On Wed, Sep 2, 2015 at 10:35 PM, David Miller wrote:>> Another merge window, another set of networking changes. I've heard> rumblings that the lightweight tunnels infrastructure has been voted> networking change of the year... and others say that the…
Update August 2018: A newer, more complete introduction to React’s fundamentals is available at my course “React (without the buzzwords)”. It uses the latest version of React, and covers many topics that “Learn Raw React” is missing, including component…
On June 1, 2015 Baidu -the biggest search engine in China- launched a new cloud service: Free OCR API (百度OCR文字识别). The catch? The documentation is in Chinese only. Thus, even so the launch was already three months ago, I could not locate a single English…
Copyright © 2019 - K Harrison Privacy and Cookies Terms of Use, I did not think I would be writing about App Transport Security two weeks running. Last week I wrote up my notes on how I was debugging ATS. I was testing the Twitter search API which uses…
This post was done in partnership with The Wirecutter, a buyer's guide to the best technology. Read the full article here. We spent 15 hours testing a total of 13 iPad styluses with a graphic designer and independently arrived at the same conclusi...
A Password storage scheme that prevents an attacker from cracking passwords individually. Password database disclosures have caused companies billions of dollars in damages. Typically a password server securely obtains a password from the user, performs…
Last year, the Electronic Frontier Foundation along with Mozilla and Cisco launched an initiative called "Let's Encrypt" that promised to hand out free certificates anyone can use. Today, the team has released its first one -- it's only available t...
A super small library to help you map and filter arrays with async operations. The only hard dependency is Promise so it needs to be present some how in your project (polyfill or native). Compatible with NodeJS, CommonJS, AMD and Browser Globals. $ npm…
Sign in Sign up GitHub is home to over 31 million developers working together to host and review code, manage projects, and build software together. Sign up Use Git or checkout with SVN using the web URL. Want to be notified of new releases in …
Use this tutorial as a guide to learn HTML5 and CSS3. Each unit contains an annotated lesson that can assist you in developing your Web Development skills. This has the em tag This text has the strong tag /* CSS3: Styles */ .border-radius{ …
Panic didn’t conceive the original incarnation of Status Board for its customers. Developed in 2010 as a tidy way to keep track of support queries and development projects, it was a essentially a specialized webpage for employees, projecting a continuously…
Although it's pretty easy to hook up a Raspberry Pi to a screen using its HDMI port, it's not exactly the most portable of solutions (especially if there isn't a TV or monitor around). The Raspberry Pi Foundation recognized this, so it set about fi...
Recommended Reading highlights the best long-form writing on technology and more in print and on the web. Some weeks, you'll also find short reviews of books that we think are worth your time. We hope you enjoy the read. Evolving the Google Ident...
In my last post about Amazon EC2 Container Service (Amazon ECS), I discussed the two key components of running modern distributed applications on a cluster: reliable state management and flexible scheduling. Amazon ECS makes building and running…
After some recent work with systemd I’ve realized it’s power and I can come clean that I am a fan. I realize that there are multitudes of posts out there with arguments both for and against ... The post Percona Toolkit and systemd appeared first on MySQL…
Booking.com, one of the world’s leading e-commerce companies, helps travels book nearly 1 million rooms per night. Established in 1996, Booking.com B.V. guarantees the best prices for any type of property, from small, family-run bed ... The post…
Perhaps you'd like to mirror your iPad or iPhone screen on your 60-inch HDTV, but you don't want to buy an Apple TV right now because a new one is just around the corner. If you already have one of those $35 all-purpose tiny computing devices called a…
This is my blog about things related to Sage.
