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What Is the Future of Data Warehousing?

There is no denying it – we live in The Age of the Customer. Consumers all over the world are now digitally empowered, and they have the means to decide which businesses will succeed and grow, and which ones will fail. As a result, most savvy businesses now understand that they must be customer-obsessed to succeed. They must have up-to-the-second ...

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Keep Server IPs In Apps

As a consequence of the Dyn attack many major websites were down, including twitter – the browsers could not resolve an IP address of the servers because the authoritative name server (Dyn) was down. Whether that could be addressed globally, I don’t know – there was an interesting discussion on reddit about my proposal to increase TTL – how the ...

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Understanding Connection Pooling

java-interview-questions-answers

1. Introduction Connection Pooling is a technique to boost application’s performance where N connections to the database are opened and managed in a pool. The application just asks for a connection, uses it and then drops it back to the pool. When the application demands for a connection, the ready connections are kept available to used in the pool. The pool manages ...

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How to Replicate Streaming Data Across Data Centers with MapR Streams

In this week’s Whiteboard Walkthrough Jorge Geronimo, Solutions Architect at MapR, explains how with a single line of code you can create a replica of a MapR data stream within the same cluster or to another cluster even in another part of the world. Jorge also describes multi master replication for streaming data and how MapR Streams’ unique capability for ...

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Crouching Supervisor, Hidden File Descriptor Setting

Here’s an interesting problem our team faced last month that was extremely infuriating. We were in the process of launching replacement haproxyinstances that are used to load balance to nodes in our RabbitMQ cluster. We’ve done this a lot of times before and set all the usual user settings required under limits.d to ensure proper file descriptors are allocated for ...

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Devoxx 2016 Part 1 – Conference Impressions

This is my report on my trip to Devoxx Belgium conference. My last visit to Belgium coincided with the publication of Java EE 7 Developer Book in 2013. Three years ago is long time in the technology. So what has changed in Belgium in the meantime? The threat level of security is the obvious thing, there were many army soldier ...

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Auto-Generate Optimized Java Class Specializations

If you visited JavaOne this year you might have attended my presentation on “How to Generate Customized Java 8 Code from your Database”. In that talk I showcased how the Speedment Open Source toolkit is used to generate all kinds of Java code using a database as the domain model. One thing we didn’t have time to go into though ...

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Banana Classifier with OpenCV on Android

Make Banana Recognition Great Again This post is about going from an idea to its implementation. The idea was to create an application for mobile phone that can detects cars. Now let’s see how it started and where I stand today. I’ll provide a brief description of the steps taken to this very day. Step 1. Google is Your Friend ...

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Interview to Erik Dietrich on Static Analysis and a data driven approach to refactoring

Erik Dietrich is a well known Software Architect with a long experience in consulting. His blog (DaedTech) is a source of thoughtful insights on software development. In particular I was very interested by his usage of static analysis and code metrics in his consulting work. I am myself a relatively young consultant and I thought it would be very valuable ...

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