Nothing particular in that dump, and I'm not aware of any deadlock in
0.20.3, could we see the region server log?

Thx

J-D

On Thu, Jul 15, 2010 at 4:17 PM, Luke Forehand
<[email protected]> wrote:
> First post evar!
>
> I have a 3 node cluster and have set mapred.tasktracker.map.tasks.maximum=4.  
> I am using Cloudera's CDH2 dist (hadoop 0.20.1 and hbase 0.20.3).  I am 
> importing a 15GB sequence file into an HTable instance straight from the 
> Mapper, no reduce phase.  At random times during the job, the RegionServer 
> JVMs start to completely hang.  I started up jstatd on the servers and used 
> VisualVM to profile the processes.  When I encounter the hang, I notice 
> absolutely no problems with heap or garbage collection, the region servers 
> just become vegetables within minutes of eachother.  This fact, along with 
> the randomness of the hang, leads me to believe there is a dead lock due to a 
> race condition somewhere in the code.  I suspect something similar to the 
> following issues:
>
> http://issues.apache.org/jira/browse/HADOOP-5859
> http://issues.apache.org/jira/browse/HBASE-667
>
> Here is a thread dump of one of the region server procs immediately after it 
> went silent.  Would anybody that has more knowledge about the inner workings 
> of hadoop/hbase IO have the time to help me confirm that this is the issue I 
> am experiencing?
>
> 2010-07-15 16:33:26
> Full thread dump Java HotSpot(TM) 64-Bit Server VM (14.2-b01 mixed mode):
>
> "RMI TCP Connection(73)-192.168.100.113" - Thread t...@62011
>   java.lang.Thread.State: TIMED_WAITING on 
> com.sun.jmx.remote.internal.arraynotificationbuf...@bd5192
>    at java.lang.Object.wait(Native Method)
>    at 
> com.sun.jmx.remote.internal.ArrayNotificationBuffer.fetchNotifications(ArrayNotificationBuffer.java:417)
>    at 
> com.sun.jmx.remote.internal.ArrayNotificationBuffer$ShareBuffer.fetchNotifications(ArrayNotificationBuffer.java:209)
>    at 
> com.sun.jmx.remote.internal.ServerNotifForwarder.fetchNotifs(ServerNotifForwarder.java:258)
>    at 
> javax.management.remote.rmi.RMIConnectionImpl$2.run(RMIConnectionImpl.java:1227)
>    at 
> javax.management.remote.rmi.RMIConnectionImpl$2.run(RMIConnectionImpl.java:1225)
>    at 
> javax.management.remote.rmi.RMIConnectionImpl.fetchNotifications(RMIConnectionImpl.java:1231)
>    at sun.reflect.GeneratedMethodAccessor61.invoke(Unknown Source)
>    at 
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
>    at java.lang.reflect.Method.invoke(Method.java:597)
>    at sun.rmi.server.UnicastServerRef.dispatch(UnicastServerRef.java:305)
>    at sun.rmi.transport.Transport$1.run(Transport.java:159)
>    at java.security.AccessController.doPrivileged(Native Method)
>    at sun.rmi.transport.Transport.serviceCall(Transport.java:155)
>    at sun.rmi.transport.tcp.TCPTransport.handleMessages(TCPTransport.java:535)
>    at 
> sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run0(TCPTransport.java:790)
>    at 
> sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(TCPTransport.java:649)
>    at 
> java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
>    at 
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
>    at java.lang.Thread.run(Thread.java:619)
>
>   Locked ownable synchronizers:
>    - locked java.util.concurrent.locks.reentrantlock$nonfairs...@40aa3008
>
> "RMI TCP Connection(72)-192.168.100.113" - Thread t...@62010
>   java.lang.Thread.State: RUNNABLE
>    at java.net.SocketInputStream.socketRead0(Native Method)
>    at java.net.SocketInputStream.read(SocketInputStream.java:129)
>    at java.io.BufferedInputStream.fill(BufferedInputStream.java:218)
>    at java.io.BufferedInputStream.read(BufferedInputStream.java:237)
>    - locked java.io.bufferedinputstr...@72bda36f
>    at java.io.FilterInputStream.read(FilterInputStream.java:66)
>    at sun.rmi.transport.tcp.TCPTransport.handleMessages(TCPTransport.java:517)
>    at 
> sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run0(TCPTransport.java:790)
>    at 
> sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(TCPTransport.java:649)
>    at 
> java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
>    at 
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
>    at java.lang.Thread.run(Thread.java:619)
>
>   Locked ownable synchronizers:
>    - locked java.util.concurrent.locks.reentrantlock$nonfairs...@350743
>
> "JMX server connection timeout 62009" - Thread t...@62009
>   java.lang.Thread.State: TIMED_WAITING on [...@5eebd2c6
>    at java.lang.Object.wait(Native Method)
>    at 
> com.sun.jmx.remote.internal.ServerCommunicatorAdmin$Timeout.run(ServerCommunicatorAdmin.java:150)
>    at java.lang.Thread.run(Thread.java:619)
>
>   Locked ownable synchronizers:
>    - None
>
> "ResponseProcessor for block blk_1926230463847049982_2694658" - Thread 
> t...@61160
>   java.lang.Thread.State: RUNNABLE
>    at sun.nio.ch.EPollArrayWrapper.epollWait(Native Method)
>    at sun.nio.ch.EPollArrayWrapper.poll(EPollArrayWrapper.java:215)
>    at sun.nio.ch.EPollSelectorImpl.doSelect(EPollSelectorImpl.java:65)
>    at sun.nio.ch.SelectorImpl.lockAndDoSelect(SelectorImpl.java:69)
>    - locked sun.nio.ch.uti...@196fbfd0
>    - locked java.util.collections$unmodifiable...@7799fdbb
>    - locked sun.nio.ch.epollselectori...@1ee13d55
