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From "Joseph Adler (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (CRUNCH-165) Pipelines should automatically use CombineFileInputFormat where input consists of many small files
Date Mon, 18 Mar 2013 20:13:17 GMT

     [ https://issues.apache.org/jira/browse/CRUNCH-165?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Joseph Adler updated CRUNCH-165:
--------------------------------

    Attachment: CRUNCH-165.patch

Here is my patch to Crunch to use CombineFileInputFormat.
                
> Pipelines should automatically use CombineFileInputFormat where input consists of many
small files
> --------------------------------------------------------------------------------------------------
>
>                 Key: CRUNCH-165
>                 URL: https://issues.apache.org/jira/browse/CRUNCH-165
>             Project: Crunch
>          Issue Type: Improvement
>          Components: Core
>    Affects Versions: 0.4.0
>            Reporter: Dave Beech
>            Assignee: Josh Wills
>         Attachments: CRUNCH-165.patch
>
>
> Hive had a feature introduced in HIVE-74 whereby CombineFileInputFormat would be used
if the input data consisted of many small files, making the resulting mapreduce jobs more
efficient by giving individual mappers more data to process. This would be a nice feature
for Crunch to have, too.

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