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Posted to mapreduce-issues@hadoop.apache.org by "Vinod Kumar Vavilapalli (JIRA)" <ji...@apache.org> on 2014/03/21 22:46:51 UTC
[jira] [Resolved] (MAPREDUCE-5786) Support Keep-Alive connections
in ShuffleHandler
[ 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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