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From "Owen O'Malley (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HADOOP-619) Unify Map-Reduce and Streaming to take the same globbed input specification
Date Thu, 14 Dec 2006 22:44:23 GMT
     [ http://issues.apache.org/jira/browse/HADOOP-619?page=all ]

Owen O'Malley updated HADOOP-619:

               Status: Open  (was: Patch Available)
        Fix Version/s: 0.10.0
    Affects Version/s: 0.9.1

A couple of things:
  1. You shouldn't use the "ignored" FileSystem. You should use the file system for that particular
path. (path.getFileSystem(conf)).
  2. I think the error conditions should be that either:
     a. The list of input directories is empty. (conf.getIputPaths().length == 0)
     b. Any glob pattern matches no files or directories.
  3. the hiddenFileFilter is cleaner as:
    public boolean accept(Path p) {
      return !name.startsWith("_") && !name.startsWith(".");

> 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
>    Affects Versions: 0.9.1
>            Reporter: eric baldeschwieler
>         Assigned To: Sanjay Dahiya
>             Fix For: 0.10.0
>         Attachments: Hadoop-619.patch, Hadoop-619.patch, Hadoop-619.patch, Hadoop-619_1.patch,
> 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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