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https://issues.apache.org/jira/browse/FLINK-2279?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Gyula Fora resolved FLINK-2279.
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Resolution: Fixed
> Allow treating iteration head as ConnectedDataStream
> -----------------------------------------------------
>
> Key: FLINK-2279
> URL: https://issues.apache.org/jira/browse/FLINK-2279
> Project: Flink
> Issue Type: New Feature
> Components: Streaming
> Affects Versions: 0.10
> Reporter: Gyula Fora
> Assignee: Gyula Fora
> Priority: Minor
>
> Currently the streaming iterations are restricted to use the same input and
> feedback types which are routed through the same operator.
> This means that if the user want to distinguish between normal input and
> feedback record he/she needs to mark it somehow and also a wrapper type is
> necessary for handling separate input and feedback types.
> This makes implementing iterative algorithms (such as ML) quite ugly at some
> points.
> I propose to let the user treat the normal input if the iteration head
> operator and the feedback input as a ConnectedDataStream which can be used to
> apply co-operators both distinguishing the inputs and allowing different
> feedback types for elegant implementations.
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