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From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (FLINK-2405) Add stateful transformations using lambdas to the Streaming Scala API
Date Tue, 28 Jul 2015 08:34:05 GMT

    [ https://issues.apache.org/jira/browse/FLINK-2405?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14644062#comment-14644062
] 

ASF GitHub Bot commented on FLINK-2405:
---------------------------------------

Github user tillrohrmann commented on the pull request:

    https://github.com/apache/flink/pull/936#issuecomment-125503398
  
    I've got one remark before merging.


> Add stateful transformations using lambdas to the Streaming Scala API
> ---------------------------------------------------------------------
>
>                 Key: FLINK-2405
>                 URL: https://issues.apache.org/jira/browse/FLINK-2405
>             Project: Flink
>          Issue Type: New Feature
>          Components: Scala API, Streaming
>            Reporter: Gyula Fora
>            Assignee: Gyula Fora
>            Priority: Minor
>
> I propose to extend the Streaming Scala API methods (map, flatmap, filter etc) with versions
that take stateful functions as lambdas. This would allow for a nice functional way of defining
stateful transformations:
> Example:
> def mapWithState( fun: (I, Option[S]) => (O, Option[S]), stateByKey: Boolean = false)
> The stateByKey optional flag allows the user to partition the state by key when applied
on a KeyedDataStream.



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