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Scott Chen commented on MAPREDUCE-2198: --------------------------------------- I tried using review board. But I always get 500 error. > Allow FairScheduler to control the number of slots on each TaskTracker > ---------------------------------------------------------------------- > > Key: MAPREDUCE-2198 > URL: https://issues.apache.org/jira/browse/MAPREDUCE-2198 > Project: Hadoop Map/Reduce > Issue Type: New Feature > Components: contrib/fair-share > Affects Versions: 0.23.0 > Reporter: Scott Chen > Assignee: Scott Chen > Fix For: 0.23.0 > > Attachments: MAPREDUCE-2198.txt > > > We can set the number of slots on the TaskTracker to be high and let > FairScheduler handles the slots. > This approach allows us to change the number of slots on each node > dynamically. > The administrator can change the number of slots with a CLI tool. > One use case of this is for upgrading the MapReduce. > Instead of restarting the cluster, we can run the new MapReduce on the same > cluster. > And use the CLI tool to gradually migrate the slots. > This way we don't lost the progress fo the jobs that's already executed. -- This message is automatically generated by JIRA. - You can reply to this email to add a comment to the issue online.