ASF GitHub Bot commented on FLINK-4391:

Github user bjlovegithub commented on the issue:

    Update the PR based on the latest review.

> 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
> 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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