private void startClusterManager() throws IOException {
    ClusterMapConfig clusterMapConfig =
        getClusterMapConfig(clusterName, adminForDc.keySet().iterator().next(), zkLayoutPath);
    HelixClusterAgentsFactory helixClusterAgentsFactory = new HelixClusterAgentsFactory(clusterMapConfig, null, null);
    validatingHelixClusterManager = helixClusterAgentsFactory.getClusterMap();
  }
Start the Helix Cluster Manager to be used for validation.
@throws IOException if there was an error instantiating the cluster manager.
ambry-clustermap/src/main/java/com/github/ambry/clustermap/HelixBootstrapUpgradeUtil.java