We introduce a simple data model and API tailored for
serving the social graph, and TAO, an implementation
of this model. TAO is a geographically distributed data
store that provides efficient and timely access to the social
graph for Facebook’s demanding workload using a
fixed set of queries. It is deployed at Facebook, replacing
me mcache for many data types that fit its model. The
system runs on thousands of machines, is widely distributed,
and provides access to many petabytes of data.
TAO can process a billion reads and millions of writes
each second.