Availability is quite low for write operations, because the failure of a single node makes the system unable to process writes until the node recovers.

Possible solution

To solve this problem, we can use the reverse strategy. That is, we write data only to the node that is responsible for processing a write operation, but process read operations by reading from all the nodes and returning the latest value.

This increases the availability of writes significantly but decreases the availability of reads at the same time. So, we have a trade-off that needs a mechanism to achieve a balance. Let’s see that mechanism.