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Akka was selected over Infinispan primarily for two reasons:

  • Storing tree structures efficiently (Yang models)
  • Supporting data change notifications

The Raft protocol is used for leader elections among the replicas of each shard. The shard leader is responsible for coordinating the three-phase commit (3PC) protocol used by ODL clustering to ensure strong consistency in its data store, but the 3PC communications are distinct from the Raft protocol.