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https://issues.apache.org/jira/browse/YARN-1197?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14561573#comment-14561573
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Wangda Tan commented on YARN-1197:
----------------------------------

[~mding].
For the comparison of resources, I think for both increase/decrease, it should 
be >= or <= for all dimensions. But if resource calculator is default, increase 
v-core makes no sense. So I think ResourceCalculator has to be used, but also 
needs to check all individual dimensions.

So the logic will be:
{code}
if (increase): 
   delta = target - now
   if delta.mem < 0 || delta.vcore < 0:
      throw exception
   if resourceCalculator.lessOrEqualThan(delta, 0):
      throw exception
   // .. move forward
{code}

> Support changing resources of an allocated container
> ----------------------------------------------------
>
>                 Key: YARN-1197
>                 URL: https://issues.apache.org/jira/browse/YARN-1197
>             Project: Hadoop YARN
>          Issue Type: Task
>          Components: api, nodemanager, resourcemanager
>    Affects Versions: 2.1.0-beta
>            Reporter: Wangda Tan
>         Attachments: YARN-1197_Design.pdf, mapreduce-project.patch.ver.1, 
> tools-project.patch.ver.1, yarn-1197-scheduler-v1.pdf, yarn-1197-v2.pdf, 
> yarn-1197-v3.pdf, yarn-1197-v4.pdf, yarn-1197-v5.pdf, yarn-1197.pdf, 
> yarn-api-protocol.patch.ver.1, yarn-pb-impl.patch.ver.1, 
> yarn-server-common.patch.ver.1, yarn-server-nodemanager.patch.ver.1, 
> yarn-server-resourcemanager.patch.ver.1
>
>
> The current YARN resource management logic assumes resource allocated to a 
> container is fixed during the lifetime of it. When users want to change a 
> resource 
> of an allocated container the only way is releasing it and allocating a new 
> container with expected size.
> Allowing run-time changing resources of an allocated container will give us 
> better control of resource usage in application side



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