Akka 1.6.0-beta6

Akka.NET

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Akka.NET is a .NET port of the popular Akka project from the Scala / Java community. We are an idiomatic .NET implementation of the actor model built on top of the .NET Common Language Runtime.

Using the v1.6 betas? Start here.

Akka.NET is a .NET Foundation project.

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How is Akka.NET Used?

Akka.NET can be used in-process or inside large, distributed real-time systems; we support a wide variety of use cases.

Akka.NET can be used to solve the following types of problems:

  1. Concurrency - Akka.NET actors only process messages one-at-a-time and they do so in first in, first out (FIFO) order; this means that any application state internal to an actor is automatically thread-safe without having to use locks or any other shared-memory synchronization mechanisms.
  2. Stream Processing - Akka.NET actors and Akka.Streams make it easy to build streaming applications, used for processing incoming streams of data or incoming streams of live events such as UI or network events inside native applications.
  3. Event-Driven Programming - actors make it easy to build event-driven applications, as actors' message-processing routines naturally express these types of designs.
  4. Event Sourcing and CQRS - Akka.Persistence, used by actors to make their state re-entrant and recoverable across restarts or migrations between nodes, natively supports event sourcing. Akka.Persistence.Query can be used to compute CQRS-style projections and materialized views from Akka.Persistence data.
  5. Location Transparency - Akka.Remote makes it simple for actors in remote processes to transparently communicate with each other.
  6. Highly Available, Fault-Tolerant Distributed Systems - Akka.Cluster, Akka.Cluster.Sharding, and other tools built on top of Akka.Cluster make it possible to build highly available and fault-tolerant distributed systems by leveraging peer-to-peer programming models with topology-aware message routing and distribution.
  7. Low Latency, High Throughput - Akka.NET aims to be low latency and high throughput, processing 10s millions of messages per second in-memory and hundreds of thousands of messages per second over remote connections.

Where Can I Learn Akka.NET?

You can start by taking the Akka.NET Bootcamp, but there are many other great learning resources for Akka.NET Online.

Build Status

Stage Status
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.NET Framework Unit Tests Build Status
.NET Unit Tests (Windows) Build Status
.NET Unit Tests (Linux) Build Status
.NET MultiNode Tests (Windows) Build Status
.NET MultiNode Tests (Linux) Build Status
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Install Akka.NET via NuGet

If you want to include Akka.NET in your project, you can install it directly from NuGet

To install Akka.NET Distributed Actor Framework, run the following command in the Package Manager Console

PM> Install-Package Akka.Hosting

Akka.Hosting includes the base Akka NuGet package and also provides an easy interface to integrate Akka.NET with the most-used parts of the Microsoft.Extensions ecosystem: Configuration, Logging, Hosting, and DependencyInjection. We encourage developers to adopt it.

And if you need F# support:

PM> Install-Package Akka.FSharp

Akka.NET Project Templates

To create your own Akka.NET projects using our templates (Akka.Templates), install them via the dotnet CLI:

dotnet new install "Akka.Templates::*"

This will make our templates available via dotnet new on the CLI and as new project templates inside any .NET IDE such as Visual Studio or JetBrains Rider. You can view the full list of templates included in our package here: https://github.com/akkadotnet/akkadotnet-templates#available-templates

Builds

Please see Building Akka.NET.

To access nightly Akka.NET builds, please see the instructions here.

Support

If you need help getting started with Akka.NET, there's a number of great community resources online:

If you and your company are interested in getting professional Akka.NET support, you can contact Petabridge for dedicated Akka.NET support.

No packages depend on Akka.

Akka.NET 1.6.0-beta6 adds top-level C# 15 union serialization and makes distributed data the default store for cluster sharding coordinator state. Read the v1.6 getting started guide for the full upgrade path.

Serialization V2

  • C# 15 unions can now be sent or persisted as top-level messages with [AkkaSerializable(Manifest = "...")]. Deserialization reconstructs the boxed union, so Receive<TUnion> and Recover<TUnion> handlers continue to match. Closed generic unions register each construction with [AkkaSerializerIncludes<T>]. Standalone cases retain their own manifests, and explicitly included types discovered in referenced assemblies no longer cause duplicate registrations. (#8908, fixes #8906)
  • Top-level unions use their own manifest with the existing union-field payload frame. Writing default(TUnion) at the top level throws SerializationException; field nil semantics are unchanged. AKKASG051 now requires an explicit manifest on a marked union. Reordering cases preserves the wire format; adding cases requires readers to upgrade before writers use them, and removing cases prevents reading stored values of those cases. Switching between a union and a closed hierarchy still requires a migration for top-level messages. (#8908)

Akka.Cluster.Sharding - behavior change

  • akka.cluster.sharding.state-store-mode now defaults to ddata instead of persistence. Coordinator state is replicated through Akka.DistributedData. The previous default silently used the in-memory journal when no durable journal was configured, losing coordinator state when the coordinator moved. (#8905, addresses #8903)
  • Migration: set akka.cluster.sharding.state-store-mode = persistence explicitly to preserve the previous behavior. With remember-entities = on, the new default follows remember-entities-store, which defaults to ddata, rather than forcing the event-sourced store. Set akka.cluster.sharding.remember-entities-store = eventsourced to keep reading remembered entities from the journal. See the v1.6 breaking-change ledger. (#8905)

2 contributors since release 1.6.0-beta5

COMMITS LOC+ LOC- AUTHOR
2 328 30 Aaron Stannard
1 1 1 dependabot[bot]

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1.6.0-beta6 1 11/7/2026
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1.6.0-beta4 20 10/29/2026
1.6.0-beta3 20 10/7/2026
1.6.0-beta2 15 10/7/2026
1.6.0-beta1 25 10/3/2026
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1.5.70 30 7/5/2026
1.5.70-beta2 30 7/4/2026
1.5.70-beta1 22 6/26/2026
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1.5.57-beta2 52 12/4/2025
1.5.57-beta1 59 12/2/2025
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1.5.0-alpha4 74 10/23/2025
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1.4.0 56 11/26/2025
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0.2.1-beta 75 10/23/2025
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