[jira] [Commented] (MESOS-6854) Prevent launching MULTI_ROLE framework's tasks on agents without MULTI_ROLE support.

["Guangya Liu (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/MESOS-6854?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15801371#comment-15801371 ] 

Guangya Liu commented on MESOS-6854:
------------------------------------

[~bmahler] , one question for this is for master side guard, if the master cannot get the agent capability, how can it do the validation? So seems we need first finish agent part first?

> Prevent launching MULTI_ROLE framework's tasks on agents without MULTI_ROLE support.
> ------------------------------------------------------------------------------------
>
>                 Key: MESOS-6854
>                 URL: https://issues.apache.org/jira/browse/MESOS-6854
>             Project: Mesos
>          Issue Type: Task
>          Components: agent, master
>            Reporter: Benjamin Mahler
>            Assignee: Guangya Liu
>
> The proposal for upgrades / backwards compatibility in phase 1 of multi-role framework support is that we require that masters and agents are all upgraded before a multi-role framework registers.
> We need to explicitly protect against this situation occurring given it's common for old agents to show up in a cluster. The master can prevent the launching of MULTI_ROLE frameworks' tasks on agent without MULTI_ROLE framework support.
> If we were to naively let this happen the old agent would think the resources are allocated to the "*" and there would need to be master logic to deal with the old agent not populating Resource.AllocationInfo.
> The guard will either need to be version based or agent capability based, the latter seeming like the stronger approach given some users upgrade off of master rather than using release versions.
> We can initially start with the master side guard, and have the agent send the capability once the agent-side implementation is complete.



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