[HBASE-13901] Error while calling watcher on creating and deleting an HBase table

• Type: Bug
• Status: Closed
• Priority: Minor
• Resolution: Fixed
• Fix Version/s: 0.98.14, 1.0.2, 1.2.0, 1.1.1, 2.0.0
• Hadoop Flags: Reviewed
• Assignee: Ashish Singhi
• Reporter: Neha Bathra
• Due: 15/Jul/15
• Created: 15/Jun/15 11:39
• Updated: 31/Aug/15 22:39
• Resolved: 15/Jun/15 18:35

Description

[Scenario for Reproducing ] :
1. Create and delete 10 different HBase tables concurrently (10 threads creating, disabling and deleting their own tables)
2. Check the HBase Master logs( Null Pointer Exceptions observed caused by data race)

ERROR [main-EventThread] zookeeper.ClientCnxn: Error while calling watcher 
java.lang.NullPointerException
 at org.apache.hadoop.hbase.zookeeper.ZKUtil$NodeAndData.isEmpty(ZKUtil.java:667)
 at org.apache.hadoop.hbase.security.access.ZKPermissionWatcher.refreshNodes(ZKPermissionWatcher.java:152)
 at org.apache.hadoop.hbase.security.access.ZKPermissionWatcher.nodeChildrenChanged(ZKPermissionWatcher.java:142)
 at org.apache.hadoop.hbase.zookeeper.ZooKeeperWatcher.process(ZooKeeperWatcher.java:439)
 at org.apache.zookeeper.ClientCnxn$EventThread.processEvent(ClientCnxn.java:543)
 at org.apache.zookeeper.ClientCnxn$EventThread.run(ClientCnxn.java:518)
2015-06-05 20:32:04,553 INFO  [B.defaultRpcServer.handler=24,queue=4,port=16000] client.ConnectionManager$HConnectionImplementation: Closing zookeeper sessionid=0x200541f1fd400c0
2015-06-05 20:32:04,561 INFO  [B.defaultRpcServer.handler=24,queue=4,port=16000] zookeeper.ZooKeeper: Session: 0x200541f1fd400c0 closed
2015-06-05 20:32:04,561 INFO  [B.defaultRpcServer.handler=24,queue=4,port=16000-EventThread] zookeeper.ClientCnxn: EventThread shut down
2015-06-05 20:32:04,631 INFO  [B.defaultRpcServer.handler=7,queue=2,port=16000] client.ConnectionManager$HConnectionImplementation: Closing zookeeper sessionid=0x200541f1fd400c2
2015-06-05 20:32:04,644 INFO  [B.defaultRpcServer.handler=7,queue=2,port=16000] zookeeper.ZooKeeper: Session: 0x200541f1fd400c2 closed
2015-06-05 20:32:04,644 INFO  [B.defaultRpcServer.handler=7,queue=2,port=16000-EventThread] zookeeper.ClientCnxn: EventThread shut down