balancer.Balancer: java.lang.NullPointerException while HADOOP_CONF_DIR is
empty or wrong
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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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