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https://issues.apache.org/jira/browse/MESOS-4892?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15233136#comment-15233136
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Anindya Sinha commented on MESOS-4892:
--------------------------------------
https://reviews.apache.org/r/45958/
https://reviews.apache.org/r/45959/
> Support arithmetic operations for shared resources with consumer counts
> -----------------------------------------------------------------------
>
> Key: MESOS-4892
> URL: https://issues.apache.org/jira/browse/MESOS-4892
> Project: Mesos
> Issue Type: Improvement
> Components: general
> Reporter: Anindya Sinha
> Assignee: Anindya Sinha
> Labels: external-volum, persistent-volumes, resource
>
> With the introduction of shared resources, we need to add support for
> arithmetic operations on Resources which perform such operations on shared
> resources. Shared resources need to be handled differently so as to account
> for incrementing/decrementing consumer counts maintained by each Resources
> object.
> Case 1:
> Resources total += shared_resource;
> If shared_resource exists in total, this would imply that the consumer count
> is incremented. If shared_resource does not exist in total, this would imply
> we start tracking consumers for this shared resource initialized to 0
> consumers.
> Case 2
> Resources total -= shared_resource;
> If shared_resource exists in total, this would imply that the consumer count
> is decremented. However, the shared_resource is removed from total if the
> consumer count is originally 0 in total).
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