[ http://issues.apache.org/jira/browse/HADOOP-733?page=all ]
dhruba borthakur updated HADOOP-733:
------------------------------------
Status: Patch Available (was: Open)
This patch contains a fix to return appropriate error codes while trying to
delete or cat a non-existent file. It also has a regression-test-case to test
the return codes from DFSShell. The test case currently has tests for 'cat' and
'rm' and I will be adding to it in the future.
> 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
> Assigned To: dhruba borthakur
> Attachments: shellerrorcodes.patch
>
>
> 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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