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https://issues.apache.org/jira/browse/HADOOP-1178?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12485594
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Hadoop QA commented on HADOOP-1178:
-----------------------------------
Integrated in Hadoop-Nightly #42 (See
http://lucene.zones.apache.org:8080/hudson/job/Hadoop-Nightly/42/)
> NullPointer Exception in org.apache.hadoop.dfs.NameNode.isDir on namenode
> restart
> ---------------------------------------------------------------------------------
>
> Key: HADOOP-1178
> URL: https://issues.apache.org/jira/browse/HADOOP-1178
> Project: Hadoop
> Issue Type: Bug
> Components: dfs
> Affects Versions: 0.13.0
> Reporter: dhruba borthakur
> Assigned To: dhruba borthakur
> Fix For: 0.13.0
>
> Attachments: namenodestart2.patch
>
>
> On a namenode restart, I sometimes get the following exception. The problem
> is that the RPC server is initialized before the namenode data structures are
> initialized. This means that an RPC starts getting processed by the namenode
> before its data structures are consistent. The fix is to first initialize the
> namesystem and then start the RPC server.
> NFO org.apache.hadoop.ipc.Server: IPC Server handler 1 on 50000 call error:
> java.io.IOException: java.lang.NullPointerException
> java.io.IOException: java.lang.NullPointerException
> at org.apache.hadoop.dfs.NameNode.isDir(NameNode.java:438)
> at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
> at
> sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
> at
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
> at java.lang.reflect.Method.invoke(Method.java:597)
> at org.apache.hadoop.ipc.RPC$Server.call(RPC.java:339)
> at org.apache.hadoop.ipc.Server$Handler.run(Server.java:564)
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