[HADOOP-619] Unify Map-Reduce and Streaming to take the same globbed input specification

• Type: Improvement
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 0.9.1
• Fix Version/s: 0.10.0
• Assignee: Sanjay Dahiya
• Reporter: Eric Baldeschwieler
• Created: 20/Oct/06 21:00
• Updated: 02/May/13 02:29
• Resolved: 05/Jan/07 20:13

Description

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?

Issue Links

• is depended upon by: HADOOP-788 Streaming should use a subclass of TextInputFormat for reading text inputs.