On CAP theorem

From: http://www.cloudera.com/blog/2010/04/cap-confusion-problems-with-partition-tolerance/

....partition tolerance is not something we have a choice about designing into our systems. If you have a partition in your network, you lose either consistency (because you allow updates to both sides of the partition) or you lose availability (because you detect the error and shutdown the system until the error condition is resolved). Partition tolerance means simply developing a coping strategy by choosing which of the other system properties to drop. This is the real lesson of the CAP theorem – if you have a network that may drop messages, then you cannot have both availability and consistency, you must choose one. We should really be writing Possibility of Network Partitions => not(availability and consistency), but that’s not nearly so snappy.