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Posted to issues@hbase.apache.org by "Jonathan Gray (JIRA)" <ji...@apache.org> on 2010/09/30 20:23:32 UTC
[jira] Resolved: (HBASE-3056) Fix ordering in ZKWatcher constructor
to prevent weird race condition
[ https://issues.apache.org/jira/browse/HBASE-3056?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Jonathan Gray resolved HBASE-3056.
----------------------------------
Hadoop Flags: [Reviewed]
Resolution: Fixed
Committed. Thanks for review stack.
> Fix ordering in ZKWatcher constructor to prevent weird race condition
> ---------------------------------------------------------------------
>
> Key: HBASE-3056
> URL: https://issues.apache.org/jira/browse/HBASE-3056
> Project: HBase
> Issue Type: Bug
> Components: zookeeper
> Affects Versions: 0.90.0
> Reporter: Jonathan Gray
> Assignee: Jonathan Gray
> Fix For: 0.90.0
>
> Attachments: HBASE-3056-v1.patch
>
>
> A small race condition in ZKWatcher leads to an NPE:
> {noformat}
> 2010-09-30 10:56:36,028 INFO [Thread-217] zookeeper.ZKUtil(93): hconnection opening connection to ZooKeeper with quorum (localhost:21815)
> 2010-09-30 10:56:36,036 DEBUG [Thread-217-EventThread] zookeeper.ZooKeeperWatcher(184): hconnection Received ZooKeeper Event, type=None, state=SyncConnected, path=null
> 2010-09-30 10:56:36,036 ERROR [Thread-217-EventThread] zookeeper.ClientCnxn$EventThread(490): Error while calling watcher
> java.lang.NullPointerException
> at org.apache.hadoop.hbase.zookeeper.ZooKeeperWatcher.connectionEvent(ZooKeeperWatcher.java:243)
> at org.apache.hadoop.hbase.zookeeper.ZooKeeperWatcher.process(ZooKeeperWatcher.java:193)
> at org.apache.zookeeper.ClientCnxn$EventThread.run(ClientCnxn.java:488)
> {noformat}
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