A Look inside LiveJournal

Rarely does a company offer people the opportunity to see its infrastructural organization. Danga does in this rare
talk from LISA 2004.

Some takeaway lessons from the talk are:

  • Separate services across hosts
  • Scale each component separately
  • Avoid large database replication by using internal pre-indexing of data across databases
  • Let your services fit your needs (ie use both an IP and an HTTP filter for different problems)
  • Storage is key, eg their use of both NetApp, mySQL replication and internally developed storage system MogileFS
  • Cache is key, use Memcached
  • Measure and monitor all aspects of the system for availability and planning
  • This talk is from 2004. We can only speculate to how things have changed since.


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