Redis data replication is a process of synchronizing data across multiple Redis servers. It is used to increase data availability and fault tolerance.
Redis data replication works by having a master server that is responsible for writing data and multiple slaves that continuously replicate the data from the master. When the master receives a write command, it sends the data to the slaves, which then store the data in their own memory. This ensures that if the master fails, the slaves can take over and provide the same data.
For example, let’s say you have a Redis cluster with a master and three slaves. The master receives a write command to store a key-value pair in the database. The master will then send this data to the slaves, which will then store the data in their own memory. This ensures that if the master fails, the slaves can take over and provide the same data.