public void start() {
    Utils.newThread(() -> {
      try {
        DcInfo dcInfo;
        if (dcZkInfo.getReplicaType() == ReplicaType.DISK_BACKED) {
          dcInfo = initializeHelixDatacenter();
        } else {
          throw new UnsupportedOperationException("Unknown replica type: " + dcZkInfo.getReplicaType());
        }
        initializationFuture.complete(dcInfo);
      } catch (Exception e) {
        logger.warn("Exception while initializing datacenter {}", dcName, e);
        onInitializationFailure(e);
      }
    }, false).start();
  }
Begin the startup procedure in a background thread.
ambry-clustermap/src/main/java/com/github/ambry/clustermap/HelixDatacenterInitializer.java