[jira] [Created] (FLINK-2329) Refactor RPCs from within the ExecutionGraph

[Shang Yuanchun (Jira)]

Till Rohrmann created FLINK-2329:
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             Summary: Refactor RPCs from within the ExecutionGraph
                 Key: FLINK-2329
                 URL: https://issues.apache.org/jira/browse/FLINK-2329
             Project: Flink
          Issue Type: Sub-task
            Reporter: Till Rohrmann
            Assignee: Till Rohrmann


Currently, we store an {{ActorRef}} of the TaskManager into an {{Instance}} object. This {{ActorRef}} is used from within {{Executions}} to interact with the {{TaskManager}}. This is not a nice abstraction since it does not hide implementation details.

Since we need to add a leader session ID to messages sent by the {{Executions}} in order to support high availability, we would need to make the leader session ID available to the {{Execution}}. A better solution seems to be to replace the direct {{ActorRef}} interaction with an instance gateway abstraction which encapsulates the communication logic. Having such an abstraction, it will be easy to decorate messages transparently with a leader session ID. Therefore, I propose to refactor the current {{Instance}} communication and to introduce an {{InstanceGateway}} abstraction.



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