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

[Shang Yuanchun (Jira)]

Jamie Grier created FLINK-4391:
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             Summary: 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


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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