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From "Tom White (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MAPREDUCE-5896) Allow InputSplits to indicate which locations have the block cached in memory
Date Mon, 26 May 2014 15:03:01 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-5896?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14008903#comment-14008903
] 

Tom White commented on MAPREDUCE-5896:
--------------------------------------

>From a compatibility point of view I think the changes are OK, although SplitLocationInfo
should not (yet) be marked as @Stable. Also, mapred.FileSplit has a new getSplitLocationInfo()
method, but it should be getLocationInfo(). Add an @Override annotation to catch this.

How would the split calculation in FileInputFormat change to use hosts with a cached copy
of a particular block? It would be worth creating a trial implementation to test that the
changes are sufficient. 

> Allow InputSplits to indicate which locations have the block cached in memory
> -----------------------------------------------------------------------------
>
>                 Key: MAPREDUCE-5896
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-5896
>             Project: Hadoop Map/Reduce
>          Issue Type: Improvement
>    Affects Versions: 2.4.0
>            Reporter: Sandy Ryza
>            Assignee: Sandy Ryza
>         Attachments: MAPREDUCE-5896.patch
>
>




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