Benjamin Mahler created MESOS-2930:
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Summary: Allow the Resource Estimator to express over-allocation
of revocable resources.
Key: MESOS-2930
URL: https://issues.apache.org/jira/browse/MESOS-2930
Project: Mesos
Issue Type: Improvement
Components: slave
Reporter: Benjamin Mahler
Currently the resource estimator returns the amount of oversubscription
resources that are available, since resources cannot be negative, this allows
the resource estimator to express the following:
(1) Return empty resources: We are fully allocated for oversubscription
resources.
(2) Return non-empty resources: We are under-allocated for oversubscription
resources. In other words, some are available.
However, there is an additional situation that we cannot express:
(3) Analogous to returning non-empty "negative" resources: We are
over-allocated for oversubscription resources. Do not re-offer any of the
over-allocated oversubscription resources that are recovered.
Without (3), the slave can only shrink the total pool of oversubscription
resources by returning (1) as resources are recovered, until the pool is shrunk
to the desired size. However, this approach is only best-effort, it's possible
for a framework to launch more tasks in the window of time (15 seconds by
default) that the slave polls the estimator.
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