Author Archives: tim

The future of AngularJS and Angular 2

Posted on September 6, 2017 by tim

It has been fun developing AngularJS applications. It was the first complete framework that was both a higher level of abstraction than jQuery and easy enough (not “easy”, per se) to learn and use. You can even play with my … Continue reading →

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Should REST and microservice APIs be Versioned?

Posted on September 6, 2017 by tim

This is a very lively topic. The starting point for these questions must be: in our world (enterprise grade computer science), what isn’t versioned? The answer to that is: everything is versioned. Therefore, the actual question splits into two parts: … Continue reading →

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Is Spring RestTemplate Thread Safe

Posted on August 6, 2017 by tim

Is Spring RestTemplate Thread Safe? The only correct answer to this question is: No A quick look at the source (the link is tied to a specific version so the line number is always correct) on line 230 shows the … Continue reading →

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Hadoop Terasort VirtualBox benchmarks

Posted on August 6, 2017 by tim

Setup: 3-node hadoop (hdp v2.6.1), installed via Ambari 2.5.1 and running in VirtualBox 5.1 on one physical machine. The terasort is traditionally run on 1 terabyte of random data (SIZE=10,000,000,000). In 2008, Yahoo! ran terasort on 1TB of data in … Continue reading →

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Secret Share 1.4.3 on Maven Central

Posted on July 8, 2017 by tim

Secret Share in Java on Maven Central Just completed a release of the Secret Share in Java project to Maven Central. Search for it using search.maven.org. Or, go to SecretShare-1.4.3 directly. GroupId: com.tiemens ArtifactId: secretshare Version: 1.4.3 This release adds … Continue reading →

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Real World Debugging Exercise

Posted on December 15, 2016 by tim

Just completed the Real World Debugging Exercise. It is a static page on this site (just like the Lot Area Calculator).

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VirtualBox USB Flash for ZFS

Posted on November 24, 2016 by tim

To set up your USB Flash drives as pass-through in VirtualBox, here is what you can do. Next, plug in your flash drive and record its device. For me, it was /dev/sde. Look in /var/log/syslog, or dmesg output, for the … Continue reading →

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ZFS Flash Drives

Posted on November 20, 2016 by tim

As an experiment, I created a small (8GB) ZFS volume in a mirror configuration using two 8GB USB Flash drives. The purpose was to put “small, but really important things” on this storage system. It actually ended up being two … Continue reading →

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iptables flush and ssh

Posted on September 21, 2016 by tim

Fun lesson from today: don’t blindly clear/flush your iptables. If you are remotely managing a system, then make sure you run this: sudo iptables -P INPUT ACCEPT sudo iptables -P FORWARD ACCEPT sudo iptables -P OUTPUT ACCEPT before you run … Continue reading →

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Kids Game Build

Posted on May 28, 2016 by tim

The goal of this machine was to replace the highly unreliable kids computer (Portable Power Build). First the GPU went, then the HDD started showing errors. Finally the MB voltage started to act up. The net result was that the … Continue reading →

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