[YARN-7424] Capacity Scheduler Intra-queue preemption: add property to only preempt up to configured MULP

• Type: Improvement
• Status: Resolved
• Priority: Major
• Resolution: Invalid
• Affects Version/s: 3.0.0-beta1, 2.8.2
• Component/s: capacity scheduler, scheduler preemption
• Assignee: Eric Payne
• Reporter: Eric Payne
• Created: 31/Oct/17 20:41
• Updated: 14/Oct/19 15:38
• Resolved: 10/Jan/18 17:18

Description

If the queue's configured minimum user limit percent (MULP) is something small like 1%, all users will max out well over their MULP until 100 users have apps in the queue. Since the intra-queue preemption monitor tries to balance the resource among the users, most of the time in this use case it will be preempting containers on behalf of users that are already over their MULP guarantee.

This JIRA proposes that a property should be provided so that a queue can be configured to only preempt on behalf of a user until that user has reached its MULP.