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222222 (4) [Avatar] Offline
In chapter 3.4.5 it says:

There is also concern about backpressure, or the ability to communicate backwards through the system that the application is saturated in load. If you need the ability to implement backpressure, you must do so yourself.

But Monifu provides backpressure out of the box in scala and scalajs. So that makes 2 with the to be coming akka streams. It looks like this is not so much of a problem.
roland.kuhn (39) [Avatar] Offline
We will revise chapter 3, it also contains other inaccuracies of this kind—expect this to be the least long-lived contents of the book, the rest should remain valid for longer than the current technologies are around.