使用可靠的代理模式进行有保证的邮件传递时，Akka将邮件保留多少次？ [英] how many times does Akka persist a message when using reliable proxy pattern to do guaranteed message delievery?

问题描述

Akka 2.1文档建议使用可靠的代理模式做有保证的消息传递，即，一条消息仅一次发送到收件人队列。为了确保在JVM崩溃时消息不会丢失，我相信消息存储在持久队列中。

The Akka 2.1 document suggests using the reliable proxy pattern to do guaranteed message delievery, i.e a message is delivery once and only once to the recipient queue. To make sure the message won't lost in case of JVM crashes, I believe the message is stored in persistent queue.

基本思想是从演员A到B，它将M发送到两个代理演员P和E，其中P在A一边，E在B一边。有关详细信息，请参见此图像

The basic idea is that to send message M from actor A to B, it sends M to two proxy actor P and E, where P is on A's side, and E is on B's side. See this image for detail

演员P和演员E是否需要自己的持久队列？从A发送到B的消息将被持久存储在P的队列和E的队列中，然后才被持久存储在B？

Does actor P as well as E need its own persistent queue? A message send from A to B will be persisted in P's queue and E's queue before being persisted in B?

推荐答案

自己不关心持久消息队列：它只是旨在使远程传递与本地传递一样可靠（在易失性网络所施加的不可靠性约束内）。因此，当JVM崩溃时，消息将丢失。

The pattern does not concern itself with persistent messages queues: it just aims at making remote delivery as reliable as local delivery (within the unreliability constraints imposed by a fallible network). Thus, when the JVM crashes messages will be lost.

这些参与者（P和E）在持久邮箱中不能很好地发挥作用，因为P将消息隐藏在内部，即不是坚持不懈。这样做会将他们从邮箱中取出。您需要调整模式以使P保留其内部队列。

These actors (P and E) do not play well with durable mailboxes, because P stashes the messages internally, i.e. not persistently. It takes them out of the mailbox to do so. You would need to adapt the pattern to have P persist its internal queue instead.

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