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https://issues.apache.org/jira/browse/YARN-596?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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bc Wong updated YARN-596:
-------------------------
Description:
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.
was:
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.
> Use scheduling policies throughout the queue hierarchy to decide which
> containers to preempt
> --------------------------------------------------------------------------------------------
>
> 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: Wei Yan
> Fix For: 2.5.0
>
> Attachments: YARN-596.patch, YARN-596.patch, YARN-596.patch,
> YARN-596.patch, YARN-596.patch, YARN-596.patch, YARN-596.patch,
> YARN-596.patch, YARN-596.patch, YARN-596.patch, YARN-596.patch, YARN-596.patch
>
>
> 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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