Terence Yim created TWILL-224:
---------------------------------

             Summary: Have the Application Master even no active runnable 
instance is running
                 Key: TWILL-224
                 URL: https://issues.apache.org/jira/browse/TWILL-224
             Project: Apache Twill
          Issue Type: New Feature
            Reporter: Terence Yim


This behavior allows one to start only an AM and launch runnable instances in 
an adhoc fashion. In order to support this, these are the changes need to be 
made:

# Make it an optional behavior that needs to be turned on per application 
submission via {{TwillPreparer}}
# The AM won't complete itself when there is no runnable instance running 
(either all completed or none started are the same case).
# Allows changing runnable instance to 0.



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