[jira] [Created] (FLINK-4859) Clearly Separate Responsibilities of StreamOperator and StreamTask

[Shang Yuanchun (Jira)]

Aljoscha Krettek created FLINK-4859:
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             Summary: Clearly Separate Responsibilities of StreamOperator and StreamTask
                 Key: FLINK-4859
                 URL: https://issues.apache.org/jira/browse/FLINK-4859
             Project: Flink
          Issue Type: Improvement
          Components: Streaming
            Reporter: Aljoscha Krettek
            Priority: Blocker


Currently, {{StreamTask}} and {{StreamOperator}} perform a complicated dance for certain operations. For example, when restoring from a snapshot, the state backends are restored in the {{StreamTask}}, but only after {{StreamTask}} calls restore on the operator and the operator asks for the backends. There is no clear separation/modularisation with properly defined interfaces right now.

The code works right now but maintainability/understandability could be greatly improved.



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