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Spark: Parse CSV file and group by column value

I’ve found myself working with large CSV files quite frequently and realising that my existing toolset didn’t let me explore them quickly I thought I’d spend a bit of time looking ...
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First steps with REST, Spray and Scala

On this site you can already find a couple of articles on how to do REST with a multiple of different frameworks. You can find an old one on Play, some on Scalatra and I even started ...
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Akka Notes – Actor Supervision – 8

Failures are more like a feature among distributed systems. And with Akka’s let it crash fault tolerance model, you could achieve a clear separation between your business logic ...
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Clustering reactmq with akka-cluster

In the last two posts on reactmq, I described how to write a reactive, persistent message queue. The queue has the following characteristics:                  there ...
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Akka Notes – DeathWatch – 7

When we talked about Actor lifecycle, we saw that Actors could be stopped by various means (using ActorSystem.stop or ActorContext.stop or sending a PoisonPill – there’s ...
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From Java 7 Futures to Akka actors with Scala

This blog post will show you how a step by step transition from a “java 7 and j.u.c.Future” based implementation to an “akka actor written in scala solution” looks like. It ...
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Keeping the Meaning with the Bytes

Back to the Future… This post was from November 2006. I had just started playing with Scala and was trying to figure out an ORM… the one that ultimately became Lift’s ...
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Testing your plugin with multiple version of Play

So, you’ve written a plugin for Play…are you sure it works? I’ve been giving Deadbolt some love recently, and as part of the work I’ve added a test application for functional ...
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Akka Notes – Child Actors and ActorPath – 6

Actors are completely hierarchical. Whatever Actors that you create HAS to be a child of some other Actor. Let’s analyze that a bit : Path Say, we create an ActorRef using ActorSystem.actorOf ...
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Akka Notes – Actor Lifecycle – Basic – 5

(Please note that this lifecycle write-up does not cover the preRestart or the postRestart methods. We’ll talk about them when we discuss supervision) The basic Actor lifecycle ...
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