Mastering Redis

Overview of running Redis Cluster

Nodes in a Redis Cluster are Redis instances that are either masters or slaves. A master Redis instance is allocated one or more of the 16,384 available hash slots where Redis keys are assigned to a hash slot based on the CRC16 hashing of the key and taking the remainder of dividing the CRC16 by the number of masters. When a Redis cluster is running, each node has two TCP sockets open; the first is the standard Redis protocol for connecting clients, the default being port 6379 and the second port is calculated from the sum of the first port plus 10000 (16379 for the default port) that runs the Cluster's binary protocol for node-to-node communication. Clients should never need to connect directly with the cluster ...