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Suresh Srinivas resolved MAPREDUCE-4399. ---------------------------------------- Resolution: Fixed Hadoop Flags: Reviewed I committed the patch to branch-1 and for 1.1.0. Thank you Luke for the patch. Thank you John Poelman and Shreyas Subramanya for noticing the issue and verifying the fix. > Fix performance regression in shuffle > -------------------------------------- > > Key: MAPREDUCE-4399 > URL: https://issues.apache.org/jira/browse/MAPREDUCE-4399 > Project: Hadoop Map/Reduce > Issue Type: Bug > Components: performance, tasktracker > Affects Versions: 0.20.203.0, 1.0.3 > Reporter: Luke Lu > Assignee: Luke Lu > Attachments: mapreduce-4399-branch-1.patch > > > There is a significant (up to 3x) performance regression in shuffle (vs > 0.20.2) in the Hadoop 1.x series. Most noticeable with high-end switches. -- This message is automatically generated by JIRA. If you think it was sent incorrectly, please contact your JIRA administrators: https://issues.apache.org/jira/secure/ContactAdministrators!default.jspa For more information on JIRA, see: http://www.atlassian.com/software/jira