Jul 13 20:23:50 host12 zookeeper[26293]: #011at
   
org.apache.zookeeper.server.quorum.QuorumCnxManager.connectOne(QuorumCnxManager.java:443)
   Jul 13 20:23:50 host12 zookeeper[26293]: #011at
   
org.apache.zookeeper.server.quorum.QuorumCnxManager.connectOne(QuorumCnxManager.java:486)
   Jul 13 20:23:50 host12 zookeeper[26293]: #011at
   
org.apache.zookeeper.server.quorum.QuorumCnxManager.connectAll(QuorumCnxManager.java:514)
   Jul 13 20:23:50 host12 zookeeper[26293]: #011at
   
org.apache.zookeeper.server.quorum.FastLeaderElection.lookForLeader(FastLeaderElection.java:919)
   Jul 13 20:23:50 host12 zookeeper[26293]: #011at
   org.apache.zookeeper.server.quorum.QuorumPeer.run(QuorumPeer.java:1109)
   Jul 13 20:23:55 host12 zookeeper[26293]: [2017-07-13 20:23:55,596]
   WARN Cannot open channel to 13 at election address /10.0.0.13:3888
   (org.apache.zookeeper.server.quorum.QuorumCnxManager)
   Jul 13 20:23:55 host12 zookeeper[26293]:
   java.net.SocketTimeoutException: connect timed out
   Jul 13 20:23:55 host12 zookeeper[26293]: #011at
   java.net.PlainSocketImpl.socketConnect(Native Method)
   Jul 13 20:23:55 host12 zookeeper[26293]: #011at
   java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
   Jul 13 20:23:55 host12 zookeeper[26293]: #011at
   
java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
   Jul 13 20:23:55 host12 zookeeper[26293]: #011at
   java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
   Jul 13 20:23:55 host12 zookeeper[26293]: #011at
   java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
   Jul 13 20:23:55 host12 zookeeper[26293]: #011at
   java.net.Socket.connect(Socket.java:589)
   Jul 13 20:23:55 host12 zookeeper[26293]: #011at
   
org.apache.zookeeper.server.quorum.QuorumCnxManager.connectOne(QuorumCnxManager.java:443)
   Jul 13 20:23:55 host12 zookeeper[26293]: #011at
   
org.apache.zookeeper.server.quorum.QuorumCnxManager.connectOne(QuorumCnxManager.java:486)
   Jul 13 20:23:55 host12 zookeeper[26293]: #011at
   
org.apache.zookeeper.server.quorum.QuorumCnxManager.connectAll(QuorumCnxManager.java:514)
   Jul 13 20:23:55 host12 zookeeper[26293]: #011at
   
org.apache.zookeeper.server.quorum.FastLeaderElection.lookForLeader(FastLeaderElection.java:919)
   Jul 13 20:23:55 host12 zookeeper[26293]: #011at
   org.apache.zookeeper.server.quorum.QuorumPeer.run(QuorumPeer.java:1109)
   Jul 13 20:25:00 host12 zookeeper[26293]: [2017-07-13 20:25:00,600]
   WARN Cannot open channel to 12 at election address /10.0.0.12:3888
   (org.apache.zookeeper.server.quorum.QuorumCnxManager)
   Jul 13 20:25:00 host12 zookeeper[26293]:
   java.net.SocketTimeoutException: connect timed out
   Jul 13 20:25:00 host12 zookeeper[26293]: #011at
   java.net.PlainSocketImpl.socketConnect(Native Method)
   Jul 13 20:25:00 host12 zookeeper[26293]: #011at
   java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
   Jul 13 20:25:00 host12 zookeeper[26293]: #011at
   
java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
   Jul 13 20:25:00 host12 zookeeper[26293]: #011at
   java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
   Jul 13 20:25:00 host12 zookeeper[26293]: #011at
   java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
   Jul 13 20:25:00 host12 zookeeper[26293]: #011at
   java.net.Socket.connect(Socket.java:589)
   Jul 13 20:25:00 host12 zookeeper[26293]: #011at
   
org.apache.zookeeper.server.quorum.QuorumCnxManager.connectOne(QuorumCnxManager.java:443)
   Jul 13 20:25:00 host12 zookeeper[26293]: #011at
   
org.apache.zookeeper.server.quorum.QuorumCnxManager.connectOne(QuorumCnxManager.java:486)
   Jul 13 20:25:00 host12 zookeeper[26293]: #011at
   
