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Nils Kilden-Pedersen


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Queries and Aggregations w/ Scala, part 2

by Nils Kilden-Pedersen

As we saw in part 1, it took 2+ minutes, on my laptop, to run an aggregation across 6+ million crime cases. However, since Hazelcast is cluster library, it only makes sense to take advantage of that. Let’s run this on a 3-node cluster. That will require a few code changes to CrimeNode: First, we […]

Queries and Aggregations w/ Scala, part 1

by Nils Kilden-Pedersen

In this post we’ll take a look at the built-in aggregations in the Scala API. I was looking at publicly available data sets to run some analysis on, and a good choice seemed the Chicago Crime statistics, a data set that includes all crime cases since 2001. I chose the CSV download, which unfortunately is […]

Introducing Hazelcast Scala API with Aggregations

by Nils Kilden-Pedersen

A pre-release alpha version of the Scala API for Hazelcast has been released and is available on Github. It’s a “soft” API, i.e. it expands the Java API rather than replace it. The Scala API also adds built-in distributed aggregations, and IMap join capability. The Scala API targets version 3.6 of Hazelcast. Key features The […]

Enumerable Ways to Serialize

by Nils Kilden-Pedersen

With Hazelcast there’s a plethora of ways to do serialization. Personally, I prefer to use either ByteArraySerializer or StreamSerializer, for a couple of reasons: They facilitate separation of concerns, i.e. the serialization code is separate from the class itself. Because they facilitate separation of concerns, there’s no required dependency on Hazelcast in the actual classes […]


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