[jira] [Assigned] (YUNIKORN-2369) Using unique generated Application IDs breaks scheduling

["Craig Condit (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/YUNIKORN-2369?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Craig Condit reassigned YUNIKORN-2369:
--------------------------------------

    Assignee: Craig Condit

> Using unique generated Application IDs breaks scheduling
> --------------------------------------------------------
>
>                 Key: YUNIKORN-2369
>                 URL: https://issues.apache.org/jira/browse/YUNIKORN-2369
>             Project: Apache YuniKorn
>          Issue Type: Bug
>          Components: shim - kubernetes
>            Reporter: Craig Condit
>            Assignee: Craig Condit
>            Priority: Critical
>
> YUNIKORN-1273 added support to create unique application IDs instead of grouping pods within a given namespace into a single application. However, using this feature in combination with the YuniKorn admission controller results in a failure to accept pods, as the pod UID (used in the generated identifier) has not yet been created when admission controllers run.
> For example, given a pod UID of `deadbeefcafe` running in namespace `test`, the expected application ID is `test-deadbeefcafe`. However, since the pod UID is not present when the admission controller runs, this evaluates to `test-` and results in the pod being rejected by Kubernetes since labels must contain only alphanumeric characters plus `-`, and must start end end with alphanumeric characters.
> One way to solve this would be to set the applicationId label in the admission controller to something like `test-uniqueautogen` and then have the scheduler interpret the presence of the `-uniqueautogen` suffix as a request to use the pod UID as part of the name (since it will be available to the scheduler). This satisfies the original design of YUNIKORN-1273, which was to make the identifiers predictable (since they contain the pod UID), unique (as they still are UIDs) and consistent between restarts of the scheduler.



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