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Questions tagged [akka-cluster]

Akka cluster is a new (2.1+) functionality that allows one to build cluster capabilities on top of the Akka middleware.

486 questions
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Simple approach to synchronizing data across an Akka cluster?

I've got some run-time data I'd like to exist on a designated actor on every node in my Akka cluster, which could be updated via internal event or API call to a single node. I could store this data in a shared database to make it permanent, but I'd…
acjay
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Akka Cluster Distibributed Pub Sub -- should I combine with eventStream?

I’m using Distributed Publish Subscribe as a means to publish updates in my clustered system to clients connected over Websockets. But I want my clients to begin receiving updates with minimal delay. I know from the docs that Distributed Pub Sub…
acjay
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akka-streams with akka-cluster

My akka-streams learn-o-thon continues. I'd like to integrate my akka-streams application with akka-cluster and DistributedPubSubMediator. Adding support for Publish is fairly straight forward, but the Subscribe part I'm having trouble with. For…
Will I Am
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Akka cluster seed nodes sequence

Should all the nodes have the same sequence of cluster nodes, specially the first node in the seed list? For example Node-1: Seed nodes {Node-1, Node-2} Node-2: Seed nodes {Node-2, Node-1} The node sequence is different for both…
Arslan Mehboob
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Do you run a separate Actor System on each host in a distributed system using Akka Cluster?

Here's my assumption based on Stackoverflow reading. You have a multiple system components: Database Authentication Web Each system component runs on a separate host as described in the microservice pattern. In other to glue these host together…
user1187135
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Akka distributed pub sub: Java implementation not working

Main class for Subscriber: Application.java package com.mynamespace; import org.springframework.boot.SpringApplication; import org.springframework.boot.autoconfigure.SpringBootApplication; import…
Vaibhav Raj
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How to broadcast message to all actors in an AKKA cluster in java?

I have an AKKA cluster system with name say ClusterSystem. Each node of this cluster have an actor ActorA. I want a way to broadcast a message sent to an actor to all the ActoraA-s running in the cluster. It would be of great help if any one can…
Rishav Basu
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Beginners guide for Mesos, Marathon, Docker Integration

I am scratching my head, to figure out how the combination of docker, mess and marathon can help me in building my distributed application. Application has a backend comprising of services processing client requests and returning json data, which…
thegeek
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Akka actors and Clustering-I'm having trouble with ClusterSingletonManager- unhandled event in state Start

I've got a system that uses Akka 2.2.4 which creates a bunch of local actors and sets them as the routees of a Broadcast Router. Each worker handles some segment of the total work, according to some hash range we pass it. It works great. Now, I've…
Michael Kohout
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Test if actor sender was local or remote

I need to determine whether the sender of a message was one of the local or remote actors in the Akka cluster. At present the only way I've found to do this is def isLocal(sndr: ActorRef) = sndr.path.address.toString ==…
Pengin
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Multiple akka system in a single pc

How can we run multiple akka nodes in a single pc? Currently, I've following in my application.conf file. For each system, I added different port numbers, but, I can't start more than one instance. Error says, Address already in use failed to…
Abimaran Kugathasan
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Akka 2.2 ClusterSingletonManager sending HandOverToMe to [None]

I'm using Akka 2.2 contrib's project ClusterSingletonManager to guarantee there is always one and just one specific type of actor (master) in a cluster. However, I've observed an odd behaviour (which, incidentally, may be expected, but can't…
Hugo Sereno Ferreira
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Akka Cluster Java API sample

I am pretty interested in testing out the 2.0-SNAPSHOT Akka cluster features, but for my purposes would like to do this in Java. I have read through the example here: http://letitcrash.posterous.com/clustered-actors-with-cloudy-akka But the API…
D Parsin
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a.i.TcpListener - Bind failed for TCP channel on endpoint [/127.0.0.1:2551] java.net.BindException: [/127.0.0.1:2551] Address already in use

When i am trying to create a Typed Actor System using the object. It is normally creating the Actor System. implicit val askTimeout: Timeout = Timeout(5.seconds) ActorSystem[Nothing](MailSendActor.apply, "application") } where MailSendACtor…
Sanjana Aggarwal
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Akka stateless actors with Persistent Mailboxes

I want to create an Akka Cluster with 1000s of actors. Each actor receives a message, does some calculations and writes the result into a dedicated Kafka topic. It should be deployed in a cluster, for example Kubernetes. My understanding is that -…
Archie
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