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From "Christian Kunz (JIRA)" <j...@apache.org>
Subject [jira] Created: (HADOOP-733) dfs shell has inconsistent exit codes
Date Fri, 17 Nov 2006 16:53:40 GMT
dfs shell has inconsistent exit codes

                 Key: HADOOP-733
                 URL: http://issues.apache.org/jira/browse/HADOOP-733
             Project: Hadoop
          Issue Type: Bug
          Components: dfs
    Affects Versions: 0.8.0
            Reporter: Christian Kunz

After upgrading to 0.8.0, some of my script applications stopped to work properly, seemingly
because of hadoop dfs utility returning 0 exit code when it should not (kind of revival of
hadoop-488, with a different cause).

dfs -cat  and dfs -rm always return exit code 0, even for non-existing files. The former can
be traced back to the fact that DFSShell's 'run' method calls a 'doall' method without passing
on the exit code ('doall' catches its own exceptions and returns an exit code). The latter
occurs because the return code of the DFSClient delete method is only used in DFS Shell to
print different messages without affecting exit code.

There might be more inconsistent behavior of the dfs shell. Hadoop dfs command line should
return 0 signaling success exactly when the corresponding unix command returns 0 (or at least
it should be related to success whatever this means in a documented manner).

I also would recommend to use a kind of regression test to prevent that this gets broken again.

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