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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. -- This message was sent by Atlassian JIRA (v6.2#6252)