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From Martin Serrano <mar...@attivio.com>
Subject Re: Thread dump looks OK?
Date Sat, 24 Oct 2015 02:21:03 GMT
This is a normal stack trace.  It is a zookeeper client thread waiting
for watch notifications and such.

-Martin

On 10/23/2015 09:04 PM, John Lindwall wrote:
> We use zookeeper 3.4.6
>
> Our webapp running in a tomcat server suffered a condition where user 
> sessions seemed to "freeze". We got a single thread dump at that time. I 
> am curious about a particular stacktrace that is seen in the thread 
> dump, related to zookeeper.
>
> Does the following stacktrace cause any alarm or concern?  Thanks!
>
> "ajp-bio-8012-exec-561-EventThread" daemon prio=3 tid=0x0000000105a46000 
> nid=0x11fa waiting on condition [0xfffffffd967ff000]
>
>     java.lang.Thread.State: WAITING (parking)
>
>                  at sun.misc.Unsafe.park(Native Method)
>
> - parking to wait for <0xffffffff11fd9110> (a 
> java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject)
>
>                  at 
> java.util.concurrent.locks.LockSupport.park(LockSupport.java:186)
>
>                  at 
> java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:2043)
>
>                  at 
> java.util.concurrent.LinkedBlockingQueue.take(LinkedBlockingQueue.java:442)
>
>                  at 
> org.apache.zookeeper.ClientCnxn$EventThread.run(ClientCnxn.java:494)
>


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