public void startIteration(ReplicaThread.RemoteReplicaGroup remoteReplicaGroup,
      List<ReplicaTracker> inflightReplicas) {
    this.remoteReplicaGroup = remoteReplicaGroup;
    this.inflightReplicaTrackers = inflightReplicas;
    this.iterations++;
  }
This method should be called, when a new remote replica group
@param remoteReplicaGroup Remote replica group created for this tracker
@param inflightReplicas replica trackers for replicas included in the remoteReplicaGroup
ambry-replication/src/main/java/com/github/ambry/replication/continuous/GroupTracker.java