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From "Vinod Kumar Vavilapalli (JIRA)" <j...@apache.org>
Subject [jira] [Resolved] (MAPREDUCE-5786) Support Keep-Alive connections in ShuffleHandler
Date Fri, 21 Mar 2014 21:46:51 GMT

     [ https://issues.apache.org/jira/browse/MAPREDUCE-5786?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

Vinod Kumar Vavilapalli resolved MAPREDUCE-5786.

    Resolution: Fixed

All sub-tasks  (only one actually) are done.

> Support Keep-Alive connections in ShuffleHandler
> ------------------------------------------------
>                 Key: MAPREDUCE-5786
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-5786
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>    Affects Versions: 2.4.0
>            Reporter: Rajesh Balamohan
>            Assignee: Rajesh Balamohan
>              Labels: shuffle
> Currently ShuffleHandler supports fetching map-outputs in batches from same host.  But
there are scenarios wherein, fetchers pull data aggressively (i.e start pulling the data as
& when they are available).  In this case, the number of mapIds that are pulled from same
host remains at 1. This causes lots of connections to be established.
> Number of connections can be reduced a lot if ShuffleHandler supports Keep-Alive.

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