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https://issues.apache.org/jira/browse/YARN-1011?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13727582#comment-13727582
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Steve Loughran commented on YARN-1011:
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Feature creep: could we have a way to explicitly ask for speculative
containers? This could be useful in long-lived services; the equivalent of EC2
spot instances, where you can have a few for work if you understand that they
may be destroyed with no warning at all.
> [Umbrella] RM should dynamically schedule containers based on utilization of
> currently allocated containers
> -----------------------------------------------------------------------------------------------------------
>
> Key: YARN-1011
> URL: https://issues.apache.org/jira/browse/YARN-1011
> Project: Hadoop YARN
> Issue Type: New Feature
> Reporter: Arun C Murthy
>
> Currently RM allocates containers and assumes resources allocated are
> utilized.
> RM can, and should, get to a point where it measures utilization of allocated
> containers and, if appropriate, allocate more (speculative?) containers.
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