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Akka群集，群集分片和群集单例用例

[英]Akka Cluster, Cluster Sharding and Cluster singleton use cases

原文 2014-07-29 03:24:56 2 2 java/ akka/ akka-cluster/ akka-persistence

I am writing an Akka application and I want to use the Akka Cluster feature that Typsafe provides. 我正在编写一个Akka应用程序，我想使用Typsafe提供的Akka群集功能。 I am trying to understand the main difference between Akka Cluster, Akka Cluster Singleton and Akka Cluster Sharding. 我试图了解Akka群集，Akka群集Singleton和Akka群集分片之间的主要区别。 To me, they seem to be providing similar things. 对我来说，他们似乎提供了类似的东西。

In my scenario I want to have a cluster that will have: 在我的场景中，我想要一个具有以下内容的集群：

Stateless actors that could live in any machine (I will have a pool of them) 可以生活在任何机器中的无状态参与者（我将拥有他们）
Stateless actors that I want them to live in specific machines 我希望他们生活在特定机器中的无状态演员
Stateful actors that could live in any machine but I need just one instance of them across the whole cluster and being able to restart the actor with its previous state if it dies. 有状态的actor可以驻留在任何计算机中，但是我只需要它们在整个集群中的一个实例，并且能够在死亡时以其先前状态重新启动actor。

Based on what I have read I would need Akka Cluster for the first kind, Akka Cluster Singleton for the second kind and Akka Cluster Sharding for the third kind. 根据我所读的内容，第一类将需要Akka群集，第二种需要Akka群集Singleton，第三种需要Akka群集分片。 Is my assumption correct? 我的假设正确吗？ I am looking for some guidance as well as any example online if you know any. 我正在寻找一些指导以及在线示例（如果您知道的话）。

2 个解决方案

Take a look at https://github.com/dnvriend/spray-ba-sharding and https://github.com/dnvriend/spray-ba-singleton for some use case. 看一下https://github.com/dnvriend/spray-ba-sharding和https://github.com/dnvriend/spray-ba-singleton的一些用例。 The akka documentation is actually pretty good. Akka文档实际上非常好。 Also look at the activator templates. 还要看激活器模板。

"Stateless actors that could live in any machine" -- this sounds like akka cluster. “可以在任何机器上生活的无状态演员”-听起来像akka集群。

"Stateless actors that I want them to live in specific machines" -- this sounds like akka cluster singleton, but you can also use roles “我希望他们生活在特定机器中的无状态演员”-听起来像akka群集单例，但您也可以使用角色

"being able to restart the actor with its previous state if it dies" -- this sounds like Akka Cluster Sharding with akka-persistence. “如果死亡，便能够以其先前的状态重新启动参与者” –听起来像是具有akka持久性的Akka群集分片。