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Neil Stevenson

Neil Stevenson

Solutions Architect

Neil is a solution architect for Hazelcast®, the world's leading open source in-memory data grid. In more than 25 years of work in IT, Neil has designed, developed and debugged a number of software systems for companies large and small.

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Running Apache Beam on Hazelcast Jet

Neil Stevenson
by Neil Stevenson

In June 2019, we announced the inclusion of Hazelcast Jet as a runner for Apache Beam. Now it’s time for an example showing how it’s done. As a bonus, it’s not “Word Count.” IoT Data The data we will use is a series of 2,000 GPS points and time offsets: # Latitude, Longitude, Time-Offset 45.417,8.179,1629 45.417,8.178,1630 […]

Calculation in Hazelcast Cloud

Neil Stevenson
by Neil Stevenson

This is an example showing one way you might connect to Hazelcast Cloud, and how you can harness its power for improved performance. As a problem, we’re going to calculate the spread of customer satisfaction, as the average doesn’t give enough insight. The example shows a custom domain model and server-side code execution. It shows […]

Hello JSON, Hello YAML and Goodbye XML!

Neil Stevenson
by Neil Stevenson

This is an example showing the use of YAML configuration, and populating a Hazelcast grid with data in JSON format that has been extracted from a traditional relational database. So the data goes from tables into “NoSQL” format. Hello YAML, Goodbye XML Hazelcast has many ways to be configured. Sensible defaults mean you don’t have […]

Hazelcast On Kubernetes Made Fairly Easy

Neil Stevenson
by Neil Stevenson

An step-by-step example to running Hazelcast on Kubernetes, the classic “Hello World” style beginners introduction. The sample includes instructions and screenshots for running on Mac. The process is essentially the same for Windows or Linux, although for Windows you will need a version that supports the appropriate networking (Windows 10 Professional not Windows 10 Home, […]

Session Analysis for an Online Shop

Neil Stevenson
by Neil Stevenson

In this example. we’ll look at doing some analytics on an online shop to gain insights into customer behaviour. Background Most online shops follow a similar pattern in terms of the customer experience. Users are presented with a catalogue of products on a browser page or mobile application, and may make selections from these. Items […]

Times Table with JCache 1.1

Neil Stevenson
by Neil Stevenson

An example showing Hazelcast support for JCache 1.1. As a maintenance release to the JSR 107 Java Caching Specification, JCache 1.1 was released on 16th December 2017. This is now supported by Hazelcast, from release 3.9.3 onwards, released on 16th February 2018. This example allows you to build either version, to compare the differences. Mainly […]

Hazelcast for Go Getters

Neil Stevenson
by Neil Stevenson

Know “Go” but don’t know about “Hazelcast” ? Know “Hazelcast” but don’t know about “Go” ? This tutorial gets you going with both together, in a follow-along style, assuming you only know one of the two. Hello World Naturally, this is a simple example, “Hello World”, the bare minimum. We’ll start by installing the tools, […]

Projections, Joins and Partition Awareness

Neil Stevenson
by Neil Stevenson

This example shows some of the newer features of querying, a way that joins can be achieved, and shows the pros and cons of partition aware routing. Although mainly an Hazelcast IMDG example, Hazelcast Jet puts in a guest appearance to implement the join. Background – Partitioning The most commonly used data structure in Hazelcast […]

Priority Queueing Using the SPI

Neil Stevenson
by Neil Stevenson

Hazelcast provides distributed queues, an implementation of java.util.concurrent.BlockingQueue. However, an implementation of java.util.concurrent.PriorityBlockingQueue is not yet provided. In this example, we’ll see how to write this yourself, using Hazelcast’s SPI (Service Provider Interface). (Note: this is just an example, deliberately simplified. Attention is drawn to some extra steps to make this production quality.) Recap, “SPI“ […]

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