Anubhav Dhoot commented on YARN-3920:

Thx [~asuresh] for review and commit!

> FairScheduler container reservation on a node should be configurable to limit 
> it to large containers
> ----------------------------------------------------------------------------------------------------
>                 Key: YARN-3920
>                 URL: https://issues.apache.org/jira/browse/YARN-3920
>             Project: Hadoop YARN
>          Issue Type: Improvement
>          Components: fairscheduler
>            Reporter: Anubhav Dhoot
>            Assignee: Anubhav Dhoot
>         Attachments: YARN-3920.004.patch, YARN-3920.004.patch, 
> YARN-3920.004.patch, YARN-3920.004.patch, YARN-3920.005.patch, 
> yARN-3920.001.patch, yARN-3920.002.patch, yARN-3920.003.patch
> Reserving a node for a container was designed for preventing large containers 
> from starvation from small requests that keep getting into a node. Today we 
> let this be used even for a small container request. This has a huge impact 
> on scheduling since we block other scheduling requests until that reservation 
> is fulfilled. We should make this configurable so its impact can be minimized 
> by limiting it for large container requests as originally intended. 

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