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    Erlang DC 2013 Schedule

    February 9, 2013

    ( 13 available presentations )
    2244 erlangdc2013 cowboy and websockets thumb 0002 thumb
    Rating: Everyone
    Viewed 1,489 times
    Recorded at: February 9, 2013
    Date Posted: February 18, 2013

    One of the main advantages of using Cowboy is that it allows you to create very responsive applications in parts thanks to the Websocket technology. This live demonstration will explain you the steps to follow to write a basic chat application with Cowboy and Websocket.

    Objectives: Learn how to use Cowboy and how to write HTTP and Websocket handlers. Find out how easy it is to write a dynamic web application starting from scratch.

    Target audience: Opened to all. Erlang language knowledge preferable but not required.

    2288 erlangdc2013 cracking the chicken and egg problem thumb 0004 thumb
    Rating: Everyone
    Viewed 1,021 times
    Recorded at: February 9, 2013
    Date Posted: March 9, 2013

    With any new programming language or technology, you have the chicken-and-egg problem: "You need the experience to get the job, but you need the job to get the experience." In Erlang's case, There are two things that make this more acute: The kind of systems that Erlang is particularly good for are exactly the kind of systems that you don't want to be building if you don't know what you're doing; and Erlang is not like the other kids. If you're new to functional programming, it's a whole 'nother country, and Erlang has some unusual syntax and language features on top of that. We'll talk about how to get around these early hurdles, and why learning Erlang is its own reward.

    2243 erlangdc2013 using erlang to drive a mobile payment application thumb 0001 thumb
    Rating: Everyone
    Viewed 1,135 times
    Recorded at: February 9, 2013
    Date Posted: March 18, 2013

    This talk will discuss the backend implementation of the transaction and payment processing system for the Wingman mobile application. It will show how the requirements of high-demand mobile app interactions can be addressed via the creation of a RESTful API on top of a scalable server-based platform coded entirely in Erlang. It will conclude with a live demonstration where the operational backend will be published to Heroku's hosted service.

    2242 erlangdc2013 erlang meta programming with elixir thumb 0000 thumb
    Rating: Everyone
    Viewed 4,816 times
    Recorded at: February 9, 2013
    Date Posted: April 15, 2013

    We all know Erlang as a language has certain limitations (for better or worse). It also makes you write a lot of boilerplate code. Sometimes we can put up with it, sometimes it's just annoying.

    I've been looking into different meta-programming techniques to be used with Erlang. I've been using parse transformations a lot (and gave talks about them). But that wasn't enough for me. I've tried investing some time in Joxa (joxa.org, which is awesome, btw), but I found that it is a little bit more of a Lisp than Erlang. So I continued my search, and took another look at Elixir (elixir-lang.org), which I dismissed last year. It went through quite a transformation and, in my opinion, became a decent meta-compiler for Erlang that's not too far away from Erlang itself.

    In this talk I'll show how you can program Erlang in a much more productive way — and common pitfalls to avoid.

    2404 erlangdc2013 lightning talk little languages in erlang thumb 0003 thumb
    Rating: Everyone
    Viewed 1,916 times
    Recorded at: February 10, 2013
    Date Posted: April 15, 2013

    2405 erlangdc2013 lightning talk relcool thumb 0000 thumb
    Rating: Everyone
    Viewed 976 times
    Recorded at: February 10, 2013
    Date Posted: April 15, 2013

    2406 erlangdc2013 lightning talk sync thumb 0003 thumb
    Rating: Everyone
    Viewed 918 times
    Recorded at: February 10, 2013
    Date Posted: April 15, 2013

    2407 erlangdc2013 redbug dynamically trace erlang thumb 0004 thumb
    Rating: Everyone
    Viewed 1,971 times
    Recorded at: February 10, 2013
    Date Posted: April 15, 2013

    2408 erlangdc2013 warning erlang may get you fired thumb 0000 thumb
    Rating: Everyone
    Viewed 1,254 times
    Recorded at: February 10, 2013
    Date Posted: April 15, 2013

    2409 erlangdc2013 lightning talk all you need is the internet thumb 0001 thumb
    Rating: Everyone
    Viewed 1,150 times
    Recorded at: February 10, 2013
    Date Posted: April 15, 2013

    2241 erlangdc2013 erlang otp networked sensors savior thumb 0001 thumb
    Rating: Everyone
    Viewed 1,096 times
    Recorded at: February 10, 2013
    Date Posted: April 15, 2013

    For years, integration of sensors into IP networks has been wandering in the desert of OO languages, tight coupling, and poor reliability. The promised land of service oriented architectures supporting any and all integration standards has been elusive and out of reach due to poor support of the modern, mainstream languages. Reaching forward from the past, Erlang, with its roots in high-reliability telecom (i.e. network) application development has arisen to deliver networked sensor application development into the promised land. This talk will discuss the specific challenges faced by today's sensor networks in use by the commercial sector and military can be easily and appropriately handled by Erlang.

    2245 erlangdc2013 getting your first 200mm pageviews with erlang otp thumb 0003 thumb
    Rating: Everyone
    Viewed 1,501 times
    Recorded at: February 10, 2013
    Date Posted: April 15, 2013

    As the development team behind an anonymous social network that has become one of the fastest growing apps in the Apple Store, we'll do a detailed dive into the architecture of this very big Erlang/OTP app. The original architecture was Riak-based and in a series of dire moments we had to replace it with a SQL database due to TCP Incast, a network problem affecting Riak map/reduce under heavy load in certain network topologies. We'll talk about when and when not to use Riak. Our caching infrastructure, heavy use of gproc and pg2 for cross-server communication, socket connection infrastructure, novel use of Erlang processes in conjunction with Elastic Search for location based search, and scalable bayesian spam filtering will all be covered.

      erlang dc 2013 ranking games and scheduling jobs by jesper louis andersen   youtube 2 thumb
    Rating: Everyone
    Viewed 1,320 times
    Recorded at: February 10, 2013
    Date Posted: December 4, 2013

    Erlang is an efficient tool when your problem includes I/O of any kind. Often it is the massive concurrency which is touted as a prime point. In this talk however, we use Erlang for its features of fault tolerance, isolation and rapid development. In fact, we claim that sometimes it is more important to limit an application, as to not overload foreign systems.

    We present an application, QLGlicko, which scrapes Quake Live duels and ranks them according to the Glicko2 system. The idea is to rank players according to their strength, partially for bragging purposes, partially for match-making. Erlang is used for all parts: scraping the Quake Live website, ranking individual players, parameter optimization via simulated annealing and finally presentation in a web interface via Cowboy.

    We describe why Erlang is a good fit for the problem and present an erlang-idiomatic approach to protecting the Quake Live site from overload. We describe how concurrency helps, even if the load on your system is fairly low. We describe how the system keeps stable due to isolation of concerns. And we briefly cover how we made sure the numerical stability of the ranking was adequate.