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Arun C Murthy commented on MAPREDUCE-1463: ------------------------------------------ -1 These knobs seem backwards - as both Todd and Amar have pointed out we could add heuristics to tweak mapreduce.job.reduce.slowstart.completedmaps automatically without adding more config knobs. > Reducer should start faster for smaller jobs > -------------------------------------------- > > Key: MAPREDUCE-1463 > URL: https://issues.apache.org/jira/browse/MAPREDUCE-1463 > Project: Hadoop Map/Reduce > Issue Type: Improvement > Components: contrib/fair-share > Reporter: Scott Chen > Assignee: Scott Chen > Attachments: MAPREDUCE-1463-v1.patch, MAPREDUCE-1463-v2.patch > > > Our users often complain about the slowness of smaller ad-hoc jobs. > The overhead to wait for the reducers to start in this case is significant. > It will be good if we can start the reducer sooner in this case. -- This message is automatically generated by JIRA. - You can reply to this email to add a comment to the issue online.