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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