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Akka cluster using Cassandra driver and running on EKS, with Keyspaces for...
This WARN happens after an action is performed by the Cassandra driver after persisting data. [2020-09-10 07:12:00,123] [WARN] [] [com.datastax.oss.driver.internal.core.pool.ChannelPool] [s0-admin-1]...
View ArticleWhy does Akka recommend having 10x as many shards as nodes?
I was trying out an experiment with Persistent actors on a cluster, backed by Cassandra, with a million actors. I had 3 nodes with 9 shards, and the throughput was lower than what I was expecting....
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Akka Cassandra projection not working when used along with kafka sharded cluster
Hey guys, I have a project which utilises Akka Sharded Cluster with Kafka, with persistent Actors on Cassandra, which works fine. This application’s goal is to consume messages from kafka then...
View ArticleProblem with Wildfly and Akka 2.6 related to flight recorder (jdk.jfr.Event)
Just wanted to let you know the following because I could not really find a solution to this on the internet: I’ve just upgraded my project from Akka 2.5 to 2.6.9 We currently use Wildfly together...
View ArticleIssue while uploading compressed file to S3 using Alpakka
I tried to upload contents of a compressed tar file into S3 using Alpakka but only 1-2 entries were copied, rest of them were skipped. When I increased the chunck size to a big number (double of file...
View ArticleAlpakka 2.0.2 is now available!
Dear Hakkers, The Alpakka contributors are happy to announce Alpakka 2.0.2. Alpakka is compatible with Akka 2.5.31+ and Akka 2.6.8+. All modules are published for Scala 2.12 and Scala 2.13, and most...
View ArticleAkka projections on events that are not tagged
Hello I want to start using akka projection in my project. I am using akka cluster and I’d like to use the ShardedDaemonProcess to distribute the load. Currently I have a database with ~million events...
View ArticleAkka HTTP Client Pool getting Request Timeout 408 after upgrade to 10.2.0
Dear hakkers, we are building a routing system wich integrates a lot of different rest services. We were using akka 2.5 , currtently we moved to akka 2.6.9 and Akka Http 10.2 and suddenly we receive...
View ArticleNot receiving terminated event from remote Actor
This is on Akka 2.6.8: Our clustered Akka deployment has become quite unreliable and it seems that we are not receiving all terminated events from remote actors. Today I have found a pretty clear case...
View ArticleAkka cluster sharding base on traffic of shards
Akka cluster sharding-coordinator uses LeastShardAllocationStrategy to decide. but the problem is some times all memebers not equal , i mean some members will have more traffic than others , so if...
View ArticleWebsocket server doesn't work anymore in new (10.1.2 -> 10.2.0) version and...
Hello - I tried today to add new features to a messaging server using Websocket I worked on a few weeks ago. At the time I was using Akka HTTP 10.1.2. The language to bind to an HTTP connection was...
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LocalActorRef memory leak and Full GC Allocation Failure causing gc to take...
Hi We use akka cluster with persistence version 2.6.6_2.13 and our application runs on raspberry pi 3’s (compute module). When having -Xmx set to 128m for the jvm, it takes about 26 hours until the...
View Article`forward` pattern in Typed
Hi, In classic, you could have actor A ask actor B, B could forward that request to C, and C would respond to A (on B's behalf). “A” would ask with a timeout, and handle the same, but B would simply...
View ArticleJava Generic Command for EventSource Actor : Jackson serialization
Hi, I am using Jackson serialization for all the actor message communication. The configuration is working fine, but the message is de-serialize into a Scala Hashmap instead of the right type: Below...
View ArticleHow to find cluster sharded entity Actors by entity id
Hi , We have a requirement where a kafka message from external system is suppose to update one unique Sharded entity. The message has information on the unique entity id key. what is the recommended...
View ArticleRoleLeaderChanged appoints 2 leaders during start-up of a node
Akka 2.6.8 Java 8 I have found another source of unstable behavior in our production cluster. Following situation: I have 2 running nodes A and B. Node A has been appointed as the leader by evaluating...
View ArticleAkka-Cluster: Decreasing system performance having many active actors
Hello everyone, we are running an actor system (cluster sharding) having about 5 Million per node. With a constant inbound message rate we are seeing the system slowing down having more and more...
View ArticleCheck if an actor (Abstract / sharded / event source) with an ID is already...
Hi , Is there a way to check if the actor is already created, using a unique ID ? We have a requirement, to follow certain different behaviors with new and existing actors. Thanks. 1 post - 1...
View ArticleHow to exit stream after n elements recieved?
Hello, I’m brand new to Akka and I’m just trying to get the hang of it. As an experiment, I want to read from a Kinesis stream and collect n messages and stop. The only one I found that would stop...
View ArticleAkka Cluster Connection Refused Between Machines
I am crossposting this issue between here and StackOverflow (https://stackoverflow.com/questions/64108688/akka-cluster-connection-refused-between-machines) since this is specific to Akka. I am...
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