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From "Cristian Ivascu (JIRA)" <j...@apache.org>
Subject [jira] Created: (HDFS-762) Trying to start the balancer throws a NPE
Date Tue, 10 Nov 2009 22:53:27 GMT
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


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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