>    at sun.nio.ch.SelectorImpl.select(SelectorImpl.java:80)
>    at 
> org.apache.hadoop.net.SocketIOWithTimeout$SelectorPool.select(SocketIOWithTimeout.java:332)
>    at 
> org.apache.hadoop.net.SocketIOWithTimeout.doIO(SocketIOWithTimeout.java:157)
>    at org.apache.hadoop.net.SocketInputStream.read(SocketInputStream.java:155)
>    at org.apache.hadoop.net.SocketInputStream.read(SocketInputStream.java:128)
>    at java.io.DataInputStream.readFully(DataInputStream.java:178)
>    at java.io.DataInputStream.readLong(DataInputStream.java:399)
>    at 
> org.apache.hadoop.hdfs.DFSClient$DFSOutputStream$ResponseProcessor.run(DFSClient.java:2399)
>
>   Locked ownable synchronizers:
>    - None
>
> "DataStreamer for file 
> /hbase/.logs/dn01.colo.networkedinsights.com,60020,1279222293084/hlog.dat.1279228611023
>  block blk_1926230463847049982_2694658" - Thread t...@61158
>   java.lang.Thread.State: TIMED_WAITING on java.util.linkedl...@475b455c
>    at java.lang.Object.wait(Native Method)
>    at 
> org.apache.hadoop.hdfs.DFSClient$DFSOutputStream$DataStreamer.run(DFSClient.java:2247)
>
>   Locked ownable synchronizers:
>    - None
>
> "RMI TCP Connection(71)-192.168.100.113" - Thread t...@53904
>   java.lang.Thread.State: RUNNABLE
>    at sun.management.ThreadImpl.dumpThreads0(Native Method)
>    at sun.management.ThreadImpl.dumpAllThreads(ThreadImpl.java:374)
>    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
>    at 
> sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
>    at 
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
>    at java.lang.reflect.Method.invoke(Method.java:597)
>    at 
> com.sun.jmx.mbeanserver.ConvertingMethod.invokeWithOpenReturn(ConvertingMethod.java:167)
>    at 
> com.sun.jmx.mbeanserver.MXBeanIntrospector.invokeM2(MXBeanIntrospector.java:96)
>    at 
> com.sun.jmx.mbeanserver.MXBeanIntrospector.invokeM2(MXBeanIntrospector.java:33)
>    at 
> com.sun.jmx.mbeanserver.MBeanIntrospector.invokeM(MBeanIntrospector.java:208)
>    at com.sun.jmx.mbeanserver.PerInterface.invoke(PerInterface.java:120)
>    at com.sun.jmx.mbeanserver.MBeanSupport.invoke(MBeanSupport.java:262)
>    at javax.management.StandardMBean.invoke(StandardMBean.java:391)
>    at 
> com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.invoke(DefaultMBeanServerInterceptor.java:836)
>    at com.sun.jmx.mbeanserver.JmxMBeanServer.invoke(JmxMBeanServer.java:761)
>    at 
> javax.management.remote.rmi.RMIConnectionImpl.doOperation(RMIConnectionImpl.java:1426)
>    at 
> javax.management.remote.rmi.RMIConnectionImpl.access$200(RMIConnectionImpl.java:72)
>    at 
> javax.management.remote.rmi.RMIConnectionImpl$PrivilegedOperation.run(RMIConnectionImpl.java:1264)
>    at 
> javax.management.remote.rmi.RMIConnectionImpl.doPrivilegedOperation(RMIConnectionImpl.java:1359)
>    at 
> javax.management.remote.rmi.RMIConnectionImpl.invoke(RMIConnectionImpl.java:788)
>    at sun.reflect.GeneratedMethodAccessor59.invoke(Unknown Source)
>    at 
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
>    at java.lang.reflect.Method.invoke(Method.java:597)
>    at sun.rmi.server.UnicastServerRef.dispatch(UnicastServerRef.java:305)
>    at sun.rmi.transport.Transport$1.run(Transport.java:159)
>    at java.security.AccessController.doPrivileged(Native Method)
>    at sun.rmi.transport.Transport.serviceCall(Transport.java:155)
>    at sun.rmi.transport.tcp.TCPTransport.handleMessages(TCPTransport.java:535)
>    at 
> sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run0(TCPTransport.java:790)
>    at 
> sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(TCPTransport.java:649)
>    at 
> java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
>    at 
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
>    at java.lang.Thread.run(Thread.java:619)
>
>   Locked ownable synchronizers:
>    - locked java.util.concurrent.locks.reentrantlock$nonfairs...@5581a749
>
> "JMX server connection timeout 28949" - Thread t...@28949
>   java.lang.Thread.State: TIMED_WAITING on [...@1c6e538d
>    at java.lang.Object.wait(Native Method)
>    at 
> com.sun.jmx.remote.internal.ServerCommunicatorAdmin$Timeout.run(ServerCommunicatorAdmin.java:150)
>    at java.lang.Thread.run(Thread.java:619)
>
>   Locked ownable synchronizers:
>    - None
>
> "RMI TCP Connection(70)-192.168.100.113" - Thread t...@28947
>   java.lang.Thread.State: RUNNABLE
>    at java.net.SocketInputStream.socketRead0(Native Method)
>    at java.net.SocketInputStream.read(SocketInputStream.java:129)
>    at java.io.BufferedInputStream.fill(BufferedInputStream.java:218)
>    at java.io.BufferedInputStream.read(BufferedInputStream.java:237)
>    - locked java.io.bufferedinputstr...@513a56c5
>    at java.io.FilterInputStream.read(FilterInputStream.java:66)
>    at sun.rmi.transport.tcp.TCPTransport.handleMessages(TCPTransport.java:517)
>    at 
> sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run0(TCPTransport.java:790)
>    at 
> sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(TCPTransport.java:649)
>    at 
> java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
>    at 
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
>    at java.lang.Thread.run(Thread.java:619)
>
>   Locked ownable synchronizers:
>    - locked java.util.concurrent.locks.reentrantlock$nonfairs...@4d16c92c
