Yelp was founded in 2004 to help people find great local businesses like dentists, hair stylists and mechanics. Yelp had an average of approximately 102 million monthly unique visitors in Q1 2013. Yelpers have written over 39 million local reviews. In addition to reviews, you can use Yelp to find events, lists and to talk with other Yelpers.



  • In October 2008 we moved to using scribe (now a custom branch), which has served us very well over the past 5+ years that we’ve been using it. We take the logs scribe aggregates and move them into Amazon S3 for storage, which makes using EMR on AWS seamless.


  • We’ve also been able to leverage Amazon EC2 using AWS Direct Connect, which allows our engineering teams to bring up hardware whenever they need. It’s been awesome removing the hardware barrier for getting to production.


  • in 2009 we open sourced mrjob, which allows any engineer to write a MapReduce job without contending for resources. We’re only limited by the amount of machines in an Amazon data center (which is an issue we’ve rarely encountered).


  • Real-time analytics are much better than periodically run batch jobs, so recently we open sourced Pyleus which allows anyone to write Storm topologies using Python.



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