Fix ordering in ZKWatcher constructor to prevent weird race condition
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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
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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