>
> "regionserver/192.168.200.31:60020.compactor-EventThread" - Thread t...@19245
>   java.lang.Thread.State: WAITING on 
> java.util.concurrent.locks.abstractqueuedsynchronizer$conditionobj...@35c7b446
>    at sun.misc.Unsafe.park(Native Method)
>    at java.util.concurrent.locks.LockSupport.park(LockSupport.java:158)
>    at 
> java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:1925)
>    at 
> java.util.concurrent.LinkedBlockingQueue.take(LinkedBlockingQueue.java:358)
>    at org.apache.zookeeper.ClientCnxn$EventThread.run(ClientCnxn.java:414)
>
>   Locked ownable synchronizers:
>    - None
>
> "regionserver/192.168.200.31:60020.compactor-SendThread" - Thread t...@19244
>   java.lang.Thread.State: RUNNABLE
>    at sun.nio.ch.EPollArrayWrapper.epollWait(Native Method)
>    at sun.nio.ch.EPollArrayWrapper.poll(EPollArrayWrapper.java:215)
>    at sun.nio.ch.EPollSelectorImpl.doSelect(EPollSelectorImpl.java:65)
>    at sun.nio.ch.SelectorImpl.lockAndDoSelect(SelectorImpl.java:69)
>    - locked sun.nio.ch.uti...@30f33929
>    - locked java.util.collections$unmodifiable...@ea26dec
>    - locked sun.nio.ch.epollselectori...@3905bf36
>    at sun.nio.ch.SelectorImpl.select(SelectorImpl.java:80)
>    at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:921)
>
>   Locked ownable synchronizers:
>    - None
>
> "RMI Scheduler(0)" - Thread t...@406
>   java.lang.Thread.State: TIMED_WAITING on 
> java.util.concurrent.locks.abstractqueuedsynchronizer$conditionobj...@66d9c57f
>    at sun.misc.Unsafe.park(Native Method)
>    at java.util.concurrent.locks.LockSupport.parkNanos(LockSupport.java:198)
>    at 
> java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.awaitNanos(AbstractQueuedSynchronizer.java:1963)
>    at java.util.concurrent.DelayQueue.take(DelayQueue.java:164)
>    at 
> java.util.concurrent.ScheduledThreadPoolExecutor$DelayedWorkQueue.take(ScheduledThreadPoolExecutor.java:583)
>    at 
> java.util.concurrent.ScheduledThreadPoolExecutor$DelayedWorkQueue.take(ScheduledThreadPoolExecutor.java:576)
>    at 
> java.util.concurrent.ThreadPoolExecutor.getTask(ThreadPoolExecutor.java:947)
>    at 
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:907)
>    at java.lang.Thread.run(Thread.java:619)
>
>   Locked ownable synchronizers:
>    - None
>
> "pool-1-thread-1" - Thread t...@74
>   java.lang.Thread.State: TIMED_WAITING on 
> java.util.concurrent.locks.abstractqueuedsynchronizer$conditionobj...@3175e1a2
>    at sun.misc.Unsafe.park(Native Method)
>    at java.util.concurrent.locks.LockSupport.parkNanos(LockSupport.java:198)
>    at 
> java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.awaitNanos(AbstractQueuedSynchronizer.java:1963)
>    at java.util.concurrent.DelayQueue.take(DelayQueue.java:164)
>    at 
> java.util.concurrent.ScheduledThreadPoolExecutor$DelayedWorkQueue.take(ScheduledThreadPoolExecutor.java:583)
>    at 
> java.util.concurrent.ScheduledThreadPoolExecutor$DelayedWorkQueue.take(ScheduledThreadPoolExecutor.java:576)
>    at 
> java.util.concurrent.ThreadPoolExecutor.getTask(ThreadPoolExecutor.java:947)
>    at 
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:907)
>    at java.lang.Thread.run(Thread.java:619)
>
>   Locked ownable synchronizers:
>    - None
>
> "LruBlockCache.EvictionThread" - Thread t...@72
>   java.lang.Thread.State: WAITING on 
> org.apache.hadoop.hbase.io.hfile.lrublockcache$evictionthr...@32306c0c
>    at java.lang.Object.wait(Native Method)
>    at java.lang.Object.wait(Object.java:485)
>    at 
> org.apache.hadoop.hbase.io.hfile.LruBlockCache$EvictionThread.run(LruBlockCache.java:512)
>
>   Locked ownable synchronizers:
>    - None
>
> "IPC Server handler 24 on 60020" - Thread t...@71
>   java.lang.Thread.State: WAITING on 
> java.util.concurrent.locks.abstractqueuedsynchronizer$conditionobj...@905a192
>    at sun.misc.Unsafe.park(Native Method)
>    at java.util.concurrent.locks.LockSupport.park(LockSupport.java:158)
>    at 
> java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:1925)
>    at 
> java.util.concurrent.LinkedBlockingQueue.take(LinkedBlockingQueue.java:358)
>    at 
> org.apache.hadoop.hbase.ipc.HBaseServer$Handler.run(HBaseServer.java:901)
>
>   Locked ownable synchronizers:
>    - None
>
> "IPC Server handler 23 on 60020" - Thread t...@70
>   java.lang.Thread.State: WAITING on 
> java.util.concurrent.locks.abstractqueuedsynchronizer$conditionobj...@905a192
>    at sun.misc.Unsafe.park(Native Method)
>    at java.util.concurrent.locks.LockSupport.park(LockSupport.java:158)
>    at 
> java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:1925)
>    at 
> java.util.concurrent.LinkedBlockingQueue.take(LinkedBlockingQueue.java:358)
>    at 
> org.apache.hadoop.hbase.ipc.HBaseServer$Handler.run(HBaseServer.java:901)
>
>   Locked ownable synchronizers:
>    - None
>
> "IPC Server handler 22 on 60020" - Thread t...@69
>   java.lang.Thread.State: WAITING on 
> java.util.concurrent.locks.abstractqueuedsynchronizer$conditionobj...@905a192
>    at sun.misc.Unsafe.park(Native Method)
>    at java.util.concurrent.locks.LockSupport.park(LockSupport.java:158)
>    at 
> java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:1925)
>    at 
> java.util.concurrent.LinkedBlockingQueue.take(LinkedBlockingQueue.java:358)
