Mingliang Liu created HDFS-10986:
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             Summary: DFSAdmin should show detailed error message if any
                 Key: HDFS-10986
                 URL: https://issues.apache.org/jira/browse/HDFS-10986
             Project: Hadoop HDFS
          Issue Type: Bug
          Components: tools
    Affects Versions: 2.8.0
            Reporter: Mingliang Liu
            Assignee: Mingliang Liu


There are some subcommands in {{DFSAdmin}} that swallow IOException and give 
very limited error message, if any, to the stderr.

{code}
$ hdfs dfsadmin -getDatanodeInfo localhost:9866
Datanode unreachable.
$ hdfs dfsadmin -evictWriters 127.0.0.1:9866
$ echo $?
-1
{code}

We should fix this by providing detailed error message. Actually, the 
{{DFSAdmin#run}} already handles exception carefully. All we need to do is to 
not swallow exceptions without good reason.



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