org.apache.zookeeper.server.quorum.QuorumCnxManager.connectAll(QuorumCnxManager.java:514)
   Jul 13 20:25:00 host12 zookeeper[26293]: #011at
   
org.apache.zookeeper.server.quorum.FastLeaderElection.lookForLeader(FastLeaderElection.java:919)
   Jul 13 20:25:00 host12 zookeeper[26293]: #011at
   org.apache.zookeeper.server.quorum.QuorumPeer.run(QuorumPeer.java:1109)
   Jul 13 20:25:05 host12 zookeeper[26293]: [2017-07-13 20:25:05,604]
   WARN Cannot open channel to 13 at election address /10.0.0.13:3888
   (org.apache.zookeeper.server.quorum.QuorumCnxManager)
   Jul 13 20:25:05 host12 zookeeper[26293]:
   java.net.SocketTimeoutException: connect timed out
   Jul 13 20:25:05 host12 zookeeper[26293]: #011at
   java.net.PlainSocketImpl.socketConnect(Native Method)
   Jul 13 20:25:05 host12 zookeeper[26293]: #011at
   java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
   Jul 13 20:25:05 host12 zookeeper[26293]: #011at
   
java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
   Jul 13 20:25:05 host12 zookeeper[26293]: #011at
   java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
   Jul 13 20:25:05 host12 zookeeper[26293]: #011at
   java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
   Jul 13 20:25:05 host12 zookeeper[26293]: #011at
   java.net.Socket.connect(Socket.java:589)
   Jul 13 20:25:05 host12 zookeeper[26293]: #011at
   
org.apache.zookeeper.server.quorum.QuorumCnxManager.connectOne(QuorumCnxManager.java:443)
   Jul 13 20:25:05 host12 zookeeper[26293]: #011at
   
org.apache.zookeeper.server.quorum.QuorumCnxManager.connectOne(QuorumCnxManager.java:486)
   Jul 13 20:25:05 host12 zookeeper[26293]: #011at
   
org.apache.zookeeper.server.quorum.QuorumCnxManager.connectAll(QuorumCnxManager.java:514)
   Jul 13 20:25:05 host12 zookeeper[26293]: #011at
   
org.apache.zookeeper.server.quorum.FastLeaderElection.lookForLeader(FastLeaderElection.java:919)
   Jul 13 20:25:05 host12 zookeeper[26293]: #011at
   org.apache.zookeeper.server.quorum.QuorumPeer.run(QuorumPeer.java:1109)
   Jul 13 20:26:10 host12 zookeeper[26293]: [2017-07-13 20:26:10,612]
   WARN Cannot open channel to 12 at election address /10.0.0.12:3888
   (org.apache.zookeeper.server.quorum.QuorumCnxManager)
   Jul 13 20:26:10 host12 zookeeper[26293]:
   java.net.SocketTimeoutException: connect timed out
   Jul 13 20:26:10 host12 zookeeper[26293]: #011at
   java.net.PlainSocketImpl.socketConnect(Native Method)
   Jul 13 20:26:10 host12 zookeeper[26293]: #011at
   java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
   Jul 13 20:26:10 host12 zookeeper[26293]: #011at
   
java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
   Jul 13 20:26:10 host12 zookeeper[26293]: #011at
   java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
   Jul 13 20:26:10 host12 zookeeper[26293]: #011at
   java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
   Jul 13 20:26:10 host12 zookeeper[26293]: #011at
   java.net.Socket.connect(Socket.java:589)
   Jul 13 20:26:10 host12 zookeeper[26293]: #011at
   
org.apache.zookeeper.server.quorum.QuorumCnxManager.connectOne(QuorumCnxManager.java:443)
   Jul 13 20:26:10 host12 zookeeper[26293]: #011at
   
org.apache.zookeeper.server.quorum.QuorumCnxManager.connectOne(QuorumCnxManager.java:486)
   Jul 13 20:26:10 host12 zookeeper[26293]: #011at
   
org.apache.zookeeper.server.quorum.QuorumCnxManager.connectAll(QuorumCnxManager.java:514)
   Jul 13 20:26:10 host12 zookeeper[26293]: #011at
   
