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From "Benjamin Mahler (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MESOS-7136) Eliminate fair sharing between frameworks within a role.
Date Thu, 20 Apr 2017 01:21:04 GMT

    [ https://issues.apache.org/jira/browse/MESOS-7136?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15975879#comment-15975879
] 

Benjamin Mahler commented on MESOS-7136:
----------------------------------------

[~qianzhang] yes, the plan would be to remove the special casing of framework id as a pseudo-role,
so there would no longer be the additional sorters. To clarify what I meant by compete, the
resources would be offered to all participants within a role and the first one to take it
wins. If users wish to have constraints among frameworks using a role, they can use sub-roles
identifying their frameworks, which achieves the existing behavior. But, you also get the
added benefit of using actual roles, so you can change weights, set quota, etc.

> Eliminate fair sharing between frameworks within a role.
> --------------------------------------------------------
>
>                 Key: MESOS-7136
>                 URL: https://issues.apache.org/jira/browse/MESOS-7136
>             Project: Mesos
>          Issue Type: Epic
>          Components: allocation, technical debt
>            Reporter: Benjamin Mahler
>              Labels: multi-tenancy
>
> The current fair sharing algorithm performs fair sharing between frameworks within a
role. This is equivalent to having the framework id behave as a pseudo-role beneath the role.
Consider the case where there are two spark frameworks running within the same "spark" role.
This behaves similarly to hierarchical roles with the framework ID acting as an implicit role:
> {noformat}
>                          ^
>                        /   \
>                   spark     services
>                     ^
>                   /   \
>                 /       \
>     FrameworkId1         FrameworkId2
> (fixed weight of 1)    (fixed weight of 1)
> {noformat}
> Unfortunately, the frameworks cannot change their weight to be a value other than 1 (see
MESOS-6247) and they cannot set quota.
> With the addition of hierarchical roles (see MESOS-6375) we can eliminate the notion
of the framework ID acting as a pseudo-role in favor of explicitly using hierarchical roles.
E.g.
> {noformat}
>                          ^
>                        /   \
>                     eng    sales
>                     ^
>                   /   \
>          analytics     ui
>              ^
>            /   \
>    learning     reports
> {noformat}
> Here if two frameworks run within the eng/analytics role, then they will compete for
resources without fair sharing. However, if resource guarantees are required, sub-roles can
be created explicitly, e.g. eng/analytics/learning and eng/analytics/reports. These roles
can be given weights and quota.



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