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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