Quem Usa Erlang?

It was built at the end of the 1980s at Ericsson for handling telephone switches. At the time, telephone switching systems were one of the most complicated systems out there, like the internet is nowadays. For this reason, the language used to program them needed to support high concurrency and zero downtime.

So its sweet spot is expanding, The difficult thing is that the official docs can't keep up very well, and the mailing list and erlang blogosphere volume are growing quickly

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An XMPP server (like ejabberd) can be seen as a high level router, routing messages between end users. Of course there are other features, but this is the most important aspect of an instant messaging server. It has to route many messages simultaneously, and handle many a lot of TCP/IP connections.

We are using Erlang to provide the back-end muscle power for our really real-time browser-based multi-player game Pixza. We don't use Flash or any other third-party plugins, though the game is real-time multi-player. We use pure JS and COMET techniques instead. And Erlang supports the "really realtimeliness" of Pixza.

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In all actuality, letting it crash is not about crashing for the user or the system. That is something Erlang tries very hard to avoid. Rather, it is about containing failure when it inescapably happens, since in life, things do sometimes fail. Shit happens. Let’s see how Erlang cleans it up.

Asynchronous: the real world is async so Erlang was built to account for this basic nature. One feature that contributes to this requirement: Erlang's "free" processes (>32000 can run concurrently).

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At the bottom leaves of the tree, we have worker processes – the ones doing most of the work. Up from them, we have supervisors, which launch the workers and check up on them.

In case a process crashes, it sends a message to its supervisor. Depending on the supervision strategy set, either just the process is restarted or all of the processes underneath its supervisor are.

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Do note though, that the people wrote the paper were in the stages of first learning Erlang, and may not have known the proper development procedures for CPU intensive Erlang.

If the last is true, I would actually point your way towards Elixir. While both languages are great to use, Elixir is the one that seems to be more popular lately. It will give you more job opportunities and will be easier to learn.

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I think it's the one of most interesting project for learning erlang because it is really building on erlang's strength. (However some will argue that it's not OTP, but don't worry there's still a trove of great code inside...)

I'm working for wooga, a social game company and we use Erlang for some of our game backends (basically http apis for millions of daily users) and auxiliary services like ios push notification provider, payment etc.

Of course I could talk about its functional roots but this aspect is somewhat orthogonal to the main goal (high availability). The main component of the functional nature which contributes generously to the target goal is, IMO: "share nothing". This characteristic helps contain "side effects" and reduce the need for costly synchronization mechanisms.

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A couple years ago, Tim Bray's Wide Finder publicity and all the folks starting to do web app frameworks and HTTP servers lead (at least in part) to improved regex and binaries handling. And there's all the work integrating HiPE and SMP, the dialyzer project, multiple unit testing and build libs springing up, ..

The processes are isolated, fast to create, and take up only a small amount of memory. It is easy to expand your system by creating more of them. Since the processes don’t discern whether the other processes are on the same core or in another place, you can easily scale both horizontally (by adding more machines) and vertically (by adding cores).

Afterward, you can learn Erlang and what makes it tick. Knowing how Erlang functions underneath Elixir will help you write better Elixir code and make you more likely to get hired as an Elixir developer.

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