Eric Payne created YARN-10613:
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Summary: Config to allow Intra-queue preemption to enable/disable
conservativeDRF
Key: YARN-10613
URL: https://issues.apache.org/jira/browse/YARN-10613
Project: Hadoop YARN
Issue Type: Improvement
Components: capacity scheduler, scheduler preemption
Affects Versions: 2.10.1, 3.1.4, 3.2.2, 3.3.0
Reporter: Eric Payne
Assignee: Eric Payne
YARN-8292 added code that prevents CS intra-queue preemption from preempting
containers from an app unless all of the major resources used by the app are
greater than the user limit for that user.
Ex:
| Used | User Limit |
| <58GB, 58> | <30GB, 300> |
In this example, only used memory is above the user limit, not used vcores. So,
intra-queue preemption will not occur.
YARN-8292 added the {{conservativeDRF}} flag to
{{CapacitySchedulerPreemptionUtils#tryPreemptContainerAndDeductResToObtain}}.
If {{conservativeDRF}} is false, containers will be preempted from apps in the
example state. If true, containers will not be preempted.
This flag is hard-coded to false for Inter-queue (cross-queue) preemption and
true for intra-queue (in-queue) preemption.
I propose that in some cases, we want intra-queue preemption to be more
aggressive and preempt in the example case. To accommodate that, I propose the
addition of the following config property:
{code:xml}
<property>
<name>yarn.resourcemanager.monitor.capacity.preemption.intra-queue-preemption.conservative-drf</name>
<value>true</value>
</property>
{code}
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