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From "Jothi Padmanabhan (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-4565) MultiFileInputSplit can use data locality information to create splits
Date Fri, 14 Nov 2008 08:38:44 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-4565?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12647545#action_12647545
] 

Jothi Padmanabhan commented on HADOOP-4565:
-------------------------------------------

The above patch will work only if  BlockLocations has topology information. i.e. getTopologyPaths()
returns valid data and not String[0].  Since it is not guaranteed that getTopologyPaths will
always return rack information (for example, Kosmos FS), this patch should handle that case
as well. 

> 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
>         Attachments: CombineMultiFile.patch
>
>
> 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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