About the Author

Neil Stevenson

Neil Stevenson

CTO, Hazelcast Platform

Neil is a solution architect for Hazelcast®, is the industry leading in-memory computing platform. In more than 30 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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Experiences with Change Data Capture

Neil Stevenson
by Neil Stevenson

In a previous blog post, Designing an Evergreen Cache with Change Data Capture, Nicolas describes “one-way” change data capture (CDC). It is a one-way process. In Nicolas’ post, the database copy can change and CDC pushes the change to Hazelcast to align the two copies of the data. Let’s take this a stage further, with “two-way” […]

How Much Memory Do I Need for My Data ?

Neil Stevenson
by Neil Stevenson

“How much memory do I need for my data?” This is a pretty common question at the start of Hazelcast projects. Load it and measure it is one answer, which is accurate but not exactly popular. So, let’s take a quick look at why capacity planning isn’t as simple as it seems, by stepping through […]

Where Are My Keys ?

Neil Stevenson
by Neil Stevenson

It’s useful to understand how, why and where Hazelcast stores your data in the grid. What happens is what you really need, but it won’t necessarily be what you first think you want. We’ll explore this in this blog by putting some number keys in a map, a common starting point and source of confusion. […]

Jet Calculates Pi Using Python

Neil Stevenson
by Neil Stevenson

Today is PI DAY! Obviously, Pi has rather more than 2 decimal places. To have some fun, let’s use Jet to drive multiple Python workers to calculate Pi with increasing accuracy. A tiny bit of mathematics Pi is the ratio of a circle’s radius to its circumference. It’s 3.14. It’s 3.1416. It’s 3.14159266 or whatever. It […]

Bitcoin’s Death Cross

Neil Stevenson
by Neil Stevenson

Let’s start off the New Year with a fun code example! This example shows how Jet is used to spot the dramatically-named Death Cross for the price of Bitcoin, which is an indication to sell, Sell, SELL!. The idea here is that we could automatically analyze stock market prices and use this information to guide […]

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, […]

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