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https://issues.apache.org/jira/browse/YARN-7185?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16162152#comment-16162152
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Wangda Tan commented on YARN-7185:
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A simple fix for this issue in my mind is only do available resource check when
max opportunistic queue len configured to > 0. Please see attached ver.001
patch.
> ContainerScheduler should only look at availableResource for GUARANTEED
> containers when opportunistic scheduling is enabled
> ----------------------------------------------------------------------------------------------------------------------------
>
> Key: YARN-7185
> URL: https://issues.apache.org/jira/browse/YARN-7185
> Project: Hadoop YARN
> Issue Type: Bug
> Components: yarn
> Reporter: Sumana Sathish
> Assignee: Tan, Wangda
> Priority: Blocker
> Attachments: YARN-7185.001.patch
>
>
> Found an issue:
> When DefaultContainerCalculator is enabled and opportunistic container
> allocation is disabled. It is possible that for a NM:
> {code}
> Σ(allocated-container.vcores) > nm.configured-vores.
> {code}
> When this happens, ContainerScheduler will report errors like:
> bq. ContainerScheduler
> (ContainerScheduler.java:pickOpportunisticContainersToKill(458)) - There are
> no sufficient resources to start guaranteed.
> This will be an incompatible change after 2.8 because before YARN-6706, we
> can start containers when DefaultContainerCalculator is configured and vcores
> is overallocated.
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