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From "Rajit (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HDFS-2220) balancer.Balancer: java.lang.NullPointerException while HADOOP_CONF_DIR is empty or wrong
Date Wed, 03 Aug 2011 04:17:27 GMT
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
    Affects Versions: 0.20.204.0
            Reporter: Rajit


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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