[jira] Updated: (HBASE-2737) CME in ZKW introduced in HBASE-2694

["Karthik Ranganathan (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HBASE-2737?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Karthik Ranganathan updated HBASE-2737:
---------------------------------------

    Attachment: HBASE-2737-0.21.patch

Making the register and unregister methods synchronized. Unit tests are passing. This change is so simple I am not putting it up on review board.

> CME in ZKW introduced in HBASE-2694
> -----------------------------------
>
>                 Key: HBASE-2737
>                 URL: https://issues.apache.org/jira/browse/HBASE-2737
>             Project: HBase
>          Issue Type: Bug
>            Reporter: Jean-Daniel Cryans
>            Assignee: Karthik Ranganathan
>             Fix For: 0.21.0
>
>         Attachments: HBASE-2737-0.21.patch
>
>
> Saw this while tail'ing a log for something else:
> {code}
> 2010-06-15 17:30:03,769 ERROR [main-EventThread] zookeeper.ClientCnxn$EventThread(490): Error while calling watcher
> java.util.ConcurrentModificationException
>         at java.util.AbstractList$Itr.checkForComodification(AbstractList.java:372)
>         at java.util.AbstractList$Itr.next(AbstractList.java:343)
>         at org.apache.hadoop.hbase.zookeeper.ZooKeeperWrapper.process(ZooKeeperWrapper.java:235)
> {code}
> Looks like the listeners list's iterator is used in an unprotected manner.

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