[MESOS-9802] Remove quota role sorter in the allocator.

• Type: Improvement
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 1.9.0
• Component/s: allocation
• Labels: resource-management
• Sprint: Resource Mgmt: RI14 Sp 47
• Story Points: 2
• Assignee: Meng Zhu
• Reporter: Meng Zhu
• Created: 29/May/19 10:31
• Updated: 03/Jun/19 04:34
• Resolved: 03/Jun/19 04:34

Description

Remove the dedicated quota role sorter in favor of using the same sorting between satisfying guarantees and bursting above guarantees up to limits. This is tech debt from when a "quota role" was considered different from a "non-quota" role. However, they are the same, one just has a default quota.

The only practical difference between quota role sorter and role sorter now is that quota role sorter ignores the revocable resources both in its total resource pool as well as role allocations. Thus when using DRF, it does not count revocable resources which is arguably the right behavior.

By removing the quota sorter, we will have all roles sorted together. When using DRF, in the 1st quota guarantee allocation stage, its share calculation will also include revocable resources.