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Shrinivas Joshi commented on MAPREDUCE-4400: -------------------------------------------- As I said earlier, I did verify that this patch was working as expected. It does minimize synchronization over MR3809. This patch looks good to be committed to me. > Fix performance regression for small jobs/workflows > --------------------------------------------------- > > Key: MAPREDUCE-4400 > URL: https://issues.apache.org/jira/browse/MAPREDUCE-4400 > Project: Hadoop Map/Reduce > Issue Type: Bug > Components: task > Affects Versions: 0.20.203.0, 1.0.3 > Reporter: Luke Lu > Assignee: Luke Lu > Attachments: mapreduce-4400-branch-1.patch > > > There is a significant performance regression for small jobs/workflows (vs > 0.20.2) in the Hadoop 1.x series. Most noticeable with Hive and Pig jobs. > PigMix has an average 40% regression against 0.20.2. -- 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