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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