BackOff supervisor with reactive-kafka

[Kilic Ali-Firat]

Hi Akka,

Something is unclear for me in code founded in reactive-kafka documentation. Below we are creating the supervisor using BackOff.onStop function. 

We are using the child props but we didn't create an actor using props. Do we need to create StreamWrapperActor with system.actorOf or the BackOffSupervisor will create the child ?

import akka.pattern.{Backoff, BackoffSupervisor}

val childProps = Props(classOf[StreamWrapperActor])

val supervisorProps = BackoffSupervisor.props(
  Backoff.onStop(
    childProps,
    childName = "streamActor",
    minBackoff = 3.seconds,
    maxBackoff = 30.seconds,
    randomFactor = 0.2
  )
)
val supervisor = system.actorOf(supervisorProps, name = "streamActorSupervisor")

[Patrik Nordwall]

The BackoffSupervisor will create the child StreamWrapperActor. You have to start the supervisorProps with actorOf.

It's probably easier to use the Streams restart stage

https://doc.akka.io/docs/akka/current/stream/stream-error.html?language=scala#delayed-restarts-with-a-backoff-stage

The reactive-kafka documentation should be updated to use that, and I think that was discussed in some ticket.

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Patrik Nordwall
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Lightbend -  Reactive apps on the JVM
Twitter: @patriknw

[Kilic Ali-Firat]

Hey Patrick, 

I will give a try to the Streams restart stage, in my use case, it seems more appropriate than wrapping streams in one actor. 

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[Kilic Ali-Firat]

Patrick, 

I'm using akka-streams 2.4.17 and it seems that RestartSource is not included in package akka.streams.scaladsl ?

Am I wrong ? 

[Kilic Ali-Firat]

Ok fouded in last version 2.5.7