[YARN-1707] Making the CapacityScheduler more dynamic

• Type: Sub-task
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 2.6.0
• Component/s: capacityscheduler
• Labels: capacity-scheduler
• Hadoop Flags: Reviewed
• Assignee: Carlo Curino
• Reporter: Carlo Curino
• Created: 11/Feb/14 00:44
• Updated: 01/Dec/14 03:08
• Resolved: 12/Sep/14 23:47

Description

The CapacityScheduler is a rather static at the moment, and refreshqueue provides a rather heavy-handed way to reconfigure it. Moving towards long-running services (tracked in YARN-896) and to enable more advanced admission control and resource parcelling we need to make the CapacityScheduler more dynamic. This is instrumental to the umbrella jira YARN-1051.

Concretely this require the following changes:

• create queues dynamically
• destroy queues dynamically
• dynamically change queue parameters (e.g., capacity)
• modify refreshqueue validation to enforce sum(child.getCapacity())<= 100% instead of ==100%

We limit this to LeafQueues.

Issue Links

• blocks: YARN-1712 Admission Control: plan follower
• depends upon: YARN-2378 Adding support for moving apps between queues in Capacity Scheduler
• is part of: YARN-1051 YARN Admission Control/Planner: enhancing the resource allocation model with time.