org.apache.zookeeper.server.quorum.FastLeaderElection.lookForLeader(FastLeaderElection.java:919)
   Jul 13 20:26:10 host12 zookeeper[26293]: #011at
   org.apache.zookeeper.server.quorum.QuorumPeer.run(QuorumPeer.java:1109)
   Jul 13 20:26:15 host12 zookeeper[26293]: [2017-07-13 20:26:15,625]
   WARN Cannot open channel to 13 at election address /10.0.0.13:3888
   (org.apache.zookeeper.server.quorum.QuorumCnxManager)
   Jul 13 20:26:15 host12 zookeeper[26293]:
   java.net.SocketTimeoutException: connect timed out
   Jul 13 20:26:15 host12 zookeeper[26293]: #011at
   java.net.PlainSocketImpl.socketConnect(Native Method)
   Jul 13 20:26:15 host12 zookeeper[26293]: #011at
   java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
   Jul 13 20:26:15 host12 zookeeper[26293]: #011at
   
java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
   Jul 13 20:26:15 host12 zookeeper[26293]: #011at
   java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
   Jul 13 20:26:15 host12 zookeeper[26293]: #011at
   java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
   Jul 13 20:26:15 host12 zookeeper[26293]: #011at
   java.net.Socket.connect(Socket.java:589)
   Jul 13 20:26:15 host12 zookeeper[26293]: #011at
   
org.apache.zookeeper.server.quorum.QuorumCnxManager.connectOne(QuorumCnxManager.java:443)
   Jul 13 20:26:15 host12 zookeeper[26293]: #011at
   
org.apache.zookeeper.server.quorum.QuorumCnxManager.connectOne(QuorumCnxManager.java:486)
   Jul 13 20:26:15 host12 zookeeper[26293]: #011at
   
org.apache.zookeeper.server.quorum.QuorumCnxManager.connectAll(QuorumCnxManager.java:514)
   Jul 13 20:26:15 host12 zookeeper[26293]: #011at
   
org.apache.zookeeper.server.quorum.FastLeaderElection.lookForLeader(FastLeaderElection.java:919)
   Jul 13 20:26:15 host12 zookeeper[26293]: #011at
   org.apache.zookeeper.server.quorum.QuorumPeer.run(QuorumPeer.java:1109)
   Jul 13 20:27:20 host12 zookeeper[26293]: [2017-07-13 20:27:20,632]
   WARN Cannot open channel to 12 at election address /10.0.0.12:3888
   (org.apache.zookeeper.server.quorum.QuorumCnxManager)
   Jul 13 20:27:20 host12 zookeeper[26293]:
   java.net.SocketTimeoutException: connect timed out
   Jul 13 20:27:20 host12 zookeeper[26293]: #011at
   java.net.PlainSocketImpl.socketConnect(Native Method)
   Jul 13 20:27:20 host12 zookeeper[26293]: #011at
   java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
   Jul 13 20:27:20 host12 zookeeper[26293]: #011at
   
java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
   Jul 13 20:27:20 host12 zookeeper[26293]: #011at
   java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
   Jul 13 20:27:20 host12 zookeeper[26293]: #011at
   java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
   Jul 13 20:27:20 host12 zookeeper[26293]: #011at
   java.net.Socket.connect(Socket.java:589)
   Jul 13 20:27:20 host12 zookeeper[26293]: #011at
   
org.apache.zookeeper.server.quorum.QuorumCnxManager.connectOne(QuorumCnxManager.java:443)
   Jul 13 20:27:20 host12 zookeeper[26293]: #011at
   
org.apache.zookeeper.server.quorum.QuorumCnxManager.connectOne(QuorumCnxManager.java:486)
   Jul 13 20:27:20 host12 zookeeper[26293]: #011at
   
org.apache.zookeeper.server.quorum.QuorumCnxManager.connectAll(QuorumCnxManager.java:514)
   Jul 13 20:27:20 host12 zookeeper[26293]: #011at
   
org.apache.zookeeper.server.quorum.FastLeaderElection.lookForLeader(FastLeaderElection.java:919)
   Jul 13 20:27:20 host12 zookeeper[26293]: #011at
   org.apache.zookeeper.server.quorum.QuorumPeer.run(QuorumPeer.java:1109)
   Jul 13 20:27:25 host12 zookeeper[26293]: [2017-07-13 20:27:25,635]
   WARN Cannot open channel to 13 at election address /10.0.0.13:3888
   (org.apache.zookeeper.server.quorum.QuorumCnxManager)
   Jul 13 20:27:25 host12 zookeeper[26293]:
   java.net.SocketTimeoutException: connect timed out
   Jul 13 20:27:25 host12 zookeeper[26293]: #011at
   java.net.PlainSocketImpl.socketConnect(Native Method)
   Jul 13 20:27:25 host12 zookeeper[26293]: #011at
   java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
   Jul 13 20:27:25 host12 zookeeper[26293]: #011at
   
