[jira] [Created] (FLINK-12231) Introduce Scheduler interface and adapt ExecutionGraph to it

[Shang Yuanchun (Jira)]

Gary Yao created FLINK-12231:
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             Summary: Introduce Scheduler interface and adapt ExecutionGraph to it
                 Key: FLINK-12231
                 URL: https://issues.apache.org/jira/browse/FLINK-12231
             Project: Flink
          Issue Type: Bug
          Components: Runtime / Coordination
            Reporter: Gary Yao
            Assignee: Gary Yao


Introduce the {{Scheduler}} interface. The {{ExecutionGraph}} contains scheduling logic at the moment. We can use the adapter pattern to translate the _scheduling-relevant_ methods on the {{ExecutionGraph}} to the {{Scheduler}} interface.

Acceptance Criteria:
* {{JobMaster}} does not have a reference to the {{ExecutionGraph}}



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