>    at 
> org.apache.hadoop.hbase.ipc.HBaseServer$Handler.run(HBaseServer.java:901)
>
>   Locked ownable synchronizers:
>    - None
>
> "IPC Server handler 21 on 60020" - Thread t...@68
>   java.lang.Thread.State: WAITING on 
> java.util.concurrent.locks.abstractqueuedsynchronizer$conditionobj...@905a192
>    at sun.misc.Unsafe.park(Native Method)
>    at java.util.concurrent.locks.LockSupport.park(LockSupport.java:158)
>    at 
> java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:1925)
>    at 
> java.util.concurrent.LinkedBlockingQueue.take(LinkedBlockingQueue.java:358)
>    at 
> org.apache.hadoop.hbase.ipc.HBaseServer$Handler.run(HBaseServer.java:901)
>
>   Locked ownable synchronizers:
>    - None
>
> "IPC Server handler 20 on 60020" - Thread t...@67
>   java.lang.Thread.State: WAITING on 
> java.util.concurrent.locks.abstractqueuedsynchronizer$conditionobj...@905a192
>    at sun.misc.Unsafe.park(Native Method)
>    at java.util.concurrent.locks.LockSupport.park(LockSupport.java:158)
>    at 
> java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:1925)
>    at 
> java.util.concurrent.LinkedBlockingQueue.take(LinkedBlockingQueue.java:358)
>    at 
> org.apache.hadoop.hbase.ipc.HBaseServer$Handler.run(HBaseServer.java:901)
>
>   Locked ownable synchronizers:
>    - None
>
> "IPC Server handler 19 on 60020" - Thread t...@66
>   java.lang.Thread.State: WAITING on 
> java.util.concurrent.locks.abstractqueuedsynchronizer$conditionobj...@905a192
>    at sun.misc.Unsafe.park(Native Method)
>    at java.util.concurrent.locks.LockSupport.park(LockSupport.java:158)
>    at 
> java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:1925)
>    at 
> java.util.concurrent.LinkedBlockingQueue.take(LinkedBlockingQueue.java:358)
>    at 
> org.apache.hadoop.hbase.ipc.HBaseServer$Handler.run(HBaseServer.java:901)
>
>   Locked ownable synchronizers:
>    - None
>
> "IPC Server handler 18 on 60020" - Thread t...@65
>   java.lang.Thread.State: WAITING on 
> java.util.concurrent.locks.abstractqueuedsynchronizer$conditionobj...@905a192
>    at sun.misc.Unsafe.park(Native Method)
>    at java.util.concurrent.locks.LockSupport.park(LockSupport.java:158)
>    at 
> java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:1925)
>    at 
> java.util.concurrent.LinkedBlockingQueue.take(LinkedBlockingQueue.java:358)
>    at 
> org.apache.hadoop.hbase.ipc.HBaseServer$Handler.run(HBaseServer.java:901)
>
>   Locked ownable synchronizers:
>    - None
>
> "IPC Server handler 17 on 60020" - Thread t...@64
>   java.lang.Thread.State: WAITING on 
> java.util.concurrent.locks.abstractqueuedsynchronizer$conditionobj...@905a192
>    at sun.misc.Unsafe.park(Native Method)
>    at java.util.concurrent.locks.LockSupport.park(LockSupport.java:158)
>    at 
> java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:1925)
>    at 
> java.util.concurrent.LinkedBlockingQueue.take(LinkedBlockingQueue.java:358)
>    at 
> org.apache.hadoop.hbase.ipc.HBaseServer$Handler.run(HBaseServer.java:901)
>
>   Locked ownable synchronizers:
>    - None
>
> "IPC Server handler 16 on 60020" - Thread t...@63
>   java.lang.Thread.State: WAITING on 
> java.util.concurrent.locks.abstractqueuedsynchronizer$conditionobj...@905a192
>    at sun.misc.Unsafe.park(Native Method)
>    at java.util.concurrent.locks.LockSupport.park(LockSupport.java:158)
>    at 
> java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:1925)
>    at 
> java.util.concurrent.LinkedBlockingQueue.take(LinkedBlockingQueue.java:358)
>    at 
> org.apache.hadoop.hbase.ipc.HBaseServer$Handler.run(HBaseServer.java:901)
>
>   Locked ownable synchronizers:
>    - None
>
> "IPC Server handler 15 on 60020" - Thread t...@62
>   java.lang.Thread.State: WAITING on 
> java.util.concurrent.locks.abstractqueuedsynchronizer$conditionobj...@905a192
>    at sun.misc.Unsafe.park(Native Method)
>    at java.util.concurrent.locks.LockSupport.park(LockSupport.java:158)
>    at 
> java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:1925)
>    at 
> java.util.concurrent.LinkedBlockingQueue.take(LinkedBlockingQueue.java:358)
>    at 
> org.apache.hadoop.hbase.ipc.HBaseServer$Handler.run(HBaseServer.java:901)
>
>   Locked ownable synchronizers:
>    - None
>
> "IPC Server handler 14 on 60020" - Thread t...@61
>   java.lang.Thread.State: WAITING on 
> java.util.concurrent.locks.abstractqueuedsynchronizer$conditionobj...@905a192
>    at sun.misc.Unsafe.park(Native Method)
>    at java.util.concurrent.locks.LockSupport.park(LockSupport.java:158)
>    at 
> java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:1925)
>    at 
> java.util.concurrent.LinkedBlockingQueue.take(LinkedBlockingQueue.java:358)
>    at 
> org.apache.hadoop.hbase.ipc.HBaseServer$Handler.run(HBaseServer.java:901)
>
>   Locked ownable synchronizers:
>    - None
>
> "IPC Server handler 13 on 60020" - Thread t...@60
>   java.lang.Thread.State: WAITING on 
> java.util.concurrent.locks.abstractqueuedsynchronizer$conditionobj...@905a192
>    at sun.misc.Unsafe.park(Native Method)
>    at java.util.concurrent.locks.LockSupport.park(LockSupport.java:158)
>    at 
> java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:1925)
>    at 
> java.util.concurrent.LinkedBlockingQueue.take(LinkedBlockingQueue.java:358)
>    at 
