ZAB Algorithm

ZAB is an atomic broadcast algorithm, which orders and executes concurrent requests in a sequential manner.

It consists of two modes:

  • Recovery: When the service starts or after a leader failure. Ends when a leader emerges and a quorum of servers have synchronized their state with the leader
  • Broadcast: The leader is the server that executes a broadcast by initiating the broadcast protocol. Once a leader has synchronized with a quorum of followers, it begins to broadcast messages

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