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Achieving Sub Second SQL JOINs and building a data warehouse using Spark, Cassandra, and FiloDB


Evan loves to design, build, and improve bleeding edge distributed data and backend systems using the latest in open source technologies. He is the creator of the FiloDB open-source distributed analytical database, as well as the Spark Job Server. He has led the design and implementation of multiple big data platforms based on Storm, Spark, Kafka, Cassandra, and Scala/Akka, including ...

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The Method Behind March Madness


There are 150 quintillion (i.e. the one after trillion) permutations to consider when completing your NCAA bracket. Some of us don’t have time to review them all; if you are likewise short on time, you can let MapR do the heavy lifting for you and get your personalized bracket from the Crystal B-Ball! In this post, we describe the methodology ...

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What I learned about helping teams use WIP limits


The Work In Progress limit (WIP limit from now on) is one of the most powerful but counter-intuitive concepts I had the fortune to encounter in my work life. When suggesting teams to introduce a WIP limit to their boards, I hear objections like “are you saying that doing less things at the same time is going to make you faster? ...

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10 Awesome Python Tutorials to Kick-Start your Projects


Python is a widely used high-level, general-purpose, interpreted, dynamic programming language. Its design philosophy emphasizes code readability, and its syntax allows programmers to express concepts in fewer lines of code than would be possible in languages such as C++ or Java. The language provides constructs intended to enable clear programs on both a small and large scale. Python supports multiple ...

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Printing arrays by hacking the JVM


Overview One the most common gotchas in Java, is knowing how to print arrays. If an answer on how to print an array get more than 1000 upvotes, you have to wonder if there is a simpler way. Just about every other popular language has that simpler way, so it’s not clear to me why Java still does this. Unlike ...

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So You Say You’re An Expert?


Whether through my recruiting endeavors or the private resume services I provide to job seekers, not a week goes by where I don’t see the word “expert” somewhere on a resume or cover letter. “Expert in $LANGUAGE” isn’t all that uncommon, and today the expression of expertise may also be depicted through a horizontal bar graph where several languages or concepts ...

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Getting Started with MapR Streams


MapR Streams is a new distributed messaging system for streaming event data at scale, and it’s integrated into the MapR converged platform. MapR Streams uses the Apache Kafka API, so if you’re already familiar with Kafka, you’ll find it particularly easy to get started with MapR Streams. Although MapR Streams generally uses the Apache Kafka programming model, there are a ...

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App Dev Cloud Stack – It’s all about the PaaS baby


This series started with the statement, what do you mean by “Can’t ignore the stack anymore?” When your background is application development, you have spent many hours, days and years perfecting your craft. You have not only learned languages and concepts, you have made it a point to learn to make good architectural decisions when pulling together the applications you ...

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Communities and Criticism


It would seem only logical that a major advantage of a community is access to criticism. Ok, yeah, that‘s a bad word. Let‘s back up. To perspective. Wait, what‘s the difference between those things? If someone has a different perspective on something that we have done, we immediately think that they: don‘t like us are mean are probably a troll ...

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JUnit 5 – Basics


Last week we’ve set up JUnit 5 to be able to write tests. So let’s do it! Overview This post is part of a series about JUnit 5: Setup Basics Architecture Conditions Injection … Most of what you will read here and more can be found in the emerging JUnit 5 user guide. Note that it is based on an ...

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