Hugh E. Williams work in the Marketplaces business at eBay. He recently post an article with some insight technologies and numbers.
Few facts about our scale and size. I thought I’d share some with you:
- We have over 10 petabytes of data stored in our Hadoop and Teradata clusters. Hadoop is primarily used by engineers who use data to build products, and Teradata is primarily used by our finance team to understand our business
- We have over 300 million items for sale, and over a billion accessible at any time (including, for example, items that are no longer for sale but that are used by customers for price research)
- We process around 250 million user queries per day (which become many billions of queries behind the scenes – query rewriting implies many calls to search to provide results for a single user query, and many other parts of our system use search for various reasons)
- We serve over 2 billion pages to customers every day
- We have over 100 million active users
- We sold over US$68 billion in merchandize in 2011
- We make over 75 billion database calls each day (our database tables are denormalized because doing relational joins at our scale is often too slow – and so we precompute and store the results, leading to many more queries that take much less time each)
Full article available here
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