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DataStructures / System Design

Difference between eventual and strong consistency in Distributed Databases.

Eventual consistency makes sure that data of each node of the database gets consistent eventually. Time taken by the nodes of the database to get consistent may or may not be defined.

In Strong consistency, data will get passed to all the replicas as soon as a write request comes to one of the replicas of the database. But while these replicas are being updated with new data, response to any subsequent read/write requests gets delayed as all replicas are busy in keeping each other consistent.

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