[jira] [Commented] (FLINK-4391) Provide support for asynchronous operations over streams

["Robert Metzger (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/FLINK-4391?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15794719#comment-15794719 ] 

Robert Metzger commented on FLINK-4391:
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I could not find any documentation in f52830763d8f95a955c10265e2c3543a5890e719. What's the plan for documenting the feature?

> Provide support for asynchronous operations over streams
> --------------------------------------------------------
>
>                 Key: FLINK-4391
>                 URL: https://issues.apache.org/jira/browse/FLINK-4391
>             Project: Flink
>          Issue Type: New Feature
>          Components: DataStream API
>            Reporter: Jamie Grier
>            Assignee: david.wang
>             Fix For: 1.2.0
>
>
> Many Flink users need to do asynchronous processing driven by data from a DataStream.  The classic example would be joining against an external database in order to enrich a stream with extra information.
> It would be nice to add general support for this type of operation in the Flink API.  Ideally this could simply take the form of a new operator that manages async operations, keeps so many of them in flight, and then emits results to downstream operators as the async operations complete.



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