Akka.Persistence 1.5.42

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.

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.

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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.

Showing the top 20 packages that depend on Akka.Persistence.

Packages Downloads
Akka.Persistence.Query
Stream based query interface for persistence journal plugins for Akka.NET
 127
Akka.Cluster.Sharding
Sharded actors with managed lifecycle for Akka.NET cluster
 81
Akka.Persistence.Extras
Additional features and tools for the Akka.Persistence library.
 76
Akka.Cluster.Sharding
Sharded actors with managed lifecycle for Akka.NET cluster
 75
Akka.Cluster.Sharding
Sharded actors with managed lifecycle for Akka.NET cluster
 74
Akka.Cluster.Sharding
Sharded actors with managed lifecycle for Akka.NET cluster. Used to distribute state in a fault-tolerant, consistent fashion over an Akka.NET cluster.
 73
Akka.Cluster.Sharding
Sharded actors with managed lifecycle for Akka.NET cluster
 71
Akka.Cluster.Sharding
Sharded actors with managed lifecycle for Akka.NET cluster
 67
Akka.Cluster.Sharding
Sharded actors with managed lifecycle for Akka.NET cluster
 66
Akka.Persistence.Extras
Additional features and tools for the Akka.Persistence library.
 64
Akka.Cluster.Sharding
Sharded actors with managed lifecycle for Akka.NET cluster. Used to distribute state in a fault-tolerant, consistent fashion over an Akka.NET cluster.
 60
Akka.Cluster.Sharding
Sharded actors with managed lifecycle for Akka.NET cluster
 59
Akka.Cluster.Sharding
Sharded actors with managed lifecycle for Akka.NET cluster. Used to distribute state in a fault-tolerant, consistent fashion over an Akka.NET cluster.
 59
Akka.Persistence.Query.Sql
Akka.NET streams support for ADO.NET Persistence middleware.
 56
Akka.Cluster.Sharding
Sharded actors with managed lifecycle for Akka.NET cluster. Used to distribute state in a fault-tolerant, consistent fashion over an Akka.NET cluster.
 55
Akka.Persistence.Extras
Additional features and tools for the Akka.Persistence library.
 51
Akka.Cluster.Sharding
Sharded actors with managed lifecycle for Akka.NET cluster
 50
Akka.Cluster.Sharding
Sharded actors with managed lifecycle for Akka.NET cluster
 49
Akka.Persistence.Extras
Additional features and tools for the Akka.Persistence library.
 49

Akka.NET v1.5.42 contains several bug fixes and also adds new quality of life features to `Akka.IO.Tcp`, `Akka.Persistence`, `Akka.Pattern`, and `Akka.Cluster.Tools.DistributedPubSub`. * [IO.Tcp: Cleanup API](https://github.com/akkadotnet/akka.net/pull/7621) * [IO.Tcp: Fix `TcpListener` connection queue problem](https://github.com/akkadotnet/akka.net/pull/7621) * [Persistence: Allow user to use supervision strategy on journal and snapshot store](https://github.com/akkadotnet/akka.net/pull/7595) * [Core: Add cancellation token to `CircuitBreaker` API to signal timed out operations](https://github.com/akkadotnet/akka.net/pull/7624) * [Persistence: Change all `CircuitBreaker` protected method API to use cancellation token](https://github.com/akkadotnet/akka.net/pull/7624) * [Core: Leverage Exception...when pattern](https://github.com/akkadotnet/akka.net/pull/7614) * [IO.Tcp: Add `TcpListenerStatistics` and subscription methods](https://github.com/akkadotnet/akka.net/pull/7633) * [Cluster.Tools: Modernize `DistributedPubSub` code](https://github.com/akkadotnet/akka.net/pull/7640) * [Cluster.Tools: Optimize `DistributedPubSub` memory allocation](https://github.com/akkadotnet/akka.net/pull/7642) * [Cluster.Tools: Improve `DistributedPubSub` `DeadLetter` log message](https://github.com/akkadotnet/akka.net/pull/7646) * [Core: Refactor immutable collection builders to use simpler `CreateBuilder` pattern](https://github.com/akkadotnet/akka.net/pull/7656) * [IO.Tcp: Redesign `TcpConnection`](https://github.com/akkadotnet/akka.net/pull/7637) * [Cluster.Tools: Add `PublishWithAck` feature to `DistributedPubSub`](https://github.com/akkadotnet/akka.net/pull/7652) > [!WARNING] > > This release contains several public API breaking changes to Akka.IO.Tcp and Akka.Persistence **Akka.Pattern.CircuitBreaker** Backward compatible API changes: * New `.WithCircuitBreaker()` APIs were added that changes the protected function delegate to accept a new `CancellationToken` argument. * Old `.WithCircuitBreaker()` APIs were marked as obsolete. **Akka.Cluster.Tools.DistributedPubSub** The documentation for the new `PublishWithAck` feature can be read [here](https://getakka.net/articles/clustering/distributed-publish-subscribe.html#publishwithack) Backward compatible API changes: * There is a new `DistributedPubSubSettings` constructor that leverages the new `PublishWithAck` feature. The old constructor is marked as obsolete. **Akka.Persistence** The documentation for the new supervision strategy for journal and snapshot-store feature can be read [here](https://getakka.net/articles/persistence/storage-plugins.html#controlling-journal-or-snapshot-crash-behavior) Breaking API changes: Due to changes in `CircuitBreaker.WithCircuitBreaker()` APIs, several `Akka.Persistence` journal and snapshot-store were changed in a breaking manner. You will need to consider these changes if you have your own specific `Akka.Persistence` plugin implementation and needed to upgrade to this version of Akka. * AsyncWriteJournal * `DeleteMessagesToAsync()` * `ReadHighestSequenceNrAsync()` * `WriteMessagesAsync` * SnapshotStore * Both `DeleteAsync()` methods * `LoadAsync()` * `SaveAsync()` **Akka.IO.Tcp** The Akka.IO.Tcp has been redesigned to improve its reliability, visibility, and performance. This, unfortunately, requires some breaking changes to be introduced into the code base. New features: * The `TcpListener` actor now accepts a new `SubscribeToTcpListenerStats` message. Subscribers will receive regular `TcpListenerStatistics` metrics report from the `TcpListener`. * The new `UnsubscribeFromTcpListenerStats` message can be used to unsubscribe from the `TcpListener` Backward compatible changes: * The `Akka.IO.Tcp.Bind` command now contain a new settable `TcpSettings` property. * The `Akka.IO.Tcp.Connect` command now contain a new settable `TcpSettings` property. * The `Akka.IO.TcpSettings` class have several of its unused properties deprecated and/or changed: * The `ReceivedMessageSizeLimit` property has been deprecated, replaced with the new `MaxFrameSizeBytes` property. * New `ReceiveBufferSize` property added. * New `SendBufferSize` property added. Breaking API changes: * `Akka.IO.Tcp.Instance` static field has been removed. * `Akka.IO.TcpExt.BufferPool` static property has been removed. To [see the full set of changes in Akka.NET v1.5.42, click here](https://github.com/akkadotnet/akka.net/milestone/125?closed=1). 5 contributors since release 1.5.41 | COMMITS | LOC+ | LOC- | AUTHOR | |---------|------|------|---------------------| | 15 | 3480 | 2864 | Aaron Stannard | | 5 | 1711 | 713 | Gregorius Soedharmo | | 4 | 72 | 100 | Simon Cropp | | 1 | 172 | 51 | Arjen Smits | | 1 | 16 | 60 | JuYoung Kim |

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