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https://issues.apache.org/jira/browse/YARN-5085?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15294033#comment-15294033
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Konstantinos Karanasos commented on YARN-5085:
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[~kasha], some more thoughts about the important points you brought up...
bq. Shouldn't the latter be solely at the discretion of RM/NM ensemble
I think the AM should always be able to request a change in the ExecutionType
of its containers. This should be the case for containers at any stage of their
execution, like [~asuresh] mentions.
Later, we might want to explore the "automatic" ExecutionType change by the
NM/RM, as you mention, but that should not block us from explicitly asking for
it through the AM.
bq. I see the need for a promotion, why would we want to demote?
I think it is better to keep the API more general in case we introduce more
container types, especially if those don't have a strict hierarchy. As an
example, we could have preemptable and non-preemptable OPPORTUNISTIC
containers. In this case, we might want to change across container types, but
that would not be a clear promotion.
However, I agree that we should initially disallow changing container type from
GUARANTEED to OPPORTUNISTIC, as it is not clear what the behavior of such a
change would be.
Makes sense?
> Add support for change of container ExecutionType
> -------------------------------------------------
>
> Key: YARN-5085
> URL: https://issues.apache.org/jira/browse/YARN-5085
> Project: Hadoop YARN
> Issue Type: Bug
> Reporter: Arun Suresh
> Assignee: Arun Suresh
>
> YARN-2882 introduced the concept of {{ExecutionType}} for containers and it
> also introduced the concept of OPPORTUNISTIC ExecutionType.
> YARN-4335 introduced changes to the ResourceRequest so that AMs may request
> that the Container allocated against the ResourceRequest is of a particular
> {{ExecutionType}}.
> This JIRA proposes to provide support for the AM to change the ExecutionType
> of a previously requested Container.
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