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Is it possible to build the entire social networking application on cassandra?
Sure, it takes longer to set up, but it scales much better. Correct?
Please list the situations when Cassandra should be used.
Cassandra is in use at Digg, Facebook, Twitter, Reddit, Rackspace, Cloudkick, Cisco etc. so the answer to your first question would be yes.
The short version of the list that describes the situations in when Cassandra should be used.
You need the possibility to add new
nodes to yout cluster, with no downtime.
You need a richer data model (column
oriented) than simple key/value
You need the possibility to have both
synchronous and asynchronous
replication for each update.