Copyright © 2019 - K Harrison Privacy and Cookies Terms of Use, Code coverage tools are a useful way to find untested code in a project but getting them to work with Xcode was a real pain. Xcode 7 now has code coverage fully integrated making it simple…
A collection of loading animations written entirely in css. Each animation is limited to a small subset of css properties in order to avoid expensive painting and layout calculations. I've posted links below to some fantastic articles that go into this in…
At WWDC 2015 we announced that iOS 9 will support IPv6-only network services. All apps submitted to the App Store must support IPv6 starting in early 2016. To make sure your app is compatible, use the networking frameworks (e.g., “NSURLSession”), avoid use…
This is a brief introduction to using Promises in JavaScript, primarily aimed at frontend developers. See here for a Chinese translation. A Promise is a programming construct that can reduce some of the pains of asynchronous programming. Using Promises…
So you learned React. So you added ES6 integration. So you got good at abstracting your code into components. So you…stop. We don’t care. Just because you learned a solid framework with some good use cases does not make you a genius. And it DEFINITELY…
a definition of this new architectural term The term "Microservice Architecture" has sprung up over the last few years to describe a particular way of designing software applications as suites of independently deployable services. While there is no…
Never run out of disk again The shared file system that scales automatically, with unlimited storage and high performance. Never run out of disk again The shared file system that scales automatically, with unlimited storage and high performance. …
Thank you for attending my July 22 webinar titled “Advanced Query Tuning in MySQL 5.6 and 5.7” (my slides and a replay available here). As promised here is the list of questions and my answers ... The post Advanced Query Tuning in MySQL 5.6 and MySQL 5.7…
By Spencer Blackman, Entrepreneur Contributor and Primary Care Physician at One Medical Group Anyone who's ever worked long hours in an office knows that it can be a challenge to stay healthy. And all that time spent sitting doesn't help matters....
Storage. Everyone needs it. Whether your data is in MySQL, a NoSQL, or somewhere in the cloud, with ever-growing data volumes – along with the need for SSDs to cut latency and replication to provide ... The post The language of compression appeared first…
Most web based tech startups are deploying to cloud hosted Linux machines. At the same time, only a small percentage of engineers actually run Linux on their development desktops. Enter Vagrant, an easy way to provision local Linux development environments…
Across disciplines of design, whether it's physical architecture, graphic design or software design - ideas, patterns and existing concepts are constantly reused and built on top of. The strongest fundamental design principles can cross-over between…
SSL stands for Secure Sockets Layer. An SSL certificate encrypts the data that is sent and received by the client without the possibility of someone reading the data in the middle, mostly known as man in the middle attacks. In this tutorial, we will…
Here at CloudFlare we are heavy users of the github.com/miekg/dns Go DNS library and we make sure to contribute to its development as much as possible. Therefore when Dmitry Vyukov published go-fuzz and started to uncover tens of bugs in the Go standard…
Pulsar applications are built on top of pulsar concurrent framework and are located in the pulsar.apps module.
Kristoffer over at rpsychologist.com wrote a really nice tutorial on getting up to speed with maps in R. It looked something like this. Felt a little left out, so I decided to make a port in Python. You can follow along below or if you prefer this as an…
I work in New York City, and I live in a micro-studio. The apartment offers Wi-Fi, but unfortunately, it has a very low bandwidth and is often unreliable. I also travel frequently and I spend a lot of my time on trains, on airplanes, and in hotels that…
Here at HumanGeo we use a lot of Python, and it is tons of fun. Python is a great language for writing beautiful and functional code amazingly fast, and it is most definitely my favorite language to use both privately and professionally. However, even…
rsync.net now supports ZFS send and receive over SSH If you're not sure what this means, our product is Not For You. In 2012 rsync.net transitioned to ZFS as the base of it's cloud storage platform.[1] In addition to enhanced data safety and…
This month’s theme for The Hustle is people who game the system. This is the last of the weekly series. I moved to America four years ago, when I was 22. Since then, I’ve co-founded two startups that have raised ~$90 million in venture capital and have…
If you like this tool, please cite our works: Bartoli, De Lorenzo, Medvet, Tarlao, Inference of Regular Expressions for Text Extraction from Examples, IEEE Transactions on Knowledge and Data Engineering (TKDE), 2016 The source code is available on…
This is the second post of a series about Raspberry PI 2 BigData cluster case. From Raspberry PI 2 Cluster Case pt1, I drew up a rough sketch with certain goals I set out to. They are, Able to fit in 6 RPI2 in a small, contained volume. Has to be…
I consider myself very lucky for contributing to the open source. For me OSS software is not just a license: it means transparency in the development process, choices that are only taken in order to improve software from the point of view of the users,…
The amazing and intimidating thing is that there are a myriad of challenges in UI & UX Design, and exponentially more potential solutions. The best kinds of solutions are ones that can be seamlessly integrated into the current tools of choice, and those…
Recently we published an interactive map that visualizes where the population in Europe grows and where it declines. It is a very detailed map with 119.406 colored polygons. You can hover each of them to get the information of the specific area. In this…
Reddit's VP of Engineering Bethanye Blount has quit after just two months on the job, telling Re/Code that she lost confidence in its new direction. "There are some very aggressive implied promises being made to the community -- in comments to mods, ...
