Benjamin Mahler created MESOS-6940:
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Summary: Do not send offers to MULTI_ROLE schedulers if agent does
not have MULTI_ROLE capability.
Key: MESOS-6940
URL: https://issues.apache.org/jira/browse/MESOS-6940
Project: Mesos
Issue Type: Task
Components: allocation, master
Reporter: Benjamin Mahler
Old agents that do not have the MULTI_ROLE capability cannot correctly receive
tasks from schedulers that have the MULTI_ROLE capability *and are using
multiple roles*. In this case, we should not send the offer to the scheduler,
rather than sending an offer but rejecting the scheduler's operations.
Note also that since we allow a single role scheduler to upgrade into having
the MULTI_ROLE capability (use of the {{FrameworkInfo.roles}} field) so long as
they continue to use a single role (in phase 1 of multi-role support the roles
cannot be changed), we could continue sending offers if the scheduler is
MULTI_ROLE capable but only uses a single role.
In phase 2 of multi-role support, we cannot safely allow a MULTI_ROLE scheduler
to receive resources from a non-MULTI_ROLE agent, so it seems we should simply
disallow MULTI_ROLE schedulers from receiving offers from non-MULTI_ROLE
agents, regardless of how many roles the scheduler is using.
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