It's true there is some overlap, but also Sentinel uses things that are specific of Redis. For instance for us two things are crucial: 1) The ability to use th

It's true there is some overlap, but also Sentinel uses things that are specific of Redis. For instance for us two things are crucial: 1) The ability to use the master as a message bus to auto-discover things. This is possible because every Redis instance is also a Pub/Sub server. 2) The idea that after every restart of every Redis instance we have a "runid" that changes. And in general the logic of the failover itself, the fact that the failure detection is precise (some specific reply codes are considered in a way, some others in another way), makes a non specific solution much harder to implement with the "methods" to perform the service-specific tasks that may end to be complex, or sometimes forces to completely change the logic of the system (lack of Pub/Sub).