That little computer you carry around in your pocket is already your camera, navigation device, instant messaging machine, ride-hailing tool and phone. But it's very possible that, in the not-so-distant future, what we now refer to as "smartphones" w...
Have you ever wondered what could happen if your MySQL database goes down? Although it’s evident such a crash will cause downtime – and surely some business impact in terms of revenue – can you do something to reduce this impact? The simple answer is “yes”…
This post was done in partnership with The Wirecutter, a list of the best technology to buy. Read the full article below at TheWirecutter.com. If you are looking for the best all-around value in a water-resistant Bluetooth speaker today, the best on...
With the arrival of El Capitan on Google Street View last month, you can now haul yourself virtually up one of the most famous rock faces in the world. Navigating certain streets in urban areas, however, can still be a challenge. As Google expands Street…
OR-Tools is an open source software suite for optimization, tuned for tackling the world's toughest problems in vehicle routing, flows, integer and linear programming, and constraint programming. After modeling your problem in the programming…
An implementation of Material Design components in vanilla CSS, JS, and HTML. Material Design Lite (MDL) lets you add a Material Design look and feel to your static content websites. It doesn't rely on any JavaScript frameworks or libraries. Optimized…
Whether it's a reaction to the Snowden revelations, a reaction to the continual news of massive data breaches, or just the obvious need to secure data in the cloud -- or all of the above -- new technologies for working directly on encrypted data are…
Note: this guide assumes you are using Babel, and requires that you use babel-preset-airbnb or the equivalent. It also assumes you are installing shims/polyfills in your app, with airbnb-browser-shims or the equivalent. This guide is available in other…
If you browse the log of any random Git repository, you will probably find its commit messages are more or less a mess. For example, take a look at these gems from my early days committing to Spring: Yikes. Compare that with these more recent commits from…
This post was done in partnership with The Wirecutter, a list of the best technology to buy. Read the full article below at TheWirecutter.com After measuring the charging speed of nearly 50 Lightning cables and sending the top 11 to our electrical e...
Update on December 8, 2015. An updated version of this post is available at Python Is Not C: Take Two. I have been using Python a lot lately, for various data science projects. Python is known for its ease of use. Someone with coding experience can use…
This is a collection of useful resources for building RESTful HTTP+JSON APIs. There are a lot of good tools and entire ecosystems out there! It can be overwhelming not knowing what options are available, so you can use this as a reference starting point. …
Whenever there is a configuration management discussion, there is always a debate that spins around "Puppet vs Chef vs Ansible vs SaltStack" topic (ok CFEngine people, don't be pissed, i will talk about it too). In general these discussions are…
Having grown up in Germany, Leif chose a career in software engineering. When joining the University of Victoria in Canada, Leif began to study how developers collaborate and work with others. Now working as the Head of Product at iDoneThis, Leif is…
This is a story of how my understanding about messaging with RabbitMQ evolved from ignorant to usable while hitting my head into the walls of the CAP theorem. I hope it will save some time for someone out there. Of course we will have guaranteed delivery!…
Quite often, especially for benchmarks, I am trying to limit available memory for a database server (usually for MySQL, but recently for MongoDB also). This is usually needed to test database performance in scenarios with different memory limits. I have…
The Little Go Book is a free introduction to Google's Go programming language. It's aimed at developers who might not be quite comfortable with the idea of pointers and static typing. It's longer than the other Little books, but hopefully still captures…
A Go "clone" of the great and famous Requests library GRequests is licensed under the Apache License, Version 2.0. See LICENSE for the full license text * Responses can be serialized into JSON and XML * Support for the following HTTP verbs GET, HEAD,…
This domain name has been registered with Gandi.netView the WHOIS data for rocketdb.io to see the domain’s public registration information.
