Klaus Ma created MESOS-4967:
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Summary: Oversubscription for reservation
Key: MESOS-4967
URL: https://issues.apache.org/jira/browse/MESOS-4967
Project: Mesos
Issue Type: Epic
Components: master
Reporter: Klaus Ma
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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