[MESOS-8293] Reservation may not be allocated when the role has no quota.

• Type: Bug
• Status: Resolved
• Priority: Critical
• Resolution: Fixed
• Fix Version/s: 1.4.2, 1.5.0
• Component/s: allocation
• Labels: multitenancy
• Target Version/s: 1.4.2
• Sprint: Mesosphere Sprint 70
• Story Points: 3
• Assignee: Meng Zhu
• Reporter: Meng Zhu
• Shepherd: Benjamin Mahler
• Created: 01/Dec/17 23:44
• Updated: 03/May/18 00:01
• Resolved: 16/Dec/17 02:26

Description

Reservations that belong to a role that has no quota may not be allocated even when the reserved resources are allocatable to the role.

This is because in the current implementation the reserved resources may be counted towards the headroom left for unallocated quota limit in the second stage allocation.

https://github.com/apache/mesos/blob/c844db9ac7c0cef59be87438c6781bfb71adcc42/src/master/allocator/mesos/hierarchical.cpp#L1764-L1767

Roles with quota do not have this issue because currently their reservations are taken care of in the first stage.