[jira] [Created] (FLINK-7157) Provide support for asynchronous operations over connected streams

["Pedro Miguel Rainho Chaves (JIRA)" <ji...@apache.org>]

Pedro Miguel Rainho Chaves created FLINK-7157:
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             Summary: Provide support for asynchronous operations over connected streams
                 Key: FLINK-7157
                 URL: https://issues.apache.org/jira/browse/FLINK-7157
             Project: Flink
          Issue Type: New Feature
          Components: DataStream API
            Reporter: Pedro Miguel Rainho Chaves


The asynchronous function provides a great way to process events in parallel, which can greatly increase the throughput. However, a user may want to process events in parallel based on a stored state created by another stream. For instance, one could have a stream of scripts (e.g. groovy scripts) and a stream of events. Processing the events by the scripts in a CoFlatMap greatly reduces the performance if those take a long time to execute, specially in cases with a high number of scripts. 

One could argue that increasing the parallelism of the CoFlatMap would solve the problem, however it would come at a very high resource cost. 

It would be nice to have a *CoAsyncFunction* which would allow one of the streams in a *connectedStream* to be processed in an asynchronous fashion. 






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