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From "Steve Loughran (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-4558) start balancer failed with NPE
Date Wed, 06 Mar 2013 13:58:13 GMT

    [ https://issues.apache.org/jira/browse/HDFS-4558?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13594719#comment-13594719
] 

Steve Loughran commented on HDFS-4558:
--------------------------------------

What's your block placement policy? Something non-standard?
                
> start balancer failed with NPE
> ------------------------------
>
>                 Key: HDFS-4558
>                 URL: https://issues.apache.org/jira/browse/HDFS-4558
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: balancer
>            Reporter: wenwupeng
>            Priority: Critical
>             Fix For: 1.2.0
>
>
> start balancer failed with NPE
>  File this issue to track for QE and dev take a look
> balancer.log:
>  2013-03-06 00:19:55,174 ERROR org.apache.hadoop.hdfs.server.balancer.Balancer: java.lang.NullPointerException
>  at org.apache.hadoop.hdfs.server.namenode.BlockPlacementPolicy.getInstance(BlockPlacementPolicy.java:165)
>  at org.apache.hadoop.hdfs.server.balancer.Balancer.checkReplicationPolicyCompatibility(Balancer.java:799)
>  at org.apache.hadoop.hdfs.server.balancer.Balancer.<init>(Balancer.java:808)
>  at org.apache.hadoop.hdfs.server.balancer.Balancer.main(Balancer.java:831)
> Balancer.java
>  private void checkReplicationPolicyCompatibility(Configuration conf)
>  throws UnsupportedActionException {
>  if (!(BlockPlacementPolicy.getInstance(conf, null, null) <== here
>  instanceof BlockPlacementPolicyDefault)) 
> { throw new UnsupportedActionException( "Balancer without BlockPlacementPolicyDefault");
}
>  }

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