> org.apache.hadoop.hbase.ipc.HBaseServer$Handler.run(HBaseServer.java:901)
>
>   Locked ownable synchronizers:
>    - None
>
> "IPC Server handler 12 on 60020" - Thread t...@59
>   java.lang.Thread.State: WAITING on 
> java.util.concurrent.locks.abstractqueuedsynchronizer$conditionobj...@905a192
>    at sun.misc.Unsafe.park(Native Method)
>    at java.util.concurrent.locks.LockSupport.park(LockSupport.java:158)
>    at 
> java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:1925)
>    at 
> java.util.concurrent.LinkedBlockingQueue.take(LinkedBlockingQueue.java:358)
>    at 
> org.apache.hadoop.hbase.ipc.HBaseServer$Handler.run(HBaseServer.java:901)
>
>   Locked ownable synchronizers:
>    - None
>
> "IPC Server handler 11 on 60020" - Thread t...@58
>   java.lang.Thread.State: WAITING on 
> java.util.concurrent.locks.abstractqueuedsynchronizer$conditionobj...@905a192
>    at sun.misc.Unsafe.park(Native Method)
>    at java.util.concurrent.locks.LockSupport.park(LockSupport.java:158)
>    at 
> java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:1925)
>    at 
> java.util.concurrent.LinkedBlockingQueue.take(LinkedBlockingQueue.java:358)
>    at 
> org.apache.hadoop.hbase.ipc.HBaseServer$Handler.run(HBaseServer.java:901)
>
>   Locked ownable synchronizers:
>    - None
>
> "IPC Server handler 10 on 60020" - Thread t...@57
>   java.lang.Thread.State: WAITING on 
> java.util.concurrent.locks.abstractqueuedsynchronizer$conditionobj...@905a192
>    at sun.misc.Unsafe.park(Native Method)
>    at java.util.concurrent.locks.LockSupport.park(LockSupport.java:158)
>    at 
> java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:1925)
>    at 
> java.util.concurrent.LinkedBlockingQueue.take(LinkedBlockingQueue.java:358)
>    at 
> org.apache.hadoop.hbase.ipc.HBaseServer$Handler.run(HBaseServer.java:901)
>
>   Locked ownable synchronizers:
>    - None
>
> "IPC Server handler 9 on 60020" - Thread t...@56
>   java.lang.Thread.State: WAITING on 
> java.util.concurrent.locks.abstractqueuedsynchronizer$conditionobj...@905a192
>    at sun.misc.Unsafe.park(Native Method)
>    at java.util.concurrent.locks.LockSupport.park(LockSupport.java:158)
>    at 
> java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:1925)
>    at 
> java.util.concurrent.LinkedBlockingQueue.take(LinkedBlockingQueue.java:358)
>    at 
> org.apache.hadoop.hbase.ipc.HBaseServer$Handler.run(HBaseServer.java:901)
>
>   Locked ownable synchronizers:
>    - None
>
> "IPC Server handler 8 on 60020" - Thread t...@55
>   java.lang.Thread.State: WAITING on 
> java.util.concurrent.locks.abstractqueuedsynchronizer$conditionobj...@905a192
>    at sun.misc.Unsafe.park(Native Method)
>    at java.util.concurrent.locks.LockSupport.park(LockSupport.java:158)
>    at 
> java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:1925)
>    at 
> java.util.concurrent.LinkedBlockingQueue.take(LinkedBlockingQueue.java:358)
>    at 
> org.apache.hadoop.hbase.ipc.HBaseServer$Handler.run(HBaseServer.java:901)
>
>   Locked ownable synchronizers:
>    - None
>
> "IPC Server handler 7 on 60020" - Thread t...@54
>   java.lang.Thread.State: WAITING on 
> java.util.concurrent.locks.abstractqueuedsynchronizer$conditionobj...@905a192
>    at sun.misc.Unsafe.park(Native Method)
>    at java.util.concurrent.locks.LockSupport.park(LockSupport.java:158)
>    at 
> java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:1925)
>    at 
> java.util.concurrent.LinkedBlockingQueue.take(LinkedBlockingQueue.java:358)
>    at 
> org.apache.hadoop.hbase.ipc.HBaseServer$Handler.run(HBaseServer.java:901)
>
>   Locked ownable synchronizers:
>    - None
>
> "IPC Server handler 6 on 60020" - Thread t...@53
>   java.lang.Thread.State: WAITING on 
> java.util.concurrent.locks.abstractqueuedsynchronizer$conditionobj...@905a192
>    at sun.misc.Unsafe.park(Native Method)
>    at java.util.concurrent.locks.LockSupport.park(LockSupport.java:158)
>    at 
> java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:1925)
>    at 
> java.util.concurrent.LinkedBlockingQueue.take(LinkedBlockingQueue.java:358)
>    at 
> org.apache.hadoop.hbase.ipc.HBaseServer$Handler.run(HBaseServer.java:901)
>
>   Locked ownable synchronizers:
>    - None
>
> "IPC Server handler 5 on 60020" - Thread t...@52
>   java.lang.Thread.State: WAITING on 
> java.util.concurrent.locks.abstractqueuedsynchronizer$conditionobj...@905a192
>    at sun.misc.Unsafe.park(Native Method)
>    at java.util.concurrent.locks.LockSupport.park(LockSupport.java:158)
>    at 
> java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:1925)
>    at 
> java.util.concurrent.LinkedBlockingQueue.take(LinkedBlockingQueue.java:358)
>    at 
> org.apache.hadoop.hbase.ipc.HBaseServer$Handler.run(HBaseServer.java:901)
>
>   Locked ownable synchronizers:
>    - None
>
> "IPC Server handler 4 on 60020" - Thread t...@51
>   java.lang.Thread.State: WAITING on 
> java.util.concurrent.locks.abstractqueuedsynchronizer$conditionobj...@905a192
>    at sun.misc.Unsafe.park(Native Method)
>    at java.util.concurrent.locks.LockSupport.park(LockSupport.java:158)
>    at 
> java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:1925)
>    at 
> java.util.concurrent.LinkedBlockingQueue.take(LinkedBlockingQueue.java:358)
>    at 
> org.apache.hadoop.hbase.ipc.HBaseServer$Handler.run(HBaseServer.java:901)
