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https://issues.apache.org/jira/browse/FLINK-4859?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Aljoscha Krettek updated FLINK-4859:
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    Priority: Critical  (was: Blocker)

> 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: Critical
>
> 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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