Benjamin Mahler created MESOS-5526:
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Summary: Allow schedulers to revoke resources to obtain their
quota or fair share.
Key: MESOS-5526
URL: https://issues.apache.org/jira/browse/MESOS-5526
Project: Mesos
Issue Type: Epic
Components: allocation
Reporter: Benjamin Mahler
In order to ensure fairness and quota guarantees are met in a dynamic cluster,
we need to ensure that schedulers can revoke existing revocable allocations in
order to obtain their fair share or their quota. Otherwise, schedulers must
wait (potentially forever!) until existing allocations are freed. This is a
policy that completely favors work conservation, in favor of meeting the
fairness and quota guarantees in a bounded amount of time.
As we expose resource constraints to schedulers (MESOS-5524), they will be able
to determine when Mesos will allow them to revoke resources. For example:
* If a scheduler is below its fair share, the scheduler may revoke existing
revocable resources that are offered to it.
* If a scheduler is below its quota, it can revoke existing revocable resources
in order to consume it for quota in a non-revocable manner.
This is orthogonal to optimistic or pessimistic allocation, in that either
approaches need to allow the schedulers to perform revocation in this manner.
In the pessimistic approach, we may confine what the scheduler can revoke, and
in an optimistic approach, we may provide more choice to the scheduler.
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