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From Jordan Zimmerman <jor...@jordanzimmerman.com>
Subject Re: NullPointerException on ContainerManager
Date Mon, 04 Jul 2016 16:23:05 GMT
Please open an issue in Jira (http://issues.apache.org/jira/browse/ZOOKEEPER) and assign it
to me (randgalt / Jordan Zimmerman).

Thank you!

-Jordan

> On Jul 4, 2016, at 11:18 AM, Stefano Salmaso <stefano.salmaso@lastminute.com> wrote:
> 
> Hi Apache ZooKeeper community,
> I would like to expose you to a problem that we are experiencing.
> We are using a cluster of 7 zookeeper and we use them to implement a
> distributed lock using Curator (
> http://curator.apache.org/curator-recipes/shared-reentrant-lock.html)
> So .. we tried to play with the servers to see if everything worked
> properly and we stopped and start servers to see that the system worked well
> (like stop 03, stop 05, stop 06, start 05, start 06, start 03)
> 
> We saw a strange behavior.
> The number of znodes grew up without stopping (normally we had 4000 or
> 5000, we got to 60,000 and then we stopped our application)
> 
> In zookeeeper logs I saw this (on leader only, one every minute)
> 
> 2016-07-04 14:53:50,302 [myid:7] - ERROR
> [ContainerManagerTask:ContainerManager$1@84] - Error checking containers
> java.lang.NullPointerException
>       at
> org.apache.zookeeper.server.ContainerManager.getCandidates(ContainerManager.java:151)
>       at
> org.apache.zookeeper.server.ContainerManager.checkContainers(ContainerManager.java:111)
>       at
> org.apache.zookeeper.server.ContainerManager$1.run(ContainerManager.java:78)
>       at java.util.TimerThread.mainLoop(Timer.java:555)
>       at java.util.TimerThread.run(Timer.java:505)
> 
> Have you notice of this?
> Could be a bug?
> 
> Kind regards,
> Stefano.
> 
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