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https://issues.apache.org/jira/browse/YARN-6594?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16111595#comment-16111595
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Konstantinos Karanasos commented on YARN-6594:
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Thanks for the explanation, [~jianhe].
I see why key-value pairs will be needed to select containers. BTW when would
an AM want to select containers with specific attributes though? Like when you
are a service and want to update specific containers only?
Like you say, we could change the container tags to be key-value pairs. I was
trying to think of use cases that this would be really needed and I didn't find
many. For example, we could have {{memory_critical=high}} instead of just
{{memory-critical}}. But then the constraint API would get too complicated,
because we would need to teach people that they can have constraints where only
the key matters (as in "I want allocations that are memory_critical, no matter
the value") and others that the value matters too.
Adding they key-values in YARN-6593 is not hard, but I would suggest to keep it
as is for the first version.
For this JIRA, we can make the tags to be key-values, but only if we think it
is useful.
Another problem, like you say, is that the current tags refer to allocations,
while it seems that your key-value attributes would refer to containers.
Let me know what you guys think.
> [API] Introduce SchedulingRequest object
> ----------------------------------------
>
> Key: YARN-6594
> URL: https://issues.apache.org/jira/browse/YARN-6594
> Project: Hadoop YARN
> Issue Type: Sub-task
> Reporter: Konstantinos Karanasos
> Assignee: Konstantinos Karanasos
> Attachments: YARN-6594.001.patch
>
>
> This JIRA introduces a new SchedulingRequest object.
> It will be part of the {{AllocateRequest}} and will be used to define sizing
> (e.g., number of allocations, size of allocations) and placement constraints
> for allocations.
> Applications can use either this new object (when rich placement constraints
> are required) or the existing {{ResourceRequest}} object.
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