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https://issues.apache.org/jira/browse/YARN-7839?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Arun Suresh updated YARN-7839:
------------------------------
    Summary: Modify PlacementAlgorithm to Check node capacity before placing 
request on node  (was: Check node capacity before placing in the Algorithm)

> Modify PlacementAlgorithm to Check node capacity before placing request on 
> node
> -------------------------------------------------------------------------------
>
>                 Key: YARN-7839
>                 URL: https://issues.apache.org/jira/browse/YARN-7839
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>            Reporter: Arun Suresh
>            Assignee: Panagiotis Garefalakis
>            Priority: Major
>         Attachments: YARN-7839-YARN-6592.001.patch
>
>
> Currently, the Algorithm assigns a node to a request purely based on if the 
> constraints are met. It is later in the scheduling phase that the Queue 
> capacity and Node capacity are checked. If the request cannot be placed 
> because of unavailable Queue/Node capacity, the request is retried by the 
> Algorithm.
> For clusters that are running at high utilization, we can reduce the retries 
> if we perform the Node capacity check in the Algorithm as well. The Queue 
> capacity check and the other user limit checks can still be handled by the 
> scheduler (since queues and other limits are tied to the scheduler, and not 
> scheduler agnostic)



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