[jira] [Assigned] (MESOS-6940) Do not send offers to MULTI_ROLE schedulers if agent does not have MULTI_ROLE capability.

["Jay Guo (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/MESOS-6940?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Jay Guo reassigned MESOS-6940:
------------------------------

    Assignee: Jay Guo

> 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
>            Assignee: Jay Guo
>
> 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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