All posts

GraalVM native image can be used to create tiny Docker images as described here.

Posted by Christopher Batey on May 28, 2020 ·

Building small Docker images when using Java is hard. Even with Alpine and a cut...

Posted by Christopher Batey on May 28, 2020 ·

In this article we’ll explain how cpu_shares are used when setting Kubernetes requests and limits....

Posted by Christopher Batey on May 28, 2020 ·

In this article we’ll explain CPU shares, so you can understand how to set them...

Posted by Christopher Batey on May 28, 2020 ·

In this article we’ll explain CPU quota and period, so you can understand how to...

Posted by Christopher Batey on May 28, 2020 ·

Threeish years ago I worked with JVMs inside Docker running in Kubernetes. I discussed some...

Posted by Christopher Batey on November 17, 2018 ·

This is the start of a set of blog posts to encourage and educate developers...

Posted by Christopher Batey on July 08, 2017 ·

In mainstream OO you often come across a layered or hexagonal architectures with layers such...

Posted by Christopher Batey on July 08, 2017 ·

If you haven’t read the first article in the series I suggest you do so...

Posted by Christopher Batey on July 08, 2017 ·

To learn about flame graphs and perf with Java see Brendon Gregg’s post and a...

Posted by Christopher Batey on November 04, 2016 ·

I’m a developer and now accidental platform person who now manages a lot of servers...

Posted by Christopher Batey on November 01, 2016 ·

One of the first things I check when looking at a new dashboard is for...

Posted by Christopher Batey on September 11, 2016 ·

I previously posted about Cassandra UDFs. It is worth reading that post before carrying on...

Posted by Christopher Batey on April 14, 2016 ·

Cassandra 2.1 has secondary indexes, Casandra 3.0 introduced Materialized views. Now Cassandra 3.4 has a...

Posted by Christopher Batey on April 13, 2016 ·

User defined types were introduced in Cassandra 2.1.

Posted by Christopher Batey on April 11, 2016 ·

As of version 2.2 Cassandra supports user defined functions. I wrote about these a while...

Posted by Christopher Batey on April 11, 2016 ·

Cassandra uses a lot of thread pools under the covers. You can get information about...

Posted by Christopher Batey on April 08, 2016 ·

Cassandra exposes a lot of metrics. Lets have alook at them in a very rough...

Posted by Christopher Batey on April 08, 2016 ·

Last time we looked at Cassandra’s ClientRequest metrics. However they only take you so far...

Posted by Christopher Batey on April 08, 2016 ·

Cassandra records a set of ClientRequest metrics that record min, max, mean as well as...

Posted by Christopher Batey on April 06, 2016 ·

I spent far too much of my life on a computer using the default terminal...

Posted by Christopher Batey on March 11, 2016 ·

An incomplete list of talks that I enjoyed. I'll add more and summaries at some...

Posted by Christopher Batey on August 05, 2015 ·

Version 0.9.1 has a few nice features and has reduced a lot of technical debt....

Posted by Christopher Batey on July 31, 2015 ·

Disclaimer: C* 3.0 is not released yet and all these examples are from a branch...

Posted by Christopher Batey on July 07, 2015 ·

My last post was on UDAs in C* 2.2 beta. C*2.2 is now at RC1...

Posted by Christopher Batey on July 03, 2015 ·

Disclaimer: all this was against 2.2-beta so the syntax may have changed.

Posted by Christopher Batey on May 28, 2015 ·

I am a huge test first advocate. Since seeing Martin Thompson speak I am now...

Posted by Christopher Batey on May 10, 2015 ·

Downloading and installing Cassandra:

Posted by Christopher Batey on May 04, 2015 ·

Last week I gave a webinar on avoiding anti-patterns in Cassandra. It was good fun...

Posted by Christopher Batey on March 27, 2015 ·

I work across a desktop and two laptops so reproducible builds mean a lot to...

