March 2018 Book Recommendations
My favorite reads of the past few weeks.
Author: Manuel Kießling
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How Cassandra's inner workings relate to performance
At Galeria.de, we learned the hard way that it's critical to understand the inner workings of the distributed masterless database Cassandra if one wants to experience good performance during reads and writes. This post describes some of the details of how Cassandra works under the hood, and shows how understanding these details helps to anticipate which use patterns work well and which don't.
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Scala Play2: Tolerant JSON body parsing with dedicated error handling
For one of my current projects, I needed to gain full control over the request-body-to-case-class-object transformation of my Scala Play2 controller action. Here's the solution I came up with.
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Scala: Traversing a graph in a functional way
I recently played around with graphs and tried to implement Depth-First Search in a functional and recursive way. Here is what I learned.
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Puppet: Evaluating defined types for each element in an array in a non-brittle way
Passing an array when declaring a defined type automatically evaluates the defined type once for each element of the array, but care must be taken if no array is declared in the Hiera structure for a given target system.