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From "Sandy Ryza (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-596) In fair scheduler, intra-application container priorities affect inter-application preemption decisions
Date Wed, 28 May 2014 05:12:04 GMT

    [ https://issues.apache.org/jira/browse/YARN-596?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14010791#comment-14010791
] 

Sandy Ryza commented on YARN-596:
---------------------------------

Thanks Wei.  Getting close - a few more comments.

{code}
+  private static final ResourceCalculator RESOURCE_CALCULATOR =
+      new DefaultResourceCalculator();
{code}
This is no longer needed in FSQueue, right?

FIFOPolicy should throw an unsupported operation exception if its checkIfUsageOverFairShare
is called.

fairshare should be fairShare

> 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
>         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
>
>
> 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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