FAILOVER
Planned zero-loss handover: quiesce writes, wait for the target replica to drain, promote it, and follow it.
FAILOVER host port [TIMEOUT ms] | ABORTComplexity
O(1) at the command — the handover runs in the background, polling the target until it is caught up
Complexity and compatibility are read out of kevy's implementation, not copied from Redis's reference. Several genuinely differ.
Redis compatibility
Differs
Redis's syntax is FAILOVER [TO host port [FORCE]] [ABORT] [TIMEOUT ms] with an optional target; kevy's is FAILOVER host port [TIMEOUT ms] | ABORT — the target is mandatory and positional, and the port given is the target's client port