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https://issues.apache.org/jira/browse/HBASE-3056?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12916586#action_12916586
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stack commented on HBASE-3056:
------------------------------
+1
> 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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