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From "dhruba borthakur (JIRA)" <j...@apache.org>
Subject [jira] Commented: (MAPREDUCE-1501) FileInputFormat to support multi-level/recursive directory listing
Date Mon, 22 Feb 2010 22:18:34 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-1501?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12836948#action_12836948
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dhruba borthakur commented on MAPREDUCE-1501:
---------------------------------------------

I think Ian mentioned that you can enhance this feature by allowing the user to register a
set of PathFilters. That will allow the job to process only a selected subset of the subdirectories.

> FileInputFormat to support multi-level/recursive directory listing
> ------------------------------------------------------------------
>
>                 Key: MAPREDUCE-1501
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-1501
>             Project: Hadoop Map/Reduce
>          Issue Type: Improvement
>            Reporter: Zheng Shao
>            Assignee: Zheng Shao
>         Attachments: MAPREDUCE-1501.1.branch-0.20.patch, MAPREDUCE-1501.1.trunk.patch
>
>
> As we have seen multiple times in the mailing list, users want to have the capability
of getting all files out of a multi-level directory structure.
> 4/1/2008: http://mail-archives.apache.org/mod_mbox/hadoop-core-user/200804.mbox/%3Ce75c02ef0804011433x144813e6x2450da7883de3aca@mail.gmail.com%3E
> 2/3/2009: http://mail-archives.apache.org/mod_mbox/hadoop-core-user/200902.mbox/%3C7F80089C-3E7F-4330-90BA-6F1C5B0B0F3F@nist.gov%3E
> 6/2/2009: http://mail-archives.apache.org/mod_mbox/hadoop-common-user/200906.mbox/%3C4A258A16.8050300@darose.net%3E
> One solution that our users had is to write a new FileInputFormat, but that means all
existing FileInputFormat subclasses need to be changed in order to support this feature.
> We can easily provide a JobConf option (which defaults to false) to {{FileInputFormat.listStatus(...)}}
to recursively go into directory structure.

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