Akka Persistence Cassandra 1.0.1 released
Highlights of the 1.0.1 patch release: Possibility to opt out from writing to all_persistence_ids table, #784 Update to Alpakka Cassandra 2.0.1, which includes a new version of the Cassandra driver...
View ArticleUsing materialized values to derive ordering for MergeSorted
Hello, I have multiple sorted Sources[A, M] which I want to merge using MergeSorted. However, MergeSorted needs an Ordering[A], which will depend on the materialized values of the input sources. I...
View ArticleAkka 2.6.6: context.log.error("string") failed
Switched from 2.6.5 to 2.6.6 and I get the following error when I use context.log.It started working again after I removed the log statement. Was that use incorrect? Thanks for 2.6.6, especially with...
View ArticleHow can I change the behavior of actor to execute the received command
I would like to stash the received message and migrate the data after the success of the migration I change the behavior to execute the stashed command. trait Actor { this: Stash with Actor => def...
View ArticleAkka Cluster with 'm' ActorSystems amongst 'n' nodes
We are a ‘n’ node system (with one ActorSystem per node) and would like to run ‘m’ ActorSystems on it for load balancing. Each node should only run one ActorSystem. I could use ‘m’ ClusterSingletons...
View ArticleElasticsearch RestClient version conflict
Hi, I am using the following artifact: "org.elasticsearch.client" % "elasticsearch-rest-high-level-client" % "7.6.2" And this high-level-client contains the RestClient class that only has the two...
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Akka gRPC 1.0.0 released!
Dear hakkers, We’re happy to announce version 1.0.0 of Akka gRPC! gRPC is a transport mechanism for request/response and (non-persistent) streaming use cases. See Why gRPC? for more information about...
View Articleerror while starting up loggers
I’m NB in akka/scala. I added a logger config under src/resources/application.conf I’m getting the below error. I only want to know is this a runtime error of compilation error? Thanks! [info] Loading...
View ArticleFirst seed node couldn't join other seed nodes (artery)
Hi I use akka cluster version 2.6.3 with artery tcp remoting. In a 2-node cluster setup with raspberry pi’s, the first seed node (=node1) “Couldn’t join other seed nodes” after device reboot although...
View ArticleHow to use alsoTo
Hi, I would expect that the completion stage “b” completes in the example below. But it does not and “a” does. How do i get “b” to complete? ActorSystem system = ActorSystem.create(); Sink<String,...
View ArticleHow to persist to Cassandra and publish to Kafka multiple events
There is application on akka 2.5.29 , that has domain actors (extends some aggregate root actor) that can handle user commands, produce 0 to many events, and call processEvents(events) method of...
View ArticleAkka Http - Performance - CPU %
Hello, async-profiler shows that my akka-http server is spending 16% of CPU time on forkJoinPool.scan(10% on signalWork and 6% on unSafe.park). The server gets thousands of requests per second and...
View ArticleRemembering entities with cluster sharding
I would like to use the remember entities feature to automatically recover my persistent actors every time my application starts up (after it was stopped or crashed or whatever other reason). I am...
View ArticleListening to Dead Letters in Akka-Typed 2.5
I’m using Akka-Typed 2.5 and have an intermittent race condition of sending a message to an actor that has shut down before I received the Terminated message. Since this is an edge case, I figured the...
View ArticleAWS S3 multipart upload with Akka Http does not upload the full file
I am uploading a large file to S3 using akka HTTP with AWS SDK low level API. Routes: withoutRequestTimeout { withoutSizeLimit { fileUpload(“file”) { case (metadata, byteSource) =>...
View ArticleAkka HTTP 10.2.0-RC1 released
Dear hakkers, We are happy to announce the 10.2.0-RC1 release of Akka HTTP. This release is the first release candidate leading up to version 10.2.0 of Akka HTTP. Among other things, 10.2.0-RC1...
View ArticleOutbound control stream failed after shutdown
Hey there, I’m getting an error from akka.remote.artery.Association that Outbound control stream to [Akka://as@someip] failed after shutdown. Any clues about how to find out more about this? Thanks a...
View ArticleAkka Projections 0.3 released
We’re happy to release another milestone of Akka Projections, version 0.3. This version includes almost all features that we intend for upcoming 1.0.0. Telemetry is not fully completed yet. The API...
View ArticleConvert a Flow[In, Out, Mat] into a Flow[In, Try[Out], NotUsed]
Hello, I want to convert a Flow[In, Out, Mat] into a Flow[In, Try[Out]], NotUsed]. The following works for me: def `try`[In, Out, Mat](flow: Flow[In, Out, Mat])(implicit ec: ExecutionContext,...
View ArticleAkka Cluster Sharding - long GC pauses causing unreachable nodes
Hello everyone, we are running a cluster with Akka Cluster Sharding (Java) operating on about 30 million sharded entities. The cluster itself has 5 akka nodes with 80 GB RAM each and uses 3 cassandra...
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