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https://issues.apache.org/jira/browse/TWILL-89?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14048681#comment-14048681
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Steve Loughran commented on TWILL-89:
-------------------------------------
Based on the Slider experience, we've found exposing a limited interface to the
AM -including one in which the runnable can generate a list of request/release
operations to be very effective
# isolates all operations of the AM from those you want to publish to the plugin
# the queue-based execution gives a good model/view separation
# it becomes fairly easy to mock the AM services for unit tests
> Supports running a TwillRunnable inside the AM
> ----------------------------------------------
>
> Key: TWILL-89
> URL: https://issues.apache.org/jira/browse/TWILL-89
> Project: Apache Twill
> Issue Type: New Feature
> Components: api, core, yarn
> Reporter: Terence Yim
>
> Currently minimum of 2 containers are always needed even for running simple
> application. It'd be good to support running a TwillRunnable directly inside
> the AM to minimize container usage.
> Also, it might be good that it's a special kind of TwillRunnable that also
> has capability to interact with AM, such as requesting new container or
> sending commands to other runnables.
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