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From "Runping Qi (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-619) Unify Map-Reduce and Streaming to take the same globbed input specification
Date Fri, 01 Dec 2006 16:52:23 GMT
    [ http://issues.apache.org/jira/browse/HADOOP-619?page=comments#action_12454951 ] 
            
Runping Qi commented on HADOOP-619:
-----------------------------------


We should check the existence of the path(s), but leave the pattern matching to InputFormatBase
class.

We have three cases to consider: all paths exist, non exists, and some do, some do not.
Cases 1 and 2 are easy. Case 3, I hink it is reasonable that the job proceeds, but records
that in the job
status.

When a job starts, we may should record all the input directories and number of files under
it matching the pattern. If no file matches the pattern, the job should stop. Otherwise, the
job generates splits from the matched files and proceeds.

> 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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