How to retrieve a shard region form a different cluster node?

[Mutaz Qasem]

In the below code, how cluster node FrontendNode can get reference to the shard region "SomeShardRegion" 

that is already started in the other cluster node BackendNode?

When I try the code below I get this exception: Shard type [SomeShardRegion] must be started first.

Note: I don't want to start another "SomeShardRegion" in FrontendNode!

object BackendNode extends App {
  implicit val system = ActorSystem("ClusterSystem", config)

  ClusterSharding(system).start(
    typeName = "SomeShardRegion",
    entityProps = someProps,
    settings = ClusterShardingSettings(system),
    extractEntityId = idExtractor,
    extractShardId = shardResolver)
}

object FrontendNode extends App {
  implicit val system = ActorSystem("ClusterSystem", config)

  // throws an exception:  Shard type [SomeShardRegion] must be started first
  val shardRegion = ClusterSharding(system).shardRegion("SomeShardRegion")
}

[Justin du coeur]

Hmm.  ShardRegions are how you get to your sharded Actors.  I believe you have to create one on the Front End if it is going to talk to the Back End entities; if you don't want the Front End one to contain any Entities, start it in Proxy Only Mode.

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[Mutaz Qasem]

Exactly what I need. thank you

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