Automated testing is really important for ensuring your code is bug-free and works as expected but UI tests are particularly challenging as they tend to be flaky and unreliable. For an app like Yelp, a lot of tests are needed so developers will often see tests flake. You can look at test history to try and figure out if a test failure is your fault or not - and building tools to do so has been something we’ve invested time into - but you might be wrong and it takes time and effort to figure this out. This leads to...

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Brotli is a compression algorithm from Google that has been making waves recently. You may have heard about its average 10-20% filesize savings over gzip, at comparable decompression speeds. This makes it a very irresistable format for serving static content, but it still has immature support from CDNs, which puts it out of reach for general widespread availability. A search run over HTTP Archive data indicates that there are around 25 web properties serving Brotli Content-Encoding URLs from Fastly, the CDN we use to host our static content, as of July 25th. While Fastly does not automatically convert content to...

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Fred Wang has already done a lot. He graduated from U Penn’s Wharton School with degrees in Finance and Operations Management and then headed to New York City to co-found a startup. No big deal. Finding himself at a crossroads a few years later, he decided to try his luck on the west coast and joined Yelp’s new (at the time) Associate Product Manager (APM) program. Since his two-year anniversary at Yelp Eat24 is right around the corner, we decided to ask him a few questions about his experiences. Here’s what he had to say. Q: As a recent grad,...

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At Yelp, pagelets are a server-side optimization to parallelize the rendering of web pages across multiple web workers (loosely inspired by Facebook’s Big Pipe). We’ve implemented this and have been running it successfully in production for a while now. This blog post is about our journey implementing and rolling out pagelets, including what we’ve learned since the initial rollout. Pagelets at Yelp: an overview Main and pagelet workers Usually a request made to Yelp is fulfilled by a single web worker. This worker is in charge of generating a response (in the form of an HTTP packet, with headers and...

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While newer search engines at Yelp typically use Elasticsearch as a backend, Yelp’s core business search used its own custom backend, built directly on top of Lucene. This system was one of the oldest systems at Yelp to still be deployed in production. Some features of this custom search engine were Distributed Lucene instances Master-slave architecture Custom text analysis support for various languages Custom business ranking which relied mostly on using business features (think business attributes like reviews, name, hours_open, service_areas, etc.) Derived Yelp analytics data to improve quality of search results; e.g. most popular queries for a business ##Problems...

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As we continue to invest in the Yelp Fusion API, we are announcing that Yelp API v2 will be discontinued on June 30, 2018. If you are currently using v2 API endpoints, you have until June 30, 2018 to move them over to the Yelp Fusion API. We hope this gives everyone sufficient time to transition your applications from Yelp API v2 to Yelp Fusion, giving you the ability to tap into awesome new features like GraphQL, which we launched last month. Here is a summary of the Yelp API v2 sunset timeline: April 1, 2017 - Disabled Yelp API...

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Yelp Dataset Challenge Round 8 Winners The eighth round of the Yelp Dataset Challenge ran throughout the first half of 2017 and, as usual, we received a large number of very impressive and interesting submissions. Today, we are proud to announce the grand prize winner of the $5,000 award: “Clustered Model Adaption for Personalized Sentiment Analysis” by Lin Gong, Benjamin Haines, and Hongnin Wang (from the Department of Computer Science of the University of Virginia). The authors built a personalized sentiment classification model at the group level. Their model is based on social theories about group psychology and how human...

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This past April (2017) we finally migrated our monolith to PaaSTA (our open source PaaS based on Apache Mesos). Yes, although Yelp does subscribe to the Service-Oriented-Architecture theory and we constantly try to reduce the scope of the monolith, realistically it still looms over us as a large towering codebase that pays the bills. But that doesn’t mean we can’t try to constantly improve it. This blog post is about our latest improvement to the monolith: treating it just like any other service at Yelp and running it on PaaSTA. Background: What is Yelp’s Monolith Made Of? Yelp’s monolith is...

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