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https://issues.apache.org/jira/browse/YUNIKORN-1921?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17755441#comment-17755441
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PoAn Yang commented on YUNIKORN-1921:
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Not sure whether my answer is correct. Just sharing some thoughts. I assume all
workloads (except the control plane) are scheduled by Yunikorn. Although there
is no PriorityClass on placeholder pods, the yunikorn-core schedules the
highest priority application first.
For gang scheduling, we have to use FIFO sorting policy[1]. Also, we sort
applications by priority by default[2]. In this case, we will call
{{sortApplicationsByPriorityAndSubmissionTime}} in {{{}sortApplications{}}}[3],
so the system will sort applications by priority first and then by submission
time.
[~mpoland], if you can share your config and workload YAML, I can help to debug.
[~wilfreds], could you take a look for this comment? Not sure whether I miss
anything. Thank you.
[1]
[https://yunikorn.apache.org/docs/next/user_guide/gang_scheduling#why-the-fifo-sorting-policy]
[2]
[https://yunikorn.apache.org/docs/next/user_guide/queue_config#applicationsortpriority]
[3]
[https://github.com/apache/yunikorn-core/blob/a4b2ebb5748ac62a8b4ce3e8e6258dc7223e8eb8/pkg/scheduler/objects/sorters.go#L112]
> Gang Scheduled Placeholder Pods Don't Inherit PriorityClasses
> -------------------------------------------------------------
>
> Key: YUNIKORN-1921
> URL: https://issues.apache.org/jira/browse/YUNIKORN-1921
> Project: Apache YuniKorn
> Issue Type: Bug
> Reporter: Matt Poland
> Priority: Major
>
> While testing Yunikorn's gang scheduling feature, we noticed that placeholder
> pods do not inherit the PriorityClass defined for their associated pods
> awaiting scheduling.
> The placeholder pods are assigned a priority of 0 instead. This can affect
> jobs that are assigned a higher priority when they arrive around the same
> time as those of lower priority.
> Are there any plans to remedy this issue?
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