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From "Cristian Ivascu (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HDFS-762) Trying to start the balancer throws a NPE
Date Tue, 10 Nov 2009 23:17:27 GMT

    [ https://issues.apache.org/jira/browse/HDFS-762?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12776152#action_12776152
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Cristian Ivascu commented on HDFS-762:
--------------------------------------

A more logical description of the proposed patch (cannot edit previous comment):

The attached file contains a patch that changes the behavior of the Balancer() constructor
(with no parameters) to basically do nothing (like the 0.20 version), and a test in the TestBalancer
class. 

> Trying to start the balancer throws a NPE
> -----------------------------------------
>
>                 Key: HDFS-762
>                 URL: https://issues.apache.org/jira/browse/HDFS-762
>             Project: Hadoop HDFS
>          Issue Type: Bug
>    Affects Versions: 0.21.0
>            Reporter: Cristian Ivascu
>             Fix For: 0.21.0
>
>         Attachments: 0001-corrected-balancer-constructor.patch
>
>
> When trying to run the balancer, I get a NullPointerException:
> 2009-11-10 11:08:14,235 ERROR org.apache.hadoop.hdfs.server.balancer.Balancer: java.lang.NullPointerException
>         at org.apache.hadoop.hdfs.server.namenode.BlockPlacementPolicy.getInstance(BlockPlacementPolicy.java:161)
>         at org.apache.hadoop.hdfs.server.balancer.Balancer.checkReplicationPolicyCompatibility(Balancer.java:784)
>         at org.apache.hadoop.hdfs.server.balancer.Balancer.<init>(Balancer.java:792)
>         at org.apache.hadoop.hdfs.server.balancer.Balancer.main(Balancer.java:814)
> This happens when trying to use bin/start-balancer or bin/hdfs balancer -threshold 10
> The config files (hdfs-site and core-site) have as fs.default.name hdfs://namenode:9000.

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