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Category: Civil Engineering

TrafficShift: Load Testing at Scale

Co-authors: Anil Mallapur and Michael Kehoe   LinkedIn started as a professional networking service in 2003, serving user requests out of single data center. For any internet services company, availability is a key factor in its success. In any internet architecture, a lot of things can go wrong at any given time; network links can die, power fluctuations can knock out entire racks of servers, or you could release bad code. In the face of adversity, keeping LinkedIn up and…

Standing Up to a Dangerous New Breed of Patent Troll

On March 20th, Cloudflare received our first patent infringement claim: Blackbird Tech LLC v. Cloudflare, Inc. Today we’re filing our Answer to that claim in a federal court in Delaware. We have very strong arguments we will present in the litigation, mostly because the patent asserted against us does not have anything to do with our technology. The infringement claim is not a close one. The asserted patent, US 6453335 (‘335 patent) was filed in 1998, and describes a system…

How Cloudflare analyzes 1M DNS queries per second

On Friday, we announced DNS analytics for all Cloudflare customers. Because of our scale –– by the time you’ve finished reading this, Cloudflare DNS will have handled millions of DNS queries –– we had to be creative in our implementation. In this post, we’ll describe the systems that make up DNS Analytics which help us comb through trillions of these logs each month. How logs come in from the edge Cloudflare already has a data pipeline for HTTP logs. We…

Scaling Airbnb’s Experimentation Platform – Airbnb Engineering & Data Science – Medium

At Airbnb, we are constantly iterating on the user experience and product features. This can include changes to the look and feel of the website or native apps, optimizations for our smart pricing and search ranking algorithms, or even targeting the right content and timing for our email campaigns. For the majority of this work, we leverage our internal A/B Testing platform, the Experimentation Reporting Framework (ERF), to validate our hypotheses and quantify the impact of our work. Read about…

A novel approach to neural machine translation | Engineering Blog | Facebook Code

Language translation is important to Facebook’s mission of making the world more open and connected, enabling everyone to consume posts or videos in their preferred language — all at the highest possible accuracy and speed. Today, the Facebook Artificial Intelligence Research (FAIR) team published research results using a novel convolutional neural network (CNN) approach for language translation that achieves state-of-the-art accuracy at nine times the speed of recurrent neural systems.1 Additionally, the FAIR sequence modeling toolkit (fairseq) source code and…

OnlineSchemaChange rebuilt in Python | Engineering Blog | Facebook Code

In 2010, Facebook open-sourced OnlineSchemaChange.php, a tool to perform MySQL schema changes while minimizing downtime. We are happy to announce that an improved version written in Python is now available on GitHub. Making schema change easier OnlineSchemaChange.php was initially implemented to make DDL on MySQL less cumbersome. It covers more use cases that native Online DDL supports and provides more features. As we continued to use the PHP version, we found design constraints that made it hard to add and…

Neel Khosa bestowed PTI Fellow Award

Neel Khosa, Vice President of AMSYSCO, was presented the 2017 PTI Fellow Award for his outstanding long-term contributions to the Post-Tensioning Institute and the industry.  The award was presented by David Martin, PTI President, and Theodore Neff, PTI Executive Director, on May 1st at the 2017 PTI Awards Ceremony in Atlanta, GA. Neel Khosa, along with his father Rattan Khosa, joins a list of 55 PTI Fellows who meet the following criteria: At the time of nomination, a Fellow shall have been…

Building an Intelligent Experimentation Platform with Uber Engineering

During our inaugural Uber Technology Day, data scientist Eva Feng delivered a presentation on Uber’s experimentation platform (XP). In this article, she and colleague Zhenyu Zhao detail how Uber engineered an XP capable of rolling out new features stably and quickly at scale. The lifecycle of feature development for a mobile app is composed of identifying opportunities, prototyping, experimentation, launching, refining, and identifying opportunities again. Experimentation is a critical stage of the product lifecycle; it is the process of discovering and…

How eero mesh WiFi routers connect to the cloud

This is a guest post by Gabe Kassel, Product Manager for Embedded Software at eero. Relying on a single wireless router to provide internet in every room of the home is like expecting a single light bulb to illuminate the entire house. It’s physics – WiFi radio waves don’t travel through walls or objects easily. The eero Home WiFi System is a new take on home connectivity, bucking the trend of one high-powered device in the center of the home.…

100 High-Rise Towers | AMSYSCO Post Tensioning

AMSYSCO Inc. recently reached an important milestone.  We have 100 high-rise towers (20-stories or more) listed in the ‘Skyscraper Database‘ by the Council on Tall Buildings and Urban Habitat.  All of the towers have post-tensioned concrete in the elevated slabs. To date, 78 high-rises towers are either completed or topped-out.  Another 22 high-rise towers are under construction.  Most of the high-rise towers are located in the Midwest US. Our largest market is in downtown Chicago – the birthplace of the…