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From "Iyappan Srinivasan (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-5513) Balancer throws NullPointerException
Date Thu, 19 Mar 2009 09:17:50 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-5513?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12683382#action_12683382

Iyappan Srinivasan commented on HADOOP-5513:

The fs.default.name  property should be mentioned in core-site.xml and not in hdfs-site.xml.
If it is mentioned there, then this nullPointer exception wont occur.

Since balancer balances the namenode, it looks for namenode information under core-site.xml.
if it is not able to find it it gives NullPointer Exception. 

I tested to make sure of this.

> Balancer throws NullPointerException
> ------------------------------------
>                 Key: HADOOP-5513
>                 URL: https://issues.apache.org/jira/browse/HADOOP-5513
>             Project: Hadoop Core
>          Issue Type: Bug
>          Components: dfs
>    Affects Versions: 0.20.0
>            Reporter: Ramya R
>            Priority: Minor
>             Fix For: 0.20.0
> Balancer command seems to be throwing NullPointerException when run on 0.20 using fairshare

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