EPaxos is an efficient, leaderless replication protocol. The name stands for Egalitarian Paxos -- EPaxos is based on the Paxos consensus algorithm. As such, it can tolerate up to F concurrent replica failures with 2F+1 total replicas. To function effectively as a replication protocol, Paxos has to rely on a stable leader replica (this optimization is known as Multi-Paxos). The leader can become a bottleneck for performance: it has to handle more messages than the other replicas, and remote clients have to contact the leader, thus experiencing higher latency. Other Paxos variants either also rely on a stable leader, or have a pre-established scheme that allows different replicas to take turns in proposing commands (such as Mencius). This latter scheme suffers from tight coupling of the performance of the system from that of every replica -- i.e., the system runs at the speed of the slowest replica.