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From "Josh Wills (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (CRUNCH-165) Pipelines should automatically use CombineFileInputFormat where input consists of many small files
Date Mon, 25 Mar 2013 18:17:18 GMT

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

Josh Wills updated CRUNCH-165:
------------------------------

    Attachment: CRUNCH-165-jwills.patch

Here's the result of my Friday hacking (which, to be fair, sort of spilled into Saturday and
Sunday.) I modeled this after Pig's approach, but simplified the implementation. There are
a bunch of tests on fake splits-- I would love some recs on other edge cases to consider.
                
> 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-jwills.patch, 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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