Benjamin Mahler created MESOS-5528:
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Summary: Use inverse offers to reclaim resources from schedulers
over their quota.
Key: MESOS-5528
URL: https://issues.apache.org/jira/browse/MESOS-5528
Project: Mesos
Issue Type: Epic
Components: allocation
Reporter: Benjamin Mahler
As we move towards distinguishing non-revocable and revocable allocation of
resources, we need to enforce that the upper limits specified via quota are
enforced.
For example, if a scheduler has quota for non-revocable resources and there is
only fair sharing turned on for revocable resources, the scheduler should not
be able to consume more non-revocable resources than its quota limit.
Even if mesos disallows this when tasks are launched, there are cases where the
scheduler can exceed its quota:
* Unreachable nodes that were not accounted for reconnect to the cluster with
existing resources allocated to the scheduler's role.
* The operator lowers the amount of quota for the role.
In these cases and more generally, we need an always running mechanism for
reclaiming excess quota allocation via inverse offers. The deadline should be
configurable by the operator.
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