[jhartmann]

Nice article. One thing you should talk about in my opinion are systems like Redis. Redis can be used as a generalized key value store, but it can also be used as a messaging platform. In fact many systems like Storm (which would be another great topic) have easy integration with redis pub subs. While Redis and other solutions like it probably are not a good fit for all your data, they are great for mixed supporting data, caching and messaging. There are also really nice integrations if you like Java, these days you can make Spring message driven beans to consume messages from a redis pub sub very easily with minimal configuration. ZeroMQ is probably another technology that is worth discussing, either using it with a layer like Storm on top or by itself. Not every messaging system has to be heavyweight and cumbersome like the good ole' days.

[nesquena]

Definitely, thanks for your feedback. Will be bringing up redis in the next post. Redis has some messaging functionality baked right in and can be a good solution as seen with https://github.com/defunkt/resque in Ruby as well. ZeroMQ is also an important technology to understand in the context of this discussion.