Presentation on theme: "2013 Building and Improving Products with Hadoop Matthew Rathbone."— Presentation transcript:
2013 Building and Improving Products with Hadoop Matthew Rathbone
2013 What is Foursquare Foursquare helps you explore the world around you. Meet up with friends, discover new places, and save money using your phone. 4bn check-ins 35mm users 50mm POI 150 employees 1tb+ a day of data
2013 FIRST, A STORY http://www.flickr.com/photos/shannonpatrick17
2013 The Right Tool for the Job Nginx – Serving static files Perl – Regular expressions XML – Frustrating people Hadoop (Map Reduce) – Counting
2013 COUNTING – WHAT IS IT GOOD FOR http://www.flickr.com/photos/blaahhi/
2013 SIPS use cases menu extraction sentiment analysis venue ratings specific recommendations search indexing pricing data facility information
2013 How is SIPS built? Basically lots of counting.
2013 SIPS Tokenize data with a language model (into N- Grams) built using tips, shouts, menu items, likes, etc Apply a TF-IDF algorithm (Term frequency, inverse document frequency) Global phrase count Local phrase count ( in a venue ) Some Filtering and ranking Re-compute & deploy nightly
2013 WHY USE HADOOP? http://www.flickr.com/photos/dbrekke/
2013 SIPS – Without Hadoop Potential Problems Database Query Throttling Venues are out of sync Altering the algorithm could take forever to populate for all venues Where would you store the results? What about debug data? Does it scale to 10x, 100x? What about other, similar workflows?
2013 SIPS – Hadoop Benefits Quick Deployment Modular & Reusable Arbitrarily complex combination of many datasets Every step of the workflow creates value
2013 Apple Store - Downtown San Francisco 1 tip mentions "haircuts" Search for "haircuts" in "san francisco" Apple store??? Fixed by looking at % of tips and overall frequency “Hey Apple, how bout less shiny pizzazz and fancy haircuts and more fix- my-f!@#$-imac”
2013 The best way to start Don’t use Hadoop. *but pretend you do
2013 Other reasons to not use Hadoop Your idea might not be very good Hadoop will slow you down to start with You don’t have enough infrastructure yet build it when you need it V1 might not be that complex V1 could be a spreadsheet
SIPS Version 1 Off the shelf language model A subset of Venues & Tips Did not use Map Reduce Did not push to production at all
2013 SIPS Version 2 Started building our own language model Rewritten as a Map Reduce Manually loaded data to production Filters for English data only. Tweak, improve, etc
2013 SIPS Version 3 Incorporated more data sources into our language model Deployment to KV store (auto) Incorporated lots of debug output Language pipeline also feeds sentiment analysis Now we’re in the perfect place to iterate & improve
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