Regular expressions are incantations that we developers wield mightily when the time calls. Yet, do we always wield them deftly? Regular expressions are a delicate and precise language. They are crafted with careful deliberation into powerful forces that…
A question I often hear when customers want to set up a production PXC cluster is: “How many nodes should we use?” Three nodes is the most common deployment, but when are more nodes needed? They also ask: “Do we always need to use an even number of nodes?”…
It is not enough for code to simply work. Good code is meant to be easy to understand, and it is much easier to understand code that is readable. Traditionally, algorithms have often been explained in large comment blocks. The notion that writing many…
A look at building analytics from the ground up at a mid-sized start-up and some of the challenges faced along the wayJoining 500px as Analytics Lead was a quick decision. I saw an amazing opportunity that most analysts would drool over — the chance to…
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GoReplay is an open-source network monitoring tool which can record your live traffic, and use it for shadowing, load testing, monitoring and detailed analysis. As your application grows, the effort required to test it also grows exponentially. GoReplay…
When a new version of MySQL is about to be released we read a lot of blog posts about the performance and scalability improvements. That’s good but sometimes we miss some small features that can help us a lot in our day-to-day tasks. One good example is…
Recently, I've been fighting with the never ending issue of timezones. I never thought I would have plunged into this rabbit hole, but hacking on OpenStack and Gnocchi I felt into that trap easily is, thanks to Python. To get a glimpse of the complexity…
What We Do How to receive a million packets per second Last week during a casual conversation I overheard a colleague saying: "The Linux network stack is slow! You can't expect it to do more than 50 thousand packets per second per core!" That got me…
We usually try to avoid subselects because sometimes they force the use of a temporary table and limits the use of indexes. But, when is good to use a subselect? This example was tested over table a (1310723 rows), b, c and d ( 5 rows each) and with MySQL…
A function that takes content (HTML/JS/PHP/etc) and CSS, and returns only the used CSS. PurifyCSS does not modify the original CSS files. You can write to a new file, like minification. If your application is using a CSS framework, this is especially…
Zurl is an HTTP and WebSocket client daemon with a ZeroMQ interface. Send it a message to make an HTTP request. For example, here's how to make a request using Python: import json import zmq # set up zmq socket sock =…
Back in January 2015 I stumbled upon a bug in iOS's mail client, resulting in HTML tag in e-mail messages not being ignored. This bug allows remote HTML content to be loaded, replacing the content of the original e-mail message. JavaScript is disabled in…
The engineers at Vinted began the year working on the improvement of the caching layer. We managed to significantly improve the performance of our Rails application and substantially reduce the number of database queries. But this additional load to our…
One of the most useful features of any version control system is the ability to “undo” your mistakes. In Git, “undo” can mean many slightly different things. When you make a new commit, Git stores a snapshot of your repository at that specific moment in…
Ever since MySQL replication has existed, people have dreamed of a good solution to automatically split read from write operations, sending the writes to the MySQL master and load balancing the reads over a set of MySQL slaves. While if at first it seems…
Distributed systems are not strictly an engineering problem. It’s far too easy to assume a “backend” development concern, but the reality is there are implications at every point in the stack. Often the trade-offs we make lower in the stack in order to buy…
Consultants are mystical people who ask a company for a number and then give it back to them.
Explore this month's featured podcast collection to get design inspiration and insights for the new year. Method explores the career journeys of designers at Google, while Design Notes goes in-depth with designers working in diverse creative disciplines.
Microsoft promette di fare pulizia nello store per Windows 10, un'operazione che costringera' gli sviluppatori a impegnarsi un po' di piu' per realizzare app che abbiano quantomeno una parvenza di utilita'
Go is decidedly polarizing. While many are touting their transition to Go, it has become equally fashionable to criticize and mock the language. As Bjarne Stroustrup so eloquently put it, “There are only two kinds of programming languages: those people…
