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Date: Fri, 20 Jun 2008 05:49:45 -0700 (PDT)
From: "Hudson (JIRA)" <jira@apache.org>
To: core-dev@hadoop.apache.org
Subject: [jira] Commented: (HADOOP-3576) hadoop dfs -mv throws
 NullPointerException
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    [ https://issues.apache.org/jira/browse/HADOOP-3576?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12606730#action_12606730 ] 

Hudson commented on HADOOP-3576:
--------------------------------

Integrated in Hadoop-trunk #524 (See [http://hudson.zones.apache.org/hudson/job/Hadoop-trunk/524/])

> hadoop dfs -mv throws NullPointerException
> ------------------------------------------
>
>                 Key: HADOOP-3576
>                 URL: https://issues.apache.org/jira/browse/HADOOP-3576
>             Project: Hadoop Core
>          Issue Type: Bug
>          Components: dfs
>    Affects Versions: 0.18.0
>            Reporter: Lohit Vijayarenu
>            Assignee: Tsz Wo (Nicholas), SZE
>            Priority: Blocker
>             Fix For: 0.18.0
>
>         Attachments: 3567_20080618.patch
>
>
> hadoop dfs -mv command throws NullPointerException while moving a directory to its subdirecotry. In 0.17 version, such a move was not allowed. 
> Consider the example
> {noformat}
> [lohit@ hadoop-core-trunk]$ ./bin/hadoop dfs -mv /a/b /a/b/c
> mv: java.io.IOException: java.lang.NullPointerException
> [lohit@ hadoop-core-trunk]$ 
> {noformat}
> After this, the namespace of /a/b is gone
> {noformat}
> [lohit@ hadoop-core-trunk]$ ./bin/hadoop dfs -lsr /a
> [lohit@ hadoop-core-trunk]$ 
> {noformat}
> Restarting the namenode recovers this namespace and everything seems to be normal.
> On the other hand, before restarting the namenode, if we delete the directory /a, it succeeds. 
> {noformat}
> [lohit@ hadoop-core-trunk]$ ./bin/hadoop dfs -rmr /a
> Deleted hdfs://jamba.juice:8020/a
> [lohit@ hadoop-core-trunk]$ 
> {noformat}
> But, restarting now, throws an exception on NameNode and NameNode wouldn't start.
> {noformat}
> 2008-06-17 00:58:50,422 ERROR org.apache.hadoop.dfs.NameNode: java.lang.NullPointerException
>   at org.apache.hadoop.dfs.FSNamesystem.changeLease(FSNamesystem.java:4339)
>   at org.apache.hadoop.dfs.FSEditLog.loadFSEdits(FSEditLog.java:561)
>   at org.apache.hadoop.dfs.FSImage.loadFSEdits(FSImage.java:846)
>   at org.apache.hadoop.dfs.FSImage.loadFSImage(FSImage.java:675)
>   at org.apache.hadoop.dfs.FSImage.recoverTransitionRead(FSImage.java:289)
>   at org.apache.hadoop.dfs.FSDirectory.loadFSImage(FSDirectory.java:80)
>   at org.apache.hadoop.dfs.FSNamesystem.initialize(FSNamesystem.java:273)
>   at org.apache.hadoop.dfs.FSNamesystem.<init>(FSNamesystem.java:252)
>   at org.apache.hadoop.dfs.NameNode.initialize(NameNode.java:148)
>   at org.apache.hadoop.dfs.NameNode.<init>(NameNode.java:193)
>   at org.apache.hadoop.dfs.NameNode.<init>(NameNode.java:179)
>   at org.apache.hadoop.dfs.NameNode.createNameNode(NameNode.java:825)
>   at org.apache.hadoop.dfs.NameNode.main(NameNode.java:834)
> {noformat}
> In hadoop 0.17, we never allowed such a move.
> {noformat}
> [lohit@ branch-0.17]$ ./bin/hadoop dfs -mv /a/b /a/b/c
> mv: Failed to rename /a/b to /a/b/c
> [lohit@ branch-0.17]$ 
> {noformat}
> This is the issue seen with HADOOP-3561. Opening this JIRA to fix the underlying problem while HADOOP-3561 could be committed. 

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