>
>   Locked ownable synchronizers:
>    - None
>
> "IPC Server handler 3 on 60020" - Thread t...@50
>   java.lang.Thread.State: WAITING on 
> java.util.concurrent.locks.abstractqueuedsynchronizer$conditionobj...@905a192
>    at sun.misc.Unsafe.park(Native Method)
>    at java.util.concurrent.locks.LockSupport.park(LockSupport.java:158)
>    at 
> java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:1925)
>    at 
> java.util.concurrent.LinkedBlockingQueue.take(LinkedBlockingQueue.java:358)
>    at 
> org.apache.hadoop.hbase.ipc.HBaseServer$Handler.run(HBaseServer.java:901)
>
>   Locked ownable synchronizers:
>    - None
>
> "IPC Server handler 2 on 60020" - Thread t...@49
>   java.lang.Thread.State: WAITING on 
> java.util.concurrent.locks.abstractqueuedsynchronizer$conditionobj...@905a192
>    at sun.misc.Unsafe.park(Native Method)
>    at java.util.concurrent.locks.LockSupport.park(LockSupport.java:158)
>    at 
> java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:1925)
>    at 
> java.util.concurrent.LinkedBlockingQueue.take(LinkedBlockingQueue.java:358)
>    at 
> org.apache.hadoop.hbase.ipc.HBaseServer$Handler.run(HBaseServer.java:901)
>
>   Locked ownable synchronizers:
>    - None
>
> "IPC Server handler 1 on 60020" - Thread t...@48
>   java.lang.Thread.State: WAITING on 
> java.util.concurrent.locks.abstractqueuedsynchronizer$conditionobj...@905a192
>    at sun.misc.Unsafe.park(Native Method)
>    at java.util.concurrent.locks.LockSupport.park(LockSupport.java:158)
>    at 
> java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:1925)
>    at 
> java.util.concurrent.LinkedBlockingQueue.take(LinkedBlockingQueue.java:358)
>    at 
> org.apache.hadoop.hbase.ipc.HBaseServer$Handler.run(HBaseServer.java:901)
>
>   Locked ownable synchronizers:
>    - None
>
> "IPC Server handler 0 on 60020" - Thread t...@47
>   java.lang.Thread.State: WAITING on 
> java.util.concurrent.locks.abstractqueuedsynchronizer$conditionobj...@905a192
>    at sun.misc.Unsafe.park(Native Method)
>    at java.util.concurrent.locks.LockSupport.park(LockSupport.java:158)
>    at 
> java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:1925)
>    at 
> java.util.concurrent.LinkedBlockingQueue.take(LinkedBlockingQueue.java:358)
>    at 
> org.apache.hadoop.hbase.ipc.HBaseServer$Handler.run(HBaseServer.java:901)
>
>   Locked ownable synchronizers:
>    - None
>
> "IPC Server listener on 60020" - Thread t...@14
>   java.lang.Thread.State: RUNNABLE
>    at sun.nio.ch.EPollArrayWrapper.epollWait(Native Method)
>    at sun.nio.ch.EPollArrayWrapper.poll(EPollArrayWrapper.java:215)
>    at sun.nio.ch.EPollSelectorImpl.doSelect(EPollSelectorImpl.java:65)
>    at sun.nio.ch.SelectorImpl.lockAndDoSelect(SelectorImpl.java:69)
>    - locked sun.nio.ch.uti...@284c8f79
>    - locked java.util.collections$unmodifiable...@3a5f659a
>    - locked sun.nio.ch.epollselectori...@4d077f66
>    at sun.nio.ch.SelectorImpl.select(SelectorImpl.java:80)
>    at sun.nio.ch.SelectorImpl.select(SelectorImpl.java:84)
>    at 
> org.apache.hadoop.hbase.ipc.HBaseServer$Listener.run(HBaseServer.java:308)
>
>   Locked ownable synchronizers:
>    - None
>
> "IPC Server Responder" - Thread t...@16
>   java.lang.Thread.State: RUNNABLE
>    at sun.nio.ch.EPollArrayWrapper.epollWait(Native Method)
>    at sun.nio.ch.EPollArrayWrapper.poll(EPollArrayWrapper.java:215)
>    at sun.nio.ch.EPollSelectorImpl.doSelect(EPollSelectorImpl.java:65)
>    at sun.nio.ch.SelectorImpl.lockAndDoSelect(SelectorImpl.java:69)
>    - locked sun.nio.ch.uti...@273d290c
>    - locked java.util.collections$unmodifiable...@2051e6f4
>    - locked sun.nio.ch.epollselectori...@6111adbf
>    at sun.nio.ch.SelectorImpl.select(SelectorImpl.java:80)
>    at 
> org.apache.hadoop.hbase.ipc.HBaseServer$Responder.run(HBaseServer.java:477)
>
>   Locked ownable synchronizers:
>    - None
>
> "Timer-0" - Thread t...@46
>   java.lang.Thread.State: TIMED_WAITING on java.util.taskqu...@50b27cde
>    at java.lang.Object.wait(Native Method)
>    at java.util.TimerThread.mainLoop(Timer.java:509)
>    at java.util.TimerThread.run(Timer.java:462)
>
>   Locked ownable synchronizers:
>    - None
>
> "889074...@qtp0-1 - Acceptor0 [email protected]:60030" - Thread 
> t...@45
>   java.lang.Thread.State: RUNNABLE
>    at sun.nio.ch.EPollArrayWrapper.epollWait(Native Method)
>    at sun.nio.ch.EPollArrayWrapper.poll(EPollArrayWrapper.java:215)
>    at sun.nio.ch.EPollSelectorImpl.doSelect(EPollSelectorImpl.java:65)
>    at sun.nio.ch.SelectorImpl.lockAndDoSelect(SelectorImpl.java:69)
>    - locked sun.nio.ch.uti...@1d7082c8
>    - locked java.util.collections$unmodifiable...@b9bc44a
>    - locked sun.nio.ch.epollselectori...@6f7f73f7
>    at sun.nio.ch.SelectorImpl.select(SelectorImpl.java:80)
>    at 
> org.mortbay.io.nio.SelectorManager$SelectSet.doSelect(SelectorManager.java:429)
>    at org.mortbay.io.nio.SelectorManager.doSelect(SelectorManager.java:185)
>    at 
> org.mortbay.jetty.nio.SelectChannelConnector.accept(SelectChannelConnector.java:124)
>    at 
> org.mortbay.jetty.AbstractConnector$Acceptor.run(AbstractConnector.java:707)
>    at 
> org.mortbay.thread.QueuedThreadPool$PoolThread.run(QueuedThreadPool.java:522)
>
>   Locked ownable synchronizers:
>    - None
>
