Multimaster Support

KeyDB now has support with multiple masters when replicating. This mode is enabled with the following configuration line:

multi-master yes

When KeyDB connects with multiple masters it behaves differently than with traditional replication:

• Multiple invocations of the replicaof command will result in adding additional masters, not replacing the current one
• KeyDB will not drop its database when sync'ing with the master
• KeyDB will merge any reads/writes from the master with its own internal database
• KeyDB will default to last operation wins

This means that a replica with multiple masters will contain a superset of the data of all its masters. If two masters have a value with the same key it is undefined which key will be taken. If a master deletes a key that exists on another master the replica will no longer contain a copy of that key.

This feature is still experimental, if you try it out please let us know how it works for you.