[Akka-Stream] How to let the groupBy operator without limited substreams?

Currently the groupBy operator need to set max substreams, but the application is streaming application , I can’t get the number of max substreams.

Hi @mggger,

At the risk of binding very much memory, you may set an arbitrarily large value for maxSubstreams (even Integer.MAX_VALUE is possible).

Cheers,
Enno.