Big Data

Data+AI Summit 2020 – be Zen in your lakehouse

In case you missed it, last week was held the first Data+AI Summit (formerly Spark+AI Summit) and we had a chance to participate. The talks will be published online but if you don’t want to wait, take a shortcut and learn our key insights! TL;DR Are you wondering why that title? It summarizes the major announcements from a data engineering perspective. Apache Spark will become more Pythonic thanks to the Project Zen initiative, and very probably, it will work on top of a lakehouse architecture.…

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Archi & Techno

Terminal telekinesis

Tl;dr In my experience, software developers’ skills regarding tasks in a terminal range from desperately slow to impressively swift. I believe that, for a large part, this is caused by an abundance of articles not discussing the real problems software developers are dealing with daily. Namely, how to feel productive on a terminal, after using omnipotent integrated software environments for so long. This article aims at bridging this gap by sharing carefully selected tips that can, in my opinion, dramatically increase the terminal productivity of…

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Archi & Techno

The Google Assistant for Android developers – PART 2

This article follows a first article “The Google Assistant for Android developers - PART 1”. In the first article, we have discovered the “Solutions” part offered by Google by going through the making of a simple app. We have built an App Action allowing us to directly launch a specific feature of our app with a vocal command, then we improved it with the displaying of a Slice. Although really simple to build, we have quickly witnessed the limits of this part since it only…

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Big Data

Time series features extraction using Fourier and Wavelet transforms on ECG data

ABSTRACT This article focuses on the features extraction from time series and signals using Fourier and Wavelet transforms. This task will be carried out on an electrocardiogram (ECG) dataset in order to classify three groups of people: those with cardiac arrhythmia (ARR), congestive heart failure (CHF) and normal sinus rhythm (NSR). Our approach consists of using scaleogram (i.e. 2D representation of 1D extracted features) as an input to train a Neural Network (NN). We conducted the different tasks using python as a programming language. The…

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Archi & Techno

The Google Assistant for Android developers – PART 1

Everybody knows about the Google Assistant, available on most Android and iPhone devices. As for “Hey Siri”, the well known “Ok Google” has entered common language. We probably all have already used it at least once if only to try it. However, the scope of its field of action and implementation seems to be mysterious for us developers. At least, it was for me until recently. Is it only a mobile feature? Can we use it in our application? What are the possibilities of interactions?…

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Archi & Techno

Seven shades of Git

Tl;dr Every time I stumble upon a Git article on the web, it always talks about how to use it, instead of why I should use it. Wait, isn’t that obvious? We use Git for versioning our code and sharing it with others. This is what Version Control Software (VCS) is used for, afterall.  Thinking like this, it is easy to believe that you can Google your way through Git mastery by searching how-to’s every time you’re stuck on a specific Git-related problem. At least…

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Big Data

Accelerating NiFi flows delivery: Part 1

While working in different contexts with NiFi, we have faced recurring challenges of development, maintenance and deployment optimization of NiFi flows. Whereas the basic approach suggests to manually duplicate pipelines for similar patterns, we believe that an automated approach is relevant for production purpose when it comes to implementing a significant amount of ingestion flows relying on a limited set of patterns or, more simply, when it comes to deploying these flows on different environments of execution. The ability to reach the right level of…

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Archi & Techno

Cache me if you can – 2

Introduction - scope of the article This series of articles deals with caching in the context of HTTP. When properly done, caching can increase the performance of your application by an order of magnitude. On the contrary, when overlooked or completely ignored, it can lead to some very unwanted side effects caused by misbehaving proxy servers that, in the absence of clear caching instructions, decide to cache anyway and serve stale resources. In the first part of this series, we argued that caching is the…

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Archi & Techno

Android Material Components: Exploring MaterialShapeDrawable

Material Components is the (not so) new library made by the Material team to replace the old support design library. It provides components to apply Material Design in your application with ease. Among these components, you can find the famous FloatingActionButton, the CardView or the BottomSheet. But there are also some less known, nonetheless powerful, components. And one of them is the MaterialShapeDrawable.

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Archi & Techno

Comic – Infrastructure as Code (IaC)

Lire la BD en français Hello ! Deploying a new release to production is more complex than simply checking that the app's code functions correctly. We must also make sure that it will run correctly on the existing production servers, and with the production environment's infrastructure. And in order to do this, the Ops leave nothing to chance...!

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