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From "dhruba borthakur (JIRA)" <j...@apache.org>
Subject [jira] Assigned: (HADOOP-1178) NullPointer Exception in org.apache.hadoop.dfs.NameNode.isDir on namenode restart
Date Wed, 28 Mar 2007 21:39:25 GMT

     [ https://issues.apache.org/jira/browse/HADOOP-1178?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

dhruba borthakur reassigned HADOOP-1178:
----------------------------------------

    Assignee: dhruba borthakur

> 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
>            Reporter: dhruba borthakur
>         Assigned To: dhruba borthakur
>             Fix For: 0.12.2
>
>
> 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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