Ozone Manager nodes in High Availability

A High Availability (HA) configuration of the Ozone Manager (OM) involves one leader OM node and two or more follower nodes. The leader node services read and write requests from the client. The follower nodes closely keep track of the updates made by the leader so that in the event of a failure, one of the follower nodes can take over the operations of the leader.

The leader commits a transaction only after at least one of the followers acknowledges to have received the transaction.