@BeforeClass
  public static void initialize() throws IOException {
    tempDirPath = getTempDir("helixBootstrapUpgrade-");
    Properties storeProps = new Properties();
    storeProps.setProperty("helix.property.store.root.path", ROOT_PATH);
    propertyStoreConfig = new HelixPropertyStoreConfig(new VerifiableProperties(storeProps));
    int port = 2200;
    for (int i = 0; i < dcs.length; i++) {
      dcsToZkInfo.put(dcs[i], new ZkInfo(tempDirPath, dcs[i], ids[i], port++, true));