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From "Tsz Wo (Nicholas), SZE (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HDFS-1684) Federation: Balancer cannot start with with multiple namenodes.
Date Thu, 03 Mar 2011 18:02:36 GMT

    [ https://issues.apache.org/jira/browse/HDFS-1684?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13002112#comment-13002112
] 

Tsz Wo (Nicholas), SZE commented on HDFS-1684:
----------------------------------------------

Thanks Suresh for reviewing this.

{noformat}
     [exec] -1 overall.  
     [exec] 
     [exec]     +1 @author.  The patch does not contain any @author tags.
     [exec] 
     [exec]     +1 tests included.  The patch appears to include 3 new or modified tests.
     [exec] 
     [exec]     +1 javadoc.  The javadoc tool did not generate any warning messages.
     [exec] 
     [exec]     +1 javac.  The applied patch does not increase the total number of javac compiler
warnings.
     [exec] 
     [exec]     +1 findbugs.  The patch does not introduce any new Findbugs (version 1.3.9)
warnings.
     [exec] 
     [exec]     +1 release audit.  The applied patch does not increase the total number of
release audit warnings.
     [exec] 
     [exec]     -1 system test framework.  The patch failed system test framework compile.
{noformat}

Also checked the related unit tests.

> Federation: Balancer cannot start with with multiple namenodes.
> ---------------------------------------------------------------
>
>                 Key: HDFS-1684
>                 URL: https://issues.apache.org/jira/browse/HDFS-1684
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: balancer
>    Affects Versions: Federation Branch
>            Reporter: Tsz Wo (Nicholas), SZE
>            Assignee: Tsz Wo (Nicholas), SZE
>         Attachments: 4342723.patch, h1684_20110302.patch
>
>
> The balancer creates the file when it starts; and delete the files when it finishes.
 The default FileSystem is used for all NameNodes.  So only the first one will succeed creating
the
> id file but the following will fail.

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