> "1374821...@qtp0-0" - Thread t...@44
>   java.lang.Thread.State: TIMED_WAITING on 
> org.mortbay.thread.queuedthreadpool$poolthr...@51f21c50
>    at java.lang.Object.wait(Native Method)
>    at 
> org.mortbay.thread.QueuedThreadPool$PoolThread.run(QueuedThreadPool.java:565)
>
>   Locked ownable synchronizers:
>    - None
>
> "regionserver/192.168.200.31:60020.leaseChecker" - Thread t...@23
>   java.lang.Thread.State: TIMED_WAITING on 
> java.util.concurrent.locks.abstractqueuedsynchronizer$conditionobj...@7623fc35
>    at sun.misc.Unsafe.park(Native Method)
>    at java.util.concurrent.locks.LockSupport.parkNanos(LockSupport.java:198)
>    at 
> java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.awaitNanos(AbstractQueuedSynchronizer.java:1963)
>    at java.util.concurrent.DelayQueue.poll(DelayQueue.java:201)
>    at org.apache.hadoop.hbase.Leases.run(Leases.java:81)
>
>   Locked ownable synchronizers:
>    - None
>
> "regionserver/192.168.200.31:60020.majorCompactionChecker" - Thread t...@22
>   java.lang.Thread.State: TIMED_WAITING
>    at java.lang.Thread.sleep(Native Method)
>    at org.apache.hadoop.hbase.util.Sleeper.sleep(Sleeper.java:74)
>    at org.apache.hadoop.hbase.Chore.run(Chore.java:76)
>
>   Locked ownable synchronizers:
>    - None
>
> "regionserver/192.168.200.31:60020.worker" - Thread t...@17
>   java.lang.Thread.State: TIMED_WAITING on 
> java.util.concurrent.locks.abstractqueuedsynchronizer$conditionobj...@3483382b
>    at sun.misc.Unsafe.park(Native Method)
>    at java.util.concurrent.locks.LockSupport.parkNanos(LockSupport.java:198)
>    at 
> java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.awaitNanos(AbstractQueuedSynchronizer.java:1963)
>    at 
> java.util.concurrent.LinkedBlockingQueue.poll(LinkedBlockingQueue.java:395)
>    at 
> org.apache.hadoop.hbase.regionserver.HRegionServer$Worker.run(HRegionServer.java:1425)
>    at java.lang.Thread.run(Thread.java:619)
>
>   Locked ownable synchronizers:
>    - None
>
> "regionserver/192.168.200.31:60020.compactor" - Thread t...@19
>   java.lang.Thread.State: TIMED_WAITING on 
> java.util.concurrent.locks.abstractqueuedsynchronizer$conditionobj...@12dca9fc
>    at sun.misc.Unsafe.park(Native Method)
>    at java.util.concurrent.locks.LockSupport.parkNanos(LockSupport.java:198)
>    at 
> java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.awaitNanos(AbstractQueuedSynchronizer.java:1963)
>    at 
> java.util.concurrent.LinkedBlockingQueue.poll(LinkedBlockingQueue.java:395)
>    at 
> org.apache.hadoop.hbase.regionserver.CompactSplitThread.run(CompactSplitThread.java:85)
>
>   Locked ownable synchronizers:
>    - None
>
> "regionserver/192.168.200.31:60020.cacheFlusher" - Thread t...@18
>   java.lang.Thread.State: TIMED_WAITING on 
> java.util.concurrent.locks.abstractqueuedsynchronizer$conditionobj...@551be910
>    at sun.misc.Unsafe.park(Native Method)
>    at java.util.concurrent.locks.LockSupport.parkNanos(LockSupport.java:198)
>    at 
> java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.awaitNanos(AbstractQueuedSynchronizer.java:1963)
>    at 
> java.util.concurrent.LinkedBlockingQueue.poll(LinkedBlockingQueue.java:395)
>    at 
> org.apache.hadoop.hbase.regionserver.MemStoreFlusher.run(MemStoreFlusher.java:145)
>
>   Locked ownable synchronizers:
>    - None
>
> "regionserver/192.168.200.31:60020.logFlusher" - Thread t...@21
>   java.lang.Thread.State: TIMED_WAITING
>    at java.lang.Thread.sleep(Native Method)
>    at org.apache.hadoop.hbase.util.Sleeper.sleep(Sleeper.java:74)
>    at org.apache.hadoop.hbase.Chore.run(Chore.java:76)
>
>   Locked ownable synchronizers:
>    - None
>
> "regionserver/192.168.200.31:60020.logRoller" - Thread t...@20
>   java.lang.Thread.State: TIMED_WAITING on 
> java.util.concurrent.atomic.atomicbool...@1b624517
>    at java.lang.Object.wait(Native Method)
>    at org.apache.hadoop.hbase.regionserver.LogRoller.run(LogRoller.java:65)
>
>   Locked ownable synchronizers:
>    - None
>
> "Timer thread for monitoring jvm" - Thread t...@42
>   java.lang.Thread.State: TIMED_WAITING on java.util.taskqu...@63354999
>    at java.lang.Object.wait(Native Method)
>    at java.util.TimerThread.mainLoop(Timer.java:509)
>    at java.util.TimerThread.run(Timer.java:462)
>
>   Locked ownable synchronizers:
>    - None
>
> "Timer thread for monitoring hbase" - Thread t...@41
>   java.lang.Thread.State: TIMED_WAITING on java.util.taskqu...@4c966553
>    at java.lang.Object.wait(Native Method)
>    at java.util.TimerThread.mainLoop(Timer.java:509)
>    at java.util.TimerThread.run(Timer.java:462)
>
>   Locked ownable synchronizers:
>    - None
>
> "LeaseChecker" - Thread t...@40
>   java.lang.Thread.State: TIMED_WAITING
>    at java.lang.Thread.sleep(Native Method)
>    at org.apache.hadoop.hdfs.DFSClient$LeaseChecker.run(DFSClient.java:1066)
>    at java.lang.Thread.run(Thread.java:619)
>
>   Locked ownable synchronizers:
>    - None
>
> "IPC Client (47) connection to /192.168.200.30:60000 from an unknown user" - 
> Thread t...@28
>   java.lang.Thread.State: TIMED_WAITING on 
> org.apache.hadoop.hbase.ipc.hbaseclient$connect...@3ffe5e31
>    at java.lang.Object.wait(Native Method)
>    at 
> org.apache.hadoop.hbase.ipc.HBaseClient$Connection.waitForWork(HBaseClient.java:404)
>    at 
