David Worms

About David Worms

Passionate with programming, data and entrepreneurship, I participate in shaping Adaltas to be a team of talented engineers to share our skills and experiences.

Merging multiple files in hadoop

This is a command I used to concatenate the files stored in Hadoop HDFS matching a globing expression into a single file. It use the "getmerge" utility of "hadoop fs" but contrary to "getmerge", the final merged file isn't put into the local filesystem but inside HDFS. Here's how it look like echo '' > [...]

By |2017-11-21T20:13:25+00:00July 12th, 2013|Categories: Big Data|0 Comments

Maven 3 behind a proxy

Maven 3 isn't so different to it's previous version 2. You will migrate most of your project quite easily between the two versions. That wasn't the case a fews years ago between versions 1 and 2. However it took me some time to find out how to properly configure my proxy settings and this article [...]

By |2017-11-21T20:16:01+00:00July 11th, 2013|Categories: Hack|0 Comments

The state of Hadoop distributions

Apache Hadoop is of course made available for download on its official webpage. However, downloading and installing the several components that make a Hadoop cluster is not an easy task and is a daunting task. Below is a list of the main distributions including Hadoop. This follows an article published a few days ago about [...]

By |2018-06-05T22:37:15+00:00July 11th, 2013|Categories: Big Data|0 Comments

Definitions of machine learning algorithms present in Apache Mahout

Apache Mahout is a machine learning library built for scalability. Its core algorithms for clustering, classfication and batch based collaborative filtering are implemented on top of Apache Hadoop using the map/reduce paradigm. It contains various algorithms which we are defining below. Each of them may define multiple implementations. A mojority but not all of the [...]

By |2018-06-05T22:37:16+00:00July 8th, 2013|Categories: Big Data|0 Comments

About the new BSD license and its difference with other BSD licenses

As a non restrictive open source license, the “new BSD license” is a commonly used license accross the Node.js community. However, this is only one of the BSD license available along the original “BSD license” and the “Simplified BSD License” or “FreeBSD License”. It may seems confusing as to how you must choose your license [...]

By |2017-11-21T20:16:35+00:00July 8th, 2013|Categories: Data Governance|0 Comments

Oracle and Hive, how data are published?

In the past few days, I've published 3 related articles: a first one covering the option to integrate Oracle and Hadoop, a second one explaining how to install and use the Oracle SQL Connector with HDFS and a third one explaining how to install and use the Oracle SQL Connector with Hive. Those last two [...]

By |2018-06-05T22:37:17+00:00July 6th, 2013|Categories: Big Data|0 Comments

Tutorial for creating and publishing a new Node.js module

In this tutorial, I provide complete instructions for creating a new Node.js module, writing the code in coffee-script, publishing it on GitHub, sharing it with other Node.js fellows through NPM, testing it with Mocha, Should and JsCoverage and integrating it to travis. Because of its simplicity, this module could also be used as a scaffolding [...]

By |2018-06-05T22:37:18+00:00July 4th, 2013|Categories: Node.js|0 Comments