Aaron T. Myers created HDFS-3439:
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             Summary: Balancer exits if fs.defaultFS is set to a different, but semantically identical, URI from dfs.namenode.rpc-address
                 Key: HDFS-3439
                 URL: https://issues.apache.org/jira/browse/HDFS-3439
             Project: Hadoop HDFS
          Issue Type: Bug
          Components: balancer
    Affects Versions: 2.0.0
            Reporter: Aaron T. Myers


The balancer determines the set of NN URIs to balance by looking at fs.defaultFS and all possible dfs.namenode.(service)rpc-address settings. If fs.defaultFS is, for example, set to "hdfs://foo.example.com:8020/" (note the trailing "/") and the rpc-address is set to "hdfs://foo.example.com:8020" (without a "/"), then the balancer will conclude that there are two NNs and try to balance both. However, since both of these URIs refer to the same actual FS instance, the balancer will exit with "java.io.IOException: Another balancer is running.  Exiting ..."

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