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https://issues.apache.org/jira/browse/HDFS-2220?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Tsz Wo Nicholas Sze resolved HDFS-2220.
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Resolution: Cannot Reproduce
Let's resolve this as Cannot Reproduce.
> balancer.Balancer: java.lang.NullPointerException while HADOOP_CONF_DIR is
> empty or wrong
> -----------------------------------------------------------------------------------------
>
> Key: HDFS-2220
> URL: https://issues.apache.org/jira/browse/HDFS-2220
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: balancer & mover
> Affects Versions: 0.20.204.0
> Reporter: Rajit Saha
>
> When HADOOP_CONF_DIR is empty or wrongly set and balancer is called without
> proper --config , in clientside STDOUT we get NPE.
> $ echo $HADOOP_CONF_DIR
> $ hadoop balancer
> Balancing took 46.0 milliseconds
> 11/06/13 05:14:04 ERROR balancer.Balancer: java.lang.NullPointerException
> at org.apache.hadoop.net.NetUtils.createSocketAddr(NetUtils.java:136)
> at
> org.apache.hadoop.hdfs.server.namenode.NameNode.getAddress(NameNode.java:176)
> at
> org.apache.hadoop.hdfs.server.namenode.NameNode.getAddress(NameNode.java:206)
> at
> org.apache.hadoop.hdfs.server.namenode.NameNode.getServiceAddress(NameNode.java:200)
> at
> org.apache.hadoop.hdfs.server.balancer.Balancer.createNamenode(Balancer.java:911)
> at
> org.apache.hadoop.hdfs.server.balancer.Balancer.init(Balancer.java:860)
> at
> org.apache.hadoop.hdfs.server.balancer.Balancer.run(Balancer.java:1475)
> at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:65)
> at
> org.apache.hadoop.hdfs.server.balancer.Balancer.main(Balancer.java:811)
> I think it would be good to give more meaningful error messege instead of NPE
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