Prateek Maheshwari created SAMZA-1745:
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             Summary: Remove usages of StreamSpec and ApplicationRunner from 
the OperatorSpec and OperatorImpl layers.
                 Key: SAMZA-1745
                 URL: https://issues.apache.org/jira/browse/SAMZA-1745
             Project: Samza
          Issue Type: Improvement
            Reporter: Prateek Maheshwari


Removes all usages of StreamSpec and ApplicationRunner from the OperatorSpec 
and OperatorImpl layers. DAG specification (StreamGraphSpec, OperatorSpecs) 
should only relies on logical streamIds (and in future, will use the 
user-provided StreamDescriptors). DAG execution (i.e., StreamOperatorTask, 
OperatorImpls) should only relies on logical streamIds and their corresponding 
SystemStreams, which can be obtained using StreamConfig in OperatorImplGraph.



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