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https://issues.apache.org/jira/browse/SLIDER-1046?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15094151#comment-15094151
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Steve Loughran commented on SLIDER-1046:
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We'd need some way of forgetting about a component, that is: removing it's role
status and all history. Certainly possible.
I'd like to separate this from any flex command, and have it restricted to a
component type with no instances; it'd be a purge of state without anything
else to worry about
> Provide option to permanently delete a component
> ------------------------------------------------
>
> Key: SLIDER-1046
> URL: https://issues.apache.org/jira/browse/SLIDER-1046
> Project: Slider
> Issue Type: New Feature
> Components: core
> Affects Versions: Slider 0.80, Slider 0.90.2
> Reporter: Manoj Samel
>
> Need ability to permanently remove a component from application (not just
> stop it).
> At present, once a component is added; it can only be stopped (using flex 0
> or setting yarn.instances = 0). The stopped component still remains in
> application history forever and can never be deleted from application
> configuration files.
> In following use case; it is required to remove the component permanently.
> The service has instances (a.k.a. components) provided per user.
> 1. When a new user is added, a new component is started for that user. The
> idea is not to bring the existing app / components down for existing users.
> Say first user "user1" joins and gets component named "user1". When "user2"
> joins, I add "user2" component to metainfo/appconfig/resource, redeploy the
> package and do a "slider upgrade". This keeps "user1" component running
> (don't want to bring down user1) and brings user2 component up.
> 2. When the user is decommissioned, its component should be decommissioned
> permanently without impacting other running components. Flex zero or upgrade
> with resource.json yarn.instance=0 for this component stops the component but
> it still remembers the component in history; which is not desired. With many
> users coming and going, there should be option to delete the decommissioned
> component and remove it from all configuration files i.e. it should be
> possible to remove this component from metainfo, appconfig and resource
> 3. As a separate but related ask, it should also be possible to reuse the
> removed components yarn.role.priority for existing component. Further, the
> existing component should not be restarted if already running if its role
> priority is changed. E.g. say a component with role priority 10 was deleted
> as part of implementation of #2. Now it should be possible to assign 10 to
> other running component without restarting. At present, if role priority of
> running components are changed; the components are redeployed as new
> containers - which will impact running users.
> Discussion for this thread can be found on dev mailing list.
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