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