Category Archives: Learning Big Data

Doing data science on my health data in R Studio – Part 1

Posted on December 21, 2018 by Marcel-Jan Krijgsman

Up to seven years ago my doctor would nag me every half year that I should lose some weight. Nagging didn’t work on me that much. What did work however was competition. I wanted to become faster in a bike … Continue reading →

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Check your /tmp on HDFS

Posted on December 19, 2018 by Marcel-Jan Krijgsman

If you have sensitive data on your Hadoop cluster, you might want to check /tmp on HDFS once a while to see what ends up there. /tmp is used by several components. Hive for example stores its “scratch data” there. … Continue reading →

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Making a Hertzsprung-Russell diagram from Gaia DR2 data with Elasticsearch

Posted on May 13, 2018 by Marcel-Jan Krijgsman

Elasticsearch was one of the open source products on my list to try out, ever since I got rejected for a couple of assignments as a consultant last year. Apparently it’s a popular product. But why do you need a … Continue reading →

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Building HDP 2.6 on AWS, Part 3: the worker nodes

Posted on April 10, 2018 by Marcel-Jan Krijgsman

This is part 3 in a series on how to build a Hortonworks Data Platform 2.6 cluster on AWS. By now we have an edge node to run Ambari Server, three master nodes for Hadoop name nodes and such. Now … Continue reading →

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I feel great when I study

Posted on April 7, 2018 by Marcel-Jan Krijgsman

When I started studying Hadoop, Python and machine learning in 2016, I found something out that I didn’t expect. I feel better when I study. When I finished another problem, exam or course, and I stepped outside the house to … Continue reading →

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Recovering your HDP 2.6.1 Sandbox on VirtualBox after a restart

Posted on November 17, 2017 by Marcel-Jan Krijgsman

If you’ve worked with the Hortonworks Data Platform 2.x sandbox of later versions in VirtualBox and made it shutdown rather vigorously, you might have noticed that you won’t get past this startup screen when you try to start it up … Continue reading →

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Tutorial: Let’s throw some asteroids in Apache Hive

Posted on November 14, 2017 by Marcel-Jan Krijgsman

This is a tutorial on how to import data (with fixed lenght) in Apache Hive (in Hortonworks Data Platform 2.6.1). The idea is that any non-Hive, non-Hadoop savvy people can follow along, so let me know if I succeeded (make … Continue reading →

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Hadoop High Availability In A Hurry – Part 2: YARN

Posted on July 24, 2017 by Marcel-Jan Krijgsman

If you don’t know a lot about YARN and why it’s called a data operating system, you’re in luck. I found it necessary to explain how YARN works before I could explain the solutions for high availability. At first YARN … Continue reading →

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Hadoop High Availability In A Hurry – Part 1: HDFS

Posted on June 26, 2017 by Marcel-Jan Krijgsman

I’ve been studying for a couple of hours how Hadoop high availability works, for the HDPCA exam. And now I’ve condensed that knowledge to a video on HDFS HA in just under 9 minutes. Enjoy!

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Certifying as HDP Certified Administrator

Posted on June 21, 2017 by Marcel-Jan Krijgsman

Let’s talk about certification. The thing by which you try to show potential employers and customers that you actually know what you are doing at work. My only experience up to last Tuesday with IT product-related certifications was with Oracle’s … Continue reading →

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