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https://issues.apache.org/jira/browse/YARN-9697?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16962868#comment-16962868
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Abhishek Modi commented on YARN-9697:
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Filed YARN-9941 for fixing Opportunistic scheduler metrics during fail-over.
> Efficient allocation of Opportunistic containers.
> -------------------------------------------------
>
> Key: YARN-9697
> URL: https://issues.apache.org/jira/browse/YARN-9697
> Project: Hadoop YARN
> Issue Type: Sub-task
> Reporter: Abhishek Modi
> Assignee: Abhishek Modi
> Priority: Major
> Attachments: YARN-9697.001.patch, YARN-9697.002.patch,
> YARN-9697.003.patch, YARN-9697.004.patch, YARN-9697.005.patch,
> YARN-9697.006.patch, YARN-9697.007.patch, YARN-9697.008.patch,
> YARN-9697.ut.patch, YARN-9697.ut2.patch, YARN-9697.wip1.patch,
> YARN-9697.wip2.patch
>
>
> In the current implementation, opportunistic containers are allocated based
> on the number of queued opportunistic container information received in node
> heartbeat. This information becomes stale as soon as more opportunistic
> containers are allocated on that node.
> Allocation of opportunistic containers happens on the same heartbeat in which
> AM asks for the containers. When multiple applications request for
> Opportunistic containers, containers might get allocated on the same set of
> nodes as already allocated containers on the node are not considered while
> serving requests from different applications. This can lead to uneven
> allocation of Opportunistic containers across the cluster leading to
> increased queuing time
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