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From "Jordan Zimmerman (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (ZOOKEEPER-2464) NullPointerException on ContainerManager
Date Mon, 04 Jul 2016 22:49:11 GMT

     [ https://issues.apache.org/jira/browse/ZOOKEEPER-2464?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Jordan Zimmerman updated ZOOKEEPER-2464:
----------------------------------------
    Attachment: ZOOKEEPER-2464.patch

node.getChildren() can legally return null

> NullPointerException on ContainerManager
> ----------------------------------------
>
>                 Key: ZOOKEEPER-2464
>                 URL: https://issues.apache.org/jira/browse/ZOOKEEPER-2464
>             Project: ZooKeeper
>          Issue Type: Bug
>          Components: server
>    Affects Versions: 3.5.1
>            Reporter: Stefano Salmaso
>            Assignee: Jordan Zimmerman
>         Attachments: ZOOKEEPER-2464.patch
>
>
> 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)
> We have not yet deleted the data ... so the problem can be reproduced on our servers



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