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From "Sanjay Dahiya (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-619) Unify Map-Reduce and Streaming to take the same globbed input specification
Date Tue, 05 Dec 2006 19:42:23 GMT
    [ http://issues.apache.org/jira/browse/HADOOP-619?page=comments#action_12455739 ] 
            
Sanjay Dahiya commented on HADOOP-619:
--------------------------------------

These changes cause TestEmptyJobWithDFS test to fail as in that no of input files is 0. with
new changes Job fails if there are no input files in the inputs paths after glob expansion.


Do we need the ability to run empty jobs or do we want to specify some extra flag stating
input not needed for the job? The test case will need to be changed then as well. 

Comments? 

> Unify Map-Reduce and Streaming to take the same globbed input specification
> ---------------------------------------------------------------------------
>
>                 Key: HADOOP-619
>                 URL: http://issues.apache.org/jira/browse/HADOOP-619
>             Project: Hadoop
>          Issue Type: Improvement
>          Components: mapred
>            Reporter: eric baldeschwieler
>         Assigned To: Sanjay Dahiya
>
> Right now streaming input is specified very differently from other map-reduce input.
 It would be good if these two apps could take much more similar input specs.
> In particular -input in streaming expects a file or glob pattern while MR takes a directory.
 It would be cool if both could take a glob patern of files and if both took a directory by
default (with some patern excluded to allow logs, metadata and other framework output to be
safely stored).
> We want to be sure that MR input is backward compatible over this change.  I propose
that a single file should be accepted as an input or a single directory.  Globs should only
match directories if the paterns is '/' terminated, to avoid massive inputs specified by mistake.
> Thoughts?

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