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Posted to issues@flink.apache.org by "Stephan Ewen (JIRA)" <ji...@apache.org> on 2018/07/04 20:54:00 UTC

[jira] [Commented] (FLINK-6239) Sharing of State Across Operators

    [ https://issues.apache.org/jira/browse/FLINK-6239?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16533055#comment-16533055 ] 

Stephan Ewen commented on FLINK-6239:
-------------------------------------

Can you explain more how you expect this to work? Specifically:

  - Would all operators among which this is shared have read and write access?
  - Or will there be one "owner" that writes the state and other operators that can read the state.
  - What would the consistency model behind this be?

> Sharing of State Across Operators
> ---------------------------------
>
>                 Key: FLINK-6239
>                 URL: https://issues.apache.org/jira/browse/FLINK-6239
>             Project: Flink
>          Issue Type: Improvement
>          Components: DataStream API
>    Affects Versions: 1.1.4
>            Reporter: Elias Levy
>            Priority: Major
>
> Currently state cannot be shared across operators.  On a keyed stream, the state is implicitly keyed by the operator id, in addition to the stream key.  This can make it more difficult and inefficient to implement complex topologies, where multiple operator may need to access the same state.  It would be value to be able to access keyed value and map stated across operators.



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