@Override
  protected void createThread(ReplicaThread replicaThread, boolean unused) {
    replicaThread.setThread(Utils.newThread(replicaThread.getName(), replicaThread, false));
  }
Returns the number of replication threads to create
@return num replication threads
ambry-cloud/src/main/java/com/github/ambry/cloud/VcrReplicationManager.java