CODEWITHSUNDEEP
scalaakkaakka-cluster
Scony
Scony

Reputation: 4138

Is there atomic broadcast in akka?

I need atomic broadcast and I want to use akka cluster.

I'm not sure is there atomic broadcast in akka, so I just want to ask, to be sure.

I know, there are such things like DistributedPubSubMediator.SendToAll aswell as Cluster Aware Routers. Does any support total order broadcast ?

By atomic (total order) broadcast I mean, actor A sends broadcast bA aswell as actor B sends broadcast bB (in parallel & from another node). Eventually, (every actor receives message bA before bB) or (every actor receives message bB before bA).

Upvotes: 1

Views: 231

Answers (2)

dk14
dk14

Reputation: 22374

By default there is no such guarantee as messages are sending asynchronously. But you can just use some mediator X (any actor including DistributedPubSubMediator) which will induce such guarantee: send (bA, recipients) from A to X, send (bB, recipients) from B to X, and X should just broadcast every message to its recipients (it will be "atomic" and sequential, as done inside one actor).

If you need to do this in cluster - you could try "Cluster Singleton" to avoid single point of failure by sacrificing high availability and maybe partition-tolerance (you will have to remove nodes manually from the cluster to allow the "P")

Upvotes: 1

Ryan
Ryan

Reputation: 7247

The only ordering guarantee offered by Akka is that messages sent from actor A to actor B will be received in order for that pair of actors. Messages from other actors to actor B could be received before, after or interleaved with the messages from A to B.

So no, Akka does not provide the ordering guarantee you're asking for.

Upvotes: 3

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