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https://issues.apache.org/jira/browse/YARN-2009?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15514405#comment-15514405
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Wangda Tan commented on YARN-2009:
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Hi [~eepayne],
bq. If Queue1 has 100 resources, and if user1 starts app1 at priority 1 that
consumes the whole queue, won't user1's user-limit-resource be 100? Then, if
user1 starts another app (app2) at priority 2, won't the above algorithm skip
over app2 because user1 has already achieved its user-limit-resource?
For your concern, I previously mentioned in the pseudo code:
{code}
// initial all value to 0
Map<String, Resource> user-to-allocated;
{code}
Initially user-to-allocated is set to 0, and when we loop applications, we will
go to app2 first, so app2's ideal-allocation becomes 100 and app1's
ideal-allocation will be updated to 0. (Assume app2 has >= 100 pending
resource).
Plz let me know if I missed anything.
Thanks,
> Priority support for preemption in ProportionalCapacityPreemptionPolicy
> -----------------------------------------------------------------------
>
> Key: YARN-2009
> URL: https://issues.apache.org/jira/browse/YARN-2009
> Project: Hadoop YARN
> Issue Type: Sub-task
> Components: capacityscheduler
> Reporter: Devaraj K
> Assignee: Sunil G
> Attachments: YARN-2009.0001.patch, YARN-2009.0002.patch
>
>
> While preempting containers based on the queue ideal assignment, we may need
> to consider preempting the low priority application containers first.
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