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Posted to issues@flink.apache.org by "Aljoscha Krettek (JIRA)" <ji...@apache.org> on 2017/04/03 12:13:42 UTC

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

     [ https://issues.apache.org/jira/browse/FLINK-4859?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Aljoscha Krettek updated FLINK-4859:
------------------------------------
    Component/s:     (was: Streaming)
                 DataStream API

> 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: DataStream API
>            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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