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From "Robert Chansler (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HADOOP-4565) MultiFileInputSplit can use data locality information to create splits
Date Thu, 19 Mar 2009 00:01:51 GMT

     [ https://issues.apache.org/jira/browse/HADOOP-4565?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Robert Chansler updated HADOOP-4565:
------------------------------------

    Release Note: Improved MultiFileInputFormat so that multiple blocks from the same node
or same rack can be combined into a single split.  (was: Multiple blocks from the same node
or same rack can be combined into a single split.)

Edit release notes for publication.

> MultiFileInputSplit can use data locality information to create splits
> ----------------------------------------------------------------------
>
>                 Key: HADOOP-4565
>                 URL: https://issues.apache.org/jira/browse/HADOOP-4565
>             Project: Hadoop Core
>          Issue Type: Improvement
>          Components: mapred
>            Reporter: dhruba borthakur
>            Assignee: dhruba borthakur
>             Fix For: 0.20.0, 0.21.0
>
>         Attachments: CombineMultiFile.patch, CombineMultiFile2.patch, CombineMultiFile3.patch,
CombineMultiFile4.patch, CombineMultiFile5.patch, CombineMultiFile7.patch, CombineMultiFile8.patch,
CombineMultiFile9.patch, TestCombine.txt
>
>
> The MultiFileInputFormat takes a set of paths and creates splits based on file sizes.
Each splits contains a few files an each split are roughly equal in size. It would be efficient
if we can extend this InputFormat to create splits such each all the blocks in one split and
either node-local or rack-local.

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