[jira] Commented: (HADOOP-2876) Streaming does not checks whether -mapper option is provided or not

["lohit vijayarenu (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HADOOP-2876?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12598729#action_12598729 ] 

lohit vijayarenu commented on HADOOP-2876:
------------------------------------------

Looks good. Should we default to IdentityMapper if no mapper is specified in streaming?
Few things about test case
- It would be good to change testCommandLineNoMapper() to testCommandOptions() so that tomorrow if we add more arguments checking, one could just update this method
- Test has this line {{fail("Required Argument: -mapper");}} It would be good to get back return status from job.go() as failure and then print this message. 

> Streaming does not checks whether  -mapper option is provided or not
> --------------------------------------------------------------------
>
>                 Key: HADOOP-2876
>                 URL: https://issues.apache.org/jira/browse/HADOOP-2876
>             Project: Hadoop Core
>          Issue Type: Bug
>          Components: contrib/streaming
>    Affects Versions: 0.17.0
>            Reporter: Karam Singh
>            Priority: Minor
>         Attachments: hadoop-2876.txt
>
>
> Ran hadoop command as -:
> bin/hadoop jar contrib/streaming/hadoop-*-streaming.jar -input in -output out
> (Here no mapper is provided using -mapper option).
> Stream job will start and map of that job fails.
> Streaming should check about the presence of -mapper option and throw proper error is it not there.

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