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https://issues.apache.org/jira/browse/MESOS-4967?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Klaus Ma updated MESOS-4967:
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Assignee: (was: Klaus Ma)
> Oversubscription for reservation
> --------------------------------
>
> Key: MESOS-4967
> URL: https://issues.apache.org/jira/browse/MESOS-4967
> Project: Mesos
> Issue Type: Epic
> Components: allocation, framework, master
> Reporter: Klaus Ma
> Labels: IBM, mesosphere
>
> Reserved resources allow frameworks and cluster operators to ensure
> sufficient resources are available when needed. Reservations are usually
> made to guarantee there are enough resources under peak loads. Often times,
> reserved resources are not actually allocated; in other words, the frameworks
> do not use those resources and they sit reserved, but idle.
> This underutilization is either an opportunity cost or a direct cost,
> particularly to the cluster operator. Reserved but unallocated resources
> held by a Lender Framework could be optimistically offered to other
> frameworks, which we refer to as Tenant Frameworks. When the resources are
> requested back by the Lender Framework, some of the Tenant Frameworkâs tasks
> are evicted and the original resource offer guarantee is preserved.
> The first step is to identify when resources are reserved, but not allocated.
> We then offer these reserved resources to other frameworks, but mark these
> offered resources as revocable resources. This allows Tenant Frameworks to
> use these resources temporarily in a 'best-effort' fashion, knowing that they
> could be revoked or reclaimed at any time.
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