> org.apache.hadoop.hbase.ipc.HBaseClient$Connection.run(HBaseClient.java:447)
>
>   Locked ownable synchronizers:
>    - None
>
> "DestroyJavaVM" - Thread t...@27
>   java.lang.Thread.State: RUNNABLE
>
>   Locked ownable synchronizers:
>    - None
>
> "regionserver/192.168.200.31:60020" - Thread t...@26
>   java.lang.Thread.State: TIMED_WAITING
>    at java.lang.Thread.sleep(Native Method)
>    at org.apache.hadoop.hbase.util.Sleeper.sleep(Sleeper.java:74)
>    at 
> org.apache.hadoop.hbase.regionserver.HRegionServer.run(HRegionServer.java:594)
>    at java.lang.Thread.run(Thread.java:619)
>
>   Locked ownable synchronizers:
>    - None
>
> "main-EventThread" - Thread t...@25
>   java.lang.Thread.State: WAITING on 
> java.util.concurrent.locks.abstractqueuedsynchronizer$conditionobj...@54da03c9
>    at sun.misc.Unsafe.park(Native Method)
>    at java.util.concurrent.locks.LockSupport.park(LockSupport.java:158)
>    at 
> java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:1925)
>    at 
> java.util.concurrent.LinkedBlockingQueue.take(LinkedBlockingQueue.java:358)
>    at org.apache.zookeeper.ClientCnxn$EventThread.run(ClientCnxn.java:414)
>
>   Locked ownable synchronizers:
>    - None
>
> "main-SendThread" - Thread t...@24
>   java.lang.Thread.State: RUNNABLE
>    at sun.nio.ch.EPollArrayWrapper.epollWait(Native Method)
>    at sun.nio.ch.EPollArrayWrapper.poll(EPollArrayWrapper.java:215)
>    at sun.nio.ch.EPollSelectorImpl.doSelect(EPollSelectorImpl.java:65)
>    at sun.nio.ch.SelectorImpl.lockAndDoSelect(SelectorImpl.java:69)
>    - locked sun.nio.ch.uti...@18969651
>    - locked java.util.collections$unmodifiable...@4666ac73
>    - locked sun.nio.ch.epollselectori...@7ec3d620
>    at sun.nio.ch.SelectorImpl.select(SelectorImpl.java:80)
>    at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:921)
>
>   Locked ownable synchronizers:
>    - None
>
> "Timer thread for monitoring rpc" - Thread t...@15
>   java.lang.Thread.State: TIMED_WAITING on java.util.taskqu...@352eaca4
>    at java.lang.Object.wait(Native Method)
>    at java.util.TimerThread.mainLoop(Timer.java:509)
>    at java.util.TimerThread.run(Timer.java:462)
>
>   Locked ownable synchronizers:
>    - None
>
> "RMI TCP Accept-0" - Thread t...@12
>   java.lang.Thread.State: RUNNABLE
>    at java.net.PlainSocketImpl.socketAccept(Native Method)
>    at java.net.PlainSocketImpl.accept(PlainSocketImpl.java:390)
>    - locked java.net.sockssocketi...@6b1f0fe4
>    at java.net.ServerSocket.implAccept(ServerSocket.java:453)
>    at java.net.ServerSocket.accept(ServerSocket.java:421)
>    at 
> sun.management.jmxremote.LocalRMIServerSocketFactory$1.accept(LocalRMIServerSocketFactory.java:34)
>    at 
> sun.rmi.transport.tcp.TCPTransport$AcceptLoop.executeAcceptLoop(TCPTransport.java:369)
>    at sun.rmi.transport.tcp.TCPTransport$AcceptLoop.run(TCPTransport.java:341)
>    at java.lang.Thread.run(Thread.java:619)
>
>   Locked ownable synchronizers:
>    - None
>
> "RMI TCP Accept-10102" - Thread t...@11
>   java.lang.Thread.State: RUNNABLE
>    at java.net.PlainSocketImpl.socketAccept(Native Method)
>    at java.net.PlainSocketImpl.accept(PlainSocketImpl.java:390)
>    - locked java.net.sockssocketi...@444c78ad
>    at java.net.ServerSocket.implAccept(ServerSocket.java:453)
>    at java.net.ServerSocket.accept(ServerSocket.java:421)
>    at 
> sun.rmi.transport.tcp.TCPTransport$AcceptLoop.executeAcceptLoop(TCPTransport.java:369)
>    at sun.rmi.transport.tcp.TCPTransport$AcceptLoop.run(TCPTransport.java:341)
>    at java.lang.Thread.run(Thread.java:619)
>
>   Locked ownable synchronizers:
>    - None
>
> "RMI TCP Accept-0" - Thread t...@10
>   java.lang.Thread.State: RUNNABLE
>    at java.net.PlainSocketImpl.socketAccept(Native Method)
>    at java.net.PlainSocketImpl.accept(PlainSocketImpl.java:390)
>    - locked java.net.sockssocketi...@7886c8e2
>    at java.net.ServerSocket.implAccept(ServerSocket.java:453)
>    at java.net.ServerSocket.accept(ServerSocket.java:421)
>    at 
> sun.rmi.transport.tcp.TCPTransport$AcceptLoop.executeAcceptLoop(TCPTransport.java:369)
>    at sun.rmi.transport.tcp.TCPTransport$AcceptLoop.run(TCPTransport.java:341)
>    at java.lang.Thread.run(Thread.java:619)
>
>   Locked ownable synchronizers:
>    - None
>
> "Signal Dispatcher" - Thread t...@5
>   java.lang.Thread.State: RUNNABLE
>
>   Locked ownable synchronizers:
>    - None
>
> "Finalizer" - Thread t...@3
>   java.lang.Thread.State: WAITING on java.lang.ref.referencequeue$l...@b485e43
>    at java.lang.Object.wait(Native Method)
>    at java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:118)
>    at java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:134)
>    at java.lang.ref.Finalizer$FinalizerThread.run(Finalizer.java:159)
>
>   Locked ownable synchronizers:
>    - None
>
> "Reference Handler" - Thread t...@2
>   java.lang.Thread.State: WAITING on java.lang.ref.reference$l...@3c24867e
>    at java.lang.Object.wait(Native Method)
>    at java.lang.Object.wait(Object.java:485)
>    at java.lang.ref.Reference$ReferenceHandler.run(Reference.java:116)
>
>   Locked ownable synchronizers:
>    - None
>
> ---
>
> Respectfully Yours,
> Luke Forehand
> Software Engineer
> Networked Insights
> http://www.networkedinsights.com
>

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