One of the nice features of Cassandra that makes it a popular NoSQL database in the industry is its native support for multidata center clusters. There are no manual steps required to clone data from one data center to another. Once the cluster is properly configured with two data centers, all the requests (read or write) are forwarded to both data centers. For this setup to work, a few configuration changes, as well as schema changes, are required.
Here is an illustration of a multidata center cluster:
Here, we have two datacenters named DC1 and DC2, each with four nodes. For simplicity purposes, I am assuming a token range of 0-100. We will notice that the entire token range is split into four ranges on both the data centers rather than eight ranges. This means the same data is written to both the data centers. Even though they are part of the same cluster, both of them are considered separate entities when it comes to topology. Also, there has to be connectivity...