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Posted to issues@yunikorn.apache.org by "Weiwei Yang (Jira)" <ji...@apache.org> on 2021/07/21 05:41:00 UTC
[jira] [Assigned] (YUNIKORN-704) [Umbrella] Use the same mechanism
to schedule daemon set pods as the default scheduler
[ https://issues.apache.org/jira/browse/YUNIKORN-704?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Weiwei Yang reassigned YUNIKORN-704:
------------------------------------
Assignee: Ting Yao,Huang
> [Umbrella] Use the same mechanism to schedule daemon set pods as the default scheduler
> --------------------------------------------------------------------------------------
>
> Key: YUNIKORN-704
> URL: https://issues.apache.org/jira/browse/YUNIKORN-704
> Project: Apache YuniKorn
> Issue Type: Improvement
> Components: shim - kubernetes
> Reporter: Chaoran Yu
> Assignee: Ting Yao,Huang
> Priority: Blocker
> Fix For: 1.0.0
>
> Attachments: fluent-bit-describe.yaml, fluent-bit.yaml
>
>
> We sometimes see DaemonSet pods fail to be scheduled. Please see attached files for the YAML and _kubectl describe_ output of one such pod. We originally suspected [node reservation|https://github.com/apache/incubator-yunikorn-core/blob/v0.10.0/pkg/scheduler/context.go#L41] was to blame. But even after setting the DISABLE_RESERVATION environment variable to true, we still see such scheduling failures. The issue is especially severe when K8s nodes have disk pressure that causes lots of pods to be evicted. Newly created pods will stay in pending forever. We have to temporarily uninstall YuniKorn and let the default scheduler do the scheduling for these pods.
> This issue is critical because lots of important pods belong to a DaemonSet, such as Fluent Bit, a common logging solution. This is probably the last remaining roadblock for us to have the confidence to have YuniKorn entirely replace the default scheduler.
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