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From "Owen O'Malley (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-619) Unify Map-Reduce and Streaming to take the same globbed input specification
Date Mon, 04 Dec 2006 22:17:23 GMT
    [ http://issues.apache.org/jira/browse/HADOOP-619?page=comments#action_12455431 ] 
            
Owen O'Malley commented on HADOOP-619:
--------------------------------------

I think that streaming should stop using the filename globbing for --input and instead list
a set of input directories.

I think that the InputFormatBase should support a regex filter on filenames that should default
to something like "[^_].*" so that any file that starts with an "_" is not treated as input.
This will allow us to put things like _LOGS as a filename to store the log files for a job.

Streaming should then support the regex filename filters using "--input-filter" with a regex
that filters the filenames.

> 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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