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Category Archives: Learning Big Data
R Studio: Doing data science on my health data – Part 1
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
Posted in Learning Big Data, Weird experiments
Tagged Big Data, ggplot2, health data, R Studio, Udemy
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Check your /tmp on HDFS
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
Making a Hertzsprung-Russell diagram from Gaia DR2 data with Elasticsearch
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
Posted in Learning Big Data, NoSQL
Tagged 2001 A Space Odyssey, ElasticSearch, Frank Kane, Gaia, Hertzsprung-Russell diagram, Kibana, Logstash, Udemy, Vega
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Building HDP 2.6 on AWS, Part 3: the worker nodes
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
Posted in Howto, Learning Big Data
Tagged Amazon Web Services, AWS, cloning nodes, Hadoop, HDP, Hortonworks Data Platform, Ubuntu Server, worker nodes
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Hadoop High Availability In A Hurry – Part 2: YARN
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
Posted in Apache Products for Outsiders, Learning Big Data
Tagged Application Master, Container, Hadoop, Node Manager, Resource Manager, YARN, ZooKeeper
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Hadoop High Availability In A Hurry – Part 1: HDFS
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!
Posted in Apache Products for Outsiders, Learning Big Data
Tagged DataNode, edits file, Fencing, fsimage, Hadoop, HDFS, High availability, JournalNode, NameNode, Split brain, ZKFC, ZooKeeper
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Certifying as HDP Certified Administrator
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
Posted in Learning Big Data
Tagged certification, HDPCA, Hortonworks, Hortonworks University
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