java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
   Jul 13 20:27:25 host12 zookeeper[26293]: #011at
   java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
   Jul 13 20:27:25 host12 zookeeper[26293]: #011at
   java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
   Jul 13 20:27:25 host12 zookeeper[26293]: #011at
   java.net.Socket.connect(Socket.java:589)
   Jul 13 20:27:25 host12 zookeeper[26293]: #011at
   
org.apache.zookeeper.server.quorum.QuorumCnxManager.connectOne(QuorumCnxManager.java:443)
   Jul 13 20:27:25 host12 zookeeper[26293]: #011at
   
org.apache.zookeeper.server.quorum.QuorumCnxManager.connectOne(QuorumCnxManager.java:486)
   Jul 13 20:27:25 host12 zookeeper[26293]: #011at
   
org.apache.zookeeper.server.quorum.QuorumCnxManager.connectAll(QuorumCnxManager.java:514)
   Jul 13 20:27:25 host12 zookeeper[26293]: #011at
   
org.apache.zookeeper.server.quorum.FastLeaderElection.lookForLeader(FastLeaderElection.java:919)
   Jul 13 20:27:25 host12 zookeeper[26293]: #011at
   org.apache.zookeeper.server.quorum.QuorumPeer.run(QuorumPeer.java:1109)
   Jul 13 20:28:30 host12 zookeeper[26293]: [2017-07-13 20:28:30,640]
   WARN Cannot open channel to 12 at election address /10.0.0.12:3888
   (org.apache.zookeeper.server.quorum.QuorumCnxManager)
   Jul 13 20:28:30 host12 zookeeper[26293]:
   java.net.SocketTimeoutException: connect timed out
   Jul 13 20:28:30 host12 zookeeper[26293]: #011at
   java.net.PlainSocketImpl.socketConnect(Native Method)
   Jul 13 20:28:30 host12 zookeeper[26293]: #011at
   java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
   Jul 13 20:28:30 host12 zookeeper[26293]: #011at
   
java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
   Jul 13 20:28:30 host12 zookeeper[26293]: #011at
   java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
   Jul 13 20:28:30 host12 zookeeper[26293]: #011at
   java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
   Jul 13 20:28:30 host12 zookeeper[26293]: #011at
   java.net.Socket.connect(Socket.java:589)
   Jul 13 20:28:30 host12 zookeeper[26293]: #011at
   
org.apache.zookeeper.server.quorum.QuorumCnxManager.connectOne(QuorumCnxManager.java:443)
   Jul 13 20:28:30 host12 zookeeper[26293]: #011at
   
org.apache.zookeeper.server.quorum.QuorumCnxManager.connectOne(QuorumCnxManager.java:486)
   Jul 13 20:28:30 host12 zookeeper[26293]: #011at
   
org.apache.zookeeper.server.quorum.QuorumCnxManager.connectAll(QuorumCnxManager.java:514)
   Jul 13 20:28:30 host12 zookeeper[26293]: #011at
   
org.apache.zookeeper.server.quorum.FastLeaderElection.lookForLeader(FastLeaderElection.java:919)
   Jul 13 20:28:30 host12 zookeeper[26293]: #011at
   org.apache.zookeeper.server.quorum.QuorumPeer.run(QuorumPeer.java:1109)
   Jul 13 20:28:35 host12 zookeeper[26293]: [2017-07-13 20:28:35,645]
   WARN Cannot open channel to 13 at election address /10.0.0.13:3888
   (org.apache.zookeeper.server.quorum.QuorumCnxManager)
   Jul 13 20:28:35 host12 zookeeper[26293]:
   java.net.SocketTimeoutException: connect timed out
   Jul 13 20:28:35 host12 zookeeper[26293]: #011at
   java.net.PlainSocketImpl.socketConnect(Native Method)
   Jul 13 20:28:35 host12 zookeeper[26293]: #011at
   java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
   Jul 13 20:28:35 host12 zookeeper[26293]: #011at
   
java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
   Jul 13 20:28:35 host12 zookeeper[26293]: #011at
   java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
   Jul 13 20:28:35 host12 zookeeper[26293]: #011at
   java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
   Jul 13 20:28:35 host12 zookeeper[26293]: #011at
   java.net.Socket.connect(Socket.java:589)
   Jul 13 20:28:35 host12 zookeeper[26293]: #011at
   
org.apache.zookeeper.server.quorum.QuorumCnxManager.connectOne(QuorumCnxManager.java:443)
   Jul 13 20:28:35 host12 zookeeper[26293]: #011at
   
