[jira] [Commented] (YARN-8255) Allow option to disable flex for a service component

["Billie Rinaldi (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/YARN-8255?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16466268#comment-16466268 ] 

Billie Rinaldi commented on YARN-8255:
--------------------------------------

I'm not sure this configuration parameter is necessary. Only the launching user can flex the service, so this user should know whether flexing makes sense for components of their service. I am also not sure about having different defaults for different policies; it seems like this will be confusing and require complex documentation.

> Allow option to disable flex for a service component 
> -----------------------------------------------------
>
>                 Key: YARN-8255
>                 URL: https://issues.apache.org/jira/browse/YARN-8255
>             Project: Hadoop YARN
>          Issue Type: Bug
>          Components: yarn-native-services
>            Reporter: Suma Shivaprasad
>            Assignee: Suma Shivaprasad
>            Priority: Major
>
> YARN-8080 implements restart capabilities for service component instances. YARN service components should add an option to disallow flexing to support workloads which are essentially batch/iterative jobs which terminate with restart_policy=NEVER/ON_FAILURE. This could be disabled by default for components where restart_policy=NEVER/ON_FAILURE and enabled by default when restart_policy=ALWAYS(which is the default restart_policy) unless explicitly set at the service spec.
> The option could be exposed as part of the component spec as "allow_flexing". 
> cc [~billie.rinaldi] [~gsaha] [~eyang] [~csingh] [~wangda]



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