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https://issues.apache.org/jira/browse/MAPREDUCE-2198?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12934753#action_12934753
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Joydeep Sen Sarma commented on MAPREDUCE-2198:
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what is fairscheduler specific about this? could we not make this a change in
the JT directly to scale the slots advertised by TT?
in addition - one bug/feature that we need to fix as part of this where the JT
overschedules TTs (when configured to schedule multiple tasks per hbt). this is
benign today (TT puts those tasks in unassigned state) - but in this world will
not be so benign.
> 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: 0.22.0
> Reporter: Scott Chen
> Assignee: Scott Chen
> Fix For: 0.22.0
>
>
> 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.
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