Redis Cluster Introduction

In the previous section of this course, we discussed many concepts regarding replication and partitioning. Although the concepts seemed simple, it is difficult to handle sharding if the nodes are constantly being added or removed. The Redis cluster is a way to do all of this automatically.

After over four years of development, Redis Cluster was released with the 3.0.0 release of Redis on April 1, 2015. “According to the founder, it is:

“…basically a data sharding strategy, with the ability to reshard keys from one node to another while the cluster is running, together with a failover procedure that makes sure the system is able to survive certain kinds of failures.””

The two major advantages of Redis cluster are:

• The ability to automatically split the dataset among multiple nodes.
• The ability to continue operations when a subset of the nodes are experiencing failures or are unable to communicate with the rest of the cluster.