Posted by Christopher Batey on March 17, 2015 ·

If you're going down the microservice rabbit whole using frameworks like Spring Boot and Dropwizard...

Posted by Christopher Batey on March 16, 2015 ·

By far the most common question I get asked when talking about Cassandra is once...

Posted by Christopher Batey on March 13, 2015 ·

I've previously blogged about other anti-patterns: Distributed joins Unlogged batches

Posted by Christopher Batey on March 12, 2015 ·

I previously blogged about a Cassandra anti-pattern: Distributed joins. This commonly happens when people move...

Posted by Christopher Batey on February 18, 2015 ·

This is my second post in a series about Cassandra anti-patterns, here's the first on...

Posted by Christopher Batey on February 09, 2015 ·

Stubbed Cassandra (Scassandra) is an open source test double for Cassandra. Martin Fowler has a...

Posted by Christopher Batey on February 03, 2015 ·

I recently started working with Kafka. The first thing I do when start with a...

Posted by Christopher Batey on February 03, 2015 ·

There’s a reason when you shard a relational databases you are then prevented from doing...

Posted by Christopher Batey on February 02, 2015 ·

A lot of people are getting excited about Apache Spark. The release of the open...

Posted by Christopher Batey on January 26, 2015 ·

In my previous post on Cassandra and Spark I showed how to get a development...

Posted by Christopher Batey on January 21, 2015 ·

I have been using Wiremock as my preferred HTTP test double for some time now....

Posted by Christopher Batey on January 06, 2015 ·

I play with a lot of different technologies and I like to keep my work...

Posted by Christopher Batey on December 22, 2014 ·

Cassandra's normal use case is vast number of small read and write operations distributed equally...

Posted by Christopher Batey on December 08, 2014 ·

Yesterday was the EU Cassandra Summit in London, 1000 crazy Cassandra lovers. I've only just...

Posted by Christopher Batey on December 05, 2014 ·

The LJC conference is a yearly event for Java/JVM developers in London to get together...

Posted by Christopher Batey on December 01, 2014 ·

Had a great time giving a talk on building fault tolerant micro services at skills...

Posted by Christopher Batey on November 07, 2014 ·

One of the simplest sounding requirements that you might get as a software engineer is...

Posted by Christopher Batey on October 21, 2014 ·

I've previously blogged about Hystrix/Tenacity and Breakerbox. The full code and outline of the example...

Posted by Christopher Batey on August 23, 2014 ·

Yesterday I gave a talk on how to test Cassandra applications using Stubbed Cassandra at...

Posted by Christopher Batey on August 21, 2014 ·

RabbiqMQ is a AMQP broker with an interesting set of HA abilities. Do a little...

Posted by Christopher Batey on August 07, 2014 ·

Applications are becoming increasingly distributed. Micro service architecture is the new rage. This means that...

Posted by Christopher Batey on August 04, 2014 ·

Two of the top AMQP brokers are RabbitMQ and QPID. Which one is for you?...

Posted by Christopher Batey on July 31, 2014 ·

I am currently doing a proof of concept with Spark and Cassandra. I quickly need...

Posted by Christopher Batey on July 10, 2014 ·

So you're tasked with building a service that facades your company's legacy user management system....

Posted by Christopher Batey on June 15, 2014 ·

A couple of years ago I am not sure when interviewing candidates that I would...

Posted by Christopher Batey on June 15, 2014 ·

One thing I found a little baffling when I started using spring boot was that...

Posted by Christopher Batey on June 13, 2014 ·

In my first post about unit testing Java applications that use Cassandra you had to...

Posted by Christopher Batey on June 07, 2014 ·

I often get asked what is the best method for unit and and integration testing...

Posted by Christopher Batey on June 04, 2014 ·

Scassandra (Stubbed Cassandra) is a new open source tool for testing applications that interact with...

Posted by Christopher Batey on May 24, 2014 ·

My first article on Scassandra introduced what it is and why I've made it. This...

Posted by Christopher Batey on May 24, 2014 ·

I like to test the HTTP portion of the RESTful web services I build in...

Posted by Christopher Batey on February 14, 2014 ·

I've blogged previously about testing messages sent back to the sender and to a child...

Posted by Christopher Batey on February 11, 2014 ·

Recently I was writing integration tests for a library that returned futures. I wanted simple...

Posted by Christopher Batey on February 06, 2014 ·

I previously blogged about testing messages sent back to the sender. Another common scenario is...

Posted by Christopher Batey on February 05, 2014 ·

A common pattern when using actors is for actor A to send a message to...

Posted by Christopher Batey on January 14, 2014 ·

Update your apt source list with the following:sudo vim /etc/apt/sources.list #Add at the bottomdeb http://www.apache.org/dist/cassandra/debian...

Posted by Christopher Batey on October 02, 2013 ·

I posted some time ago about installing Cassandra on Mac OSX. Admittedly I generally use...

Posted by Christopher Batey on October 01, 2013 ·

The Datastax Java Driver for Cassandra exposes its strategy for retrying via the following interface:...

Posted by Christopher Batey on October 01, 2013 ·

Presenter: Johnny Miller Who is he? Datastax Solutions Architect Where? Skills matter exchange in London I went...

Posted by Christopher Batey on September 25, 2013 ·

Get hold of a collection object using something like this: scala> val collection = MongoClient()("test")("messages")...

Posted by Christopher Batey on September 22, 2013 ·

The officially supported Scala driver for Mongo is Casbah. Cashbah is a thin wrapper around...

Posted by Christopher Batey on September 20, 2013 ·

Git is great. The output from git log is not!One of my favourite tools to...

Posted by Christopher Batey on September 14, 2013 ·

Having investigated a few options I have decided on SLF4J + Logback + Grizzled. The...

Posted by Christopher Batey on September 14, 2013 ·

When starting out with Scala/SBT I very quickly ran into perm gen issues followed by...

Posted by Christopher Batey on September 01, 2013 ·

http://www.amazon.co.uk/Driving-Technical-Change-People-Convince/dp/1934356603 Author: Terrence Ryan http://terrenceryan.com/about/ Before reading a technical book I tend to look at...

Posted by Christopher Batey on August 31, 2013 ·

Coming at Groovy from a Java background it wasn't long before I wanted to see...

Posted by Christopher Batey on August 18, 2013 ·

I've been moving my projects from Maven to Gradle and it has given me my...

Posted by Christopher Batey on August 16, 2013 ·

One part of being a software engineer that I used to enjoy was the satisfaction...

Posted by Christopher Batey on August 15, 2013 ·

I'm extremely keen and enthusiastic. When I'm working, if there is someone who knows more...

Posted by Christopher Batey on August 15, 2013 ·

What is replication?Most databases offer some way to recover data in the event of hardware...

Posted by Christopher Batey on August 08, 2013 ·

Cassandra and MongoDB are two of the more popular NoSQL databases. I've been using Cassandra...

Posted by Christopher Batey on July 29, 2013 ·

Yesterday I went to see Uncle Bob at the Skills Matter Exchange in London. Having...

Posted by Christopher Batey on July 09, 2013 ·

I often find my self having to mock iterable objects. At times I've created a...

Posted by Christopher Batey on June 01, 2013 ·

Cassandra is fantastic for storing large amounts of data, and as of 1.2/CQL3 working with...

Posted by Christopher Batey on May 25, 2013 ·

I've recently posted some more tips on using Cassandra on Mac OSX: Cassandra on Mac If...

Posted by Christopher Batey on May 24, 2013 ·

The first section of this book introduces you to Clojure - mainly how the read...

Posted by Christopher Batey on April 05, 2013 ·

The LJC book club is moving on to the book Functional Programming for the Object...

Posted by Christopher Batey on April 04, 2013 ·

For the past two and a half years I have worked primarily on standalone Java...

Posted by Christopher Batey on February 20, 2013 ·