org.apache.zookeeper.server.quorum.QuorumCnxManager.connectOne(QuorumCnxManager.java:486)
   Jul 13 20:28:35 host12 zookeeper[26293]: #011at
   
org.apache.zookeeper.server.quorum.QuorumCnxManager.connectAll(QuorumCnxManager.java:514)
   Jul 13 20:28:35 host12 zookeeper[26293]: #011at
   
org.apache.zookeeper.server.quorum.FastLeaderElection.lookForLeader(FastLeaderElection.java:919)
   Jul 13 20:28:35 host12 zookeeper[26293]: #011at
   org.apache.zookeeper.server.quorum.QuorumPeer.run(QuorumPeer.java:1109)
   Jul 13 20:29:40 host12 zookeeper[26293]: [2017-07-13 20:29:40,649]
   WARN Cannot open channel to 12 at election address /10.0.0.12:3888
   (org.apache.zookeeper.server.quorum.QuorumCnxManager)
   Jul 13 20:29:40 host12 zookeeper[26293]:
   java.net.SocketTimeoutException: connect timed out
   Jul 13 20:29:40 host12 zookeeper[26293]: #011at
   java.net.PlainSocketImpl.socketConnect(Native Method)
   Jul 13 20:29:40 host12 zookeeper[26293]: #011at
   java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
   Jul 13 20:29:40 host12 zookeeper[26293]: #011at
   
java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
   Jul 13 20:29:40 host12 zookeeper[26293]: #011at
   java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
   Jul 13 20:29:40 host12 zookeeper[26293]: #011at
   java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
   Jul 13 20:29:40 host12 zookeeper[26293]: #011at
   java.net.Socket.connect(Socket.java:589)
   Jul 13 20:29:40 host12 zookeeper[26293]: #011at
   
org.apache.zookeeper.server.quorum.QuorumCnxManager.connectOne(QuorumCnxManager.java:443)
   Jul 13 20:29:40 host12 zookeeper[26293]: #011at
   
org.apache.zookeeper.server.quorum.QuorumCnxManager.connectOne(QuorumCnxManager.java:486)
   Jul 13 20:29:40 host12 zookeeper[26293]: #011at
   
org.apache.zookeeper.server.quorum.QuorumCnxManager.connectAll(QuorumCnxManager.java:514)
   Jul 13 20:29:40 host12 zookeeper[26293]: #011at
   
org.apache.zookeeper.server.quorum.FastLeaderElection.lookForLeader(FastLeaderElection.java:919)
   Jul 13 20:29:40 host12 zookeeper[26293]: #011at
   org.apache.zookeeper.server.quorum.QuorumPeer.run(QuorumPeer.java:1109)
   Jul 13 20:29:45 host12 zookeeper[26293]: [2017-07-13 20:29:45,652]
   WARN Cannot open channel to 13 at election address /10.0.0.13:3888
   (org.apache.zookeeper.server.quorum.QuorumCnxManager)
   Jul 13 20:29:45 host12 zookeeper[26293]:
   java.net.SocketTimeoutException: connect timed out
   Jul 13 20:29:45 host12 zookeeper[26293]: #011at
   java.net.PlainSocketImpl.socketConnect(Native Method)
   Jul 13 20:29:45 host12 zookeeper[26293]: #011at
   java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
   Jul 13 20:29:45 host12 zookeeper[26293]: #011at
   
java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
   Jul 13 20:29:45 host12 zookeeper[26293]: #011at
   java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
   Jul 13 20:29:45 host12 zookeeper[26293]: #011at
   java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
   Jul 13 20:29:45 host12 zookeeper[26293]: #011at
   java.net.Socket.connect(Socket.java:589)
   Jul 13 20:29:45 host12 zookeeper[26293]: #011at
   
org.apache.zookeeper.server.quorum.QuorumCnxManager.connectOne(QuorumCnxManager.java:443)
   Jul 13 20:29:45 host12 zookeeper[26293]: #011at
   
org.apache.zookeeper.server.quorum.QuorumCnxManager.connectOne(QuorumCnxManager.java:486)
   Jul 13 20:29:45 host12 zookeeper[26293]: #011at
   
org.apache.zookeeper.server.quorum.QuorumCnxManager.connectAll(QuorumCnxManager.java:514)
   Jul 13 20:29:45 host12 zookeeper[26293]: #011at
   
