Quick thoughts on “The eBay Architeture – Striking a balance….”

Just finished reading through this PDF presentation by Randy Shoup and Dan Pritchett. A really interesting view in the operations of one of the largest e-commerce deployment in the world – maybe the biggest. Here are some things that left an impression:

  • The numbers regarding daily transactions, users, LOCs etc. are stunning.
  • Their commitment on horizontal scaling. Still in 2007 designs for horizontal scalability are scarce.
  • “Limp mode” for business features if a failure occurs.
  • Original version of eBay build over a weekend.
  • In 2002 they chose to “re-write the entire application in j2ee”
  • … but threw out most of it (j2ee) in order to scale better (g. re-write connection pooling)
  • Abandoned transactions (client-side/distributed) in order to achieve better scalability – “created alternate DB structures”
  • Horizontal splitting of their DBs
  • No stored procedures – only simple triggers
  • CPU intensive (eg. data integrity) work taken away from the DB to the app
  • Application tier completely stateless (obviously)
  • Developed their own ORM technology – DAL: Data Access Layer
  • Real-time indexing (using messaging?)
  • Entire site automatically rolled-out every 2 weeks
  • Scalability is king!
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