Redis Sentinel provides high availability and monitoring for Redis, but it does not guarantee strong consistency.
Linearizability requires that once a write is acknowledged, all subsequent reads should reflect that write.
if min-replicas-to-write is set to the number of Redis replica then if a single node goes down you won't be able to do any write (take lock or release lock).
if min-replicas-to-write is set to any number smaller than the total number or Redis replica some replica could still be lagging because of Asynchronous replication.
Also when a replica acknowledges a write in Redis, it means that the write has been received and logged by the replica, but it doesn’t necessarily mean that the write has been fully processed and applied to the data set.
This mean reading from replica that acknowledges a write from master might still return the Old value for the Key.
Linearizability requires that once a write is acknowledged, all subsequent reads should reflect that write.
if min-replicas-to-write is set to the number of Redis replica then if a single node goes down you won't be able to do any write (take lock or release lock).
if min-replicas-to-write is set to any number smaller than the total number or Redis replica some replica could still be lagging because of Asynchronous replication.
Also when a replica acknowledges a write in Redis, it means that the write has been received and logged by the replica, but it doesn’t necessarily mean that the write has been fully processed and applied to the data set.
This mean reading from replica that acknowledges a write from master might still return the Old value for the Key.