[jira] [Commented] (YARN-10103) Capacity scheduler: add support for create=true/false per mapping rule

["Peter Bacsko (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/YARN-10103?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17229191#comment-17229191 ] 

Peter Bacsko commented on YARN-10103:
-------------------------------------

I'm about to close this Jira for the following reasons:

1) "create" will be introduced in the new placement engine (YARN-10370). Let's leave the existing codebase and format alone which is already hard to read.

2) We will come up with a new approach to create dynamic queues anywhere, pretty much like in FS. Not sure if there's an upstream ticket yet, but soon we'll create one.

cc [~snemeth]

> Capacity scheduler: add support for create=true/false per mapping rule
> ----------------------------------------------------------------------
>
>                 Key: YARN-10103
>                 URL: https://issues.apache.org/jira/browse/YARN-10103
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>            Reporter: Peter Bacsko
>            Priority: Major
>              Labels: fs2cs
>
> You can't ask Capacity Scheduler for a mapping to create a queue if it doesn't exist.
> For example, this mapping would use the first rule if the queue exist. If it doesn't, then it proceeds to the next rule:
>  {{u:%user:%primary_group.%user:create=false;u:%user%:root.default}}
> Let's say user "alice" belongs to the "admins" group. It would first try to map {{root.admins.alice}}. But, if the queue doesn't exist, then it places the application into {{root.default}}.



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