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https://issues.apache.org/jira/browse/MAPREDUCE-2198?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12934931#action_12934931
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Arun C Murthy commented on MAPREDUCE-2198:
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bq. Right now if you want to change the number of slots, you have to change the
conf on every TT and restart.
How do you handle heterogeneous clusters? Or will your CLI command be per TT?
Also, as Joydeep pointed out there are several issues with unassigned slots in
TTs...
> 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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