Sandy Ryza created YARN-596:
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Summary: In fair scheduler, intra-application container priorities
affect inter-application preemption decisions
Key: YARN-596
URL: https://issues.apache.org/jira/browse/YARN-596
Project: Hadoop YARN
Issue Type: Bug
Components: scheduler
Affects Versions: 2.0.3-alpha
Reporter: Sandy Ryza
Assignee: Sandy Ryza
In the fair scheduler, containers are chosen for preemption in the following
way:
All containers for all apps that are in queues that are over their fair share
are put in a list.
The list is sorted in order of the priority that the container was requested in.
This means that an application can shield itself from preemption by requesting
it's containers at higher priorities, which doesn't really make sense.
Also, an application that is not over its fair share, but that is in a queue
that is over it's fair share is just as likely to have containers preempted as
an application that is over its fair share.
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