[HDFS-1782] FSNamesystem.startFileInternal(..) throws NullPointerException

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 0.22.0
• Fix Version/s: 0.22.0, 0.23.0
• Component/s: namenode
• Hadoop Flags: Reviewed
• Assignee: John George
• Reporter: John George
• Created: 24/Mar/11 21:49
• Updated: 15/Nov/11 00:52
• Resolved: 30/Mar/11 22:37

Description

I'm observing when there is one balancer running trying to run another one results in
"Java.lang.NullPointerException" error. I was hoping to see message "Another balancer is running.
Exiting.... Exiting ...". This is a reproducible issue.

Details
========

1) Cluster ->elrond

[hdfs@]$ hadoop version

2) Run first balancer
[hdfs]$ hdfs balancer
1
through XX.XX.XX.XX:1004 is succeeded.
[hdfs@]$ hdfs balancer
11/03/09 16:34:32 INFO balancer.Balancer: namenodes =
java.io.IOException: java.lang.NullPointerException
at org.apache.hadoop.hdfs.server.namenode.FSNamesystem.startFileInternal(FSNamesystem.java:1400)
at org.apache.hadoop.hdfs.server.namenode.FSNamesystem.startFile(FSNamesystem.java:1284)
at org.apache.hadoop.hdfs.server.namenode.NameNode.create(NameNode.java:779)
at sun.reflect.GeneratedMethodAccessor46.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.apache.hadoop.ipc.WritableRpcEngine$Server.call(WritableRpcEngine.java:346)
at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:1399)
at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:1395)
at java.security.AccessController.doPrivileged(Native Method)
at javax.security.auth.Subject.doAs(Subject.java:396)
at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1094)
at org.apache.hadoop.ipc.Server$Handler.run(Server.java:1393)
. Exiting ...
Balancing took 1.366 seconds