org.apache.zookeeper.server.quorum.FastLeaderElection.lookForLeader(FastLeaderElection.java:919)
   Jul 13 20:29:45 host12 zookeeper[26293]: #011at
   org.apache.zookeeper.server.quorum.QuorumPeer.run(QuorumPeer.java:1109)
   Jul 13 20:30:50 host12 zookeeper[26293]: [2017-07-13 20:30:50,657]
   WARN Cannot open channel to 12 at election address /10.0.0.12:3888
   (org.apache.zookeeper.server.quorum.QuorumCnxManager)
   Jul 13 20:30:50 host12 zookeeper[26293]:
   java.net.SocketTimeoutException: connect timed out
   Jul 13 20:30:50 host12 zookeeper[26293]: #011at
   java.net.PlainSocketImpl.socketConnect(Native Method)
   Jul 13 20:30:50 host12 zookeeper[26293]: #011at
   java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
   Jul 13 20:30:50 host12 zookeeper[26293]: #011at
   
java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
   Jul 13 20:30:50 host12 zookeeper[26293]: #011at
   java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
   Jul 13 20:30:50 host12 zookeeper[26293]: #011at
   java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
   Jul 13 20:30:50 host12 zookeeper[26293]: #011at
   java.net.Socket.connect(Socket.java:589)
   Jul 13 20:30:50 host12 zookeeper[26293]: #011at
   
org.apache.zookeeper.server.quorum.QuorumCnxManager.connectOne(QuorumCnxManager.java:443)
   Jul 13 20:30:50 host12 zookeeper[26293]: #011at
   
org.apache.zookeeper.server.quorum.QuorumCnxManager.connectOne(QuorumCnxManager.java:486)
   Jul 13 20:30:50 host12 zookeeper[26293]: #011at
   
org.apache.zookeeper.server.quorum.QuorumCnxManager.connectAll(QuorumCnxManager.java:514)
   Jul 13 20:30:50 host12 zookeeper[26293]: #011at
   
org.apache.zookeeper.server.quorum.FastLeaderElection.lookForLeader(FastLeaderElection.java:919)
   Jul 13 20:30:50 host12 zookeeper[26293]: #011at
   org.apache.zookeeper.server.quorum.QuorumPeer.run(QuorumPeer.java:1109)
   Jul 13 20:30:54 host12 zookeeper[26293]: [2017-07-13 20:30:54,880]
   WARN Unexpected exception, tries=0, remaining init limit=6000,
   connecting to /10.0.0.12:2888
   (org.apache.zookeeper.server.quorum.Learner)
   Jul 13 20:30:54 host12 zookeeper[26293]:
   java.net.SocketTimeoutException: connect timed out
   Jul 13 20:30:54 host12 zookeeper[26293]: #011at
   java.net.PlainSocketImpl.socketConnect(Native Method)
   Jul 13 20:30:54 host12 zookeeper[26293]: #011at
   java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
   Jul 13 20:30:54 host12 zookeeper[26293]: #011at
   
java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
   Jul 13 20:30:54 host12 zookeeper[26293]: #011at
   java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
   Jul 13 20:30:54 host12 zookeeper[26293]: #011at
   java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
   Jul 13 20:30:54 host12 zookeeper[26293]: #011at
   java.net.Socket.connect(Socket.java:589)
   Jul 13 20:30:54 host12 zookeeper[26293]: #011at
   org.apache.zookeeper.server.quorum.Learner.sockConnect(Learner.java:227)
   Jul 13 20:30:54 host12 zookeeper[26293]: #011at
   org.apache.zookeeper.server.quorum.Learner.connectToLeader(Learner.java:256)
   Jul 13 20:30:54 host12 zookeeper[26293]: #011at
   org.apache.zookeeper.server.quorum.Follower.followLeader(Follower.java:76)
   Jul 13 20:30:54 host12 zookeeper[26293]: #011at
   org.apache.zookeeper.server.quorum.QuorumPeer.run(QuorumPeer.java:1133)
   Jul 13 21:00:00 host12 zookeeper[26293]: [2017-07-13 21:00:00,522]
   WARN Got zxid 0x200007d99 expected 0x1
   (org.apache.zookeeper.server.quorum.Learner)
   Jul 14 05:50:05 host12 zookeeper[26293]: [2017-07-14 05:50:05,509]
   WARN Unable to read additional data from client sessionid
   0xc00bee319ed0001, likely client has closed socket
   (org.apache.zookeeper.server.NIOServerCnxn)

As we are using docker, I was wondering if theres someone else having the same issues, or if there's a timeout setting (or anything else) we could set to improve our zookeeper ensemble stability.

Thanks


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