In my last post, I talked about a couple of strategies for setting up disaster recovery for Apache Artemis brokers. In hindsight though, I thought that the subject of the Idempotent Camel Consumer could have used a little more discussion.

A few years back, I wrote a blog about HA strategies for Fuse/AMQ. In it, I talked about a few potential solutions for setting up a DR (Disaster Recovery) configuration for ActiveMQ. The most popular solution, it seems, was to utilize block-level disk replication software. Since it’s been quite a while, and since we’ve updated our messaging code base to Apache Artemis, I figured I’d write up a new post with yet another potential architecture.

So Red Hat AMQ 7 has been out for a while now, and there have already been a lot of customers who are understandably eager to upgrade to the latest and greatest version. Many of them have been reaching out and asking for help/instructions on how to migrate. So far I’ve been replying that I already blogged about that here: Decommissioning JBoss A-MQ brokers. But that reply has been met with some confusion. So I figured I’d write up a more concrete set of instructions.

In a perfect world, every project would be a greenfield project and you could pick and choose the latest/greatest broker every time. And of course, if given the choice you’d pick Apache Artemis… ;) But in the real world, it is much more common that customers will have a very large existing codebase and will have to transition to the latest/greatest over some much longer period of time. And during that period, it’s helpful to be able to set up some sort of bridge between your brokers so that your old and new code can still communicate.

There are loads of use cases which require “all or nothing” processing. And there are a bunch of different strategies for accomplishing said result. Luckily for me, they’ve already been covered many times in tons of different blogs/books/articles. So for this post I’m just going to concentrate on a few of the strategies, and more specifically, how to do them with Apache Camel.