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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