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Testing Spark Streaming: Integration testing with Docker Compose

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In the first post of this series, we saw how to unit test Spark Streaming operations using Spark Testing Base. Here we’ll see how to do integration testing using Docker Compose. What is Integration testing We previously saw a discussion about unit and integration testing. Again, as we want to keep the post focused, we’ll work with a definition of ...

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SpringOne Platform 2016 Retrospective

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I recently wrapped up attending the SpringOne Platform conference in Las Vegas. This was my first time attending SpringOne; it was an experience listening to talks and having conversations with some of the top experts in software development. If you didn’t attend SpringOne, you’ll definitely want to read this post. We’ll go over these four themes and how to potentially ...

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How I Chose my Replacement for Parse.com Part 2

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You probably recently received the “Next Steps from the Parse Team” newsletter in your inbox in which you were urged to take immediate action as it pertains to migrating your Parse.com-hosted apps. Or at least, you’re aware of the ultimate January 28, 2017 deadline for migrating your apps. While you should take such reminders seriously, there’s no need to panic. ...

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Remembering to Reset Thread Context Class Loader

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I’m having a difficult time thinking of anything I like less about working with Java than working with class loaders. This is particularly true when working with application servers or OSGi where the use of multiple class loaders is prevalent and the ability to use class loaders transparently is reduced. I agree with the OSGI Alliance Blog post What You ...

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Testing Spark Streaming: Unit testing

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There is enough evidence to prove the importance of automated testing. Projects in new fields often neglect automated testing, as the domain itself steals the attention of the developers. However, lack of testing implies ‘laugh now, cry later’. Some of the tools around Big Data space have been architected around testability or, at least, the community has taken care of ...

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Distributed Application Bundles (Tour Around Docker 1.12 Series)

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The new Swarm bundled in Docker 1.12+ is a vast improvement compared to the old orchestration and scheduling. There is no more the need to run a separate set of Swarm containers (it is bundled in Docker Engine), failover strategies are much more reliable, service discovery is baked in, the new networking works like a charm, and so on. The ...

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How to avoid underestimating complexity

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People involved in software projects would say that software development is about understanding complexity. What is complexity? Complexity is easy to define at a high level, but people get vague when pressed for a precise definition.  Let’s see if we can quantify the problem, then come back and define it.             Assume we need to ...

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Update DynamoDB Items with Java

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On a previous post we proceeded into inserting items to DynamoDB using Java. DynamoDB also supports updating items. We will use the Login table for the update examples. When issuing an update you must specify the primary key of the item you want to update. public void updateName(String email,String fullName) { Map<String,AttributeValue> attributeValues = new HashMap<>(); attributeValues.put("email",new AttributeValue().withS(email)); attributeValues.put("fullname",new AttributeValue().withS(fullName)); ...

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Ye Olde Monolith

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As a professional software engineer, you probably have encountered an architectural stumbling block known as a MONOLITH#1. A monolith is essentially a single tier application in enterprise architecture. Forget about the traditional break-down of Java EE application, where they break down an Uber-WAR file into presentation, business-logic and database tiers. That is just gloss over our very eyes, a single ...

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