There is one theorem in computer science called the CAP theorem states that it is impossible for a distributed data store to simultaneously provide more than two out of the following three guarantees.

• Consistency: every read receives the most recent write or an error.
• Availability: every request receives a (non-error) response, without the guarantee that it contains the most recent write.
• Partition tolerance: the system continues to operate despite an arbitrary number of messages being dropped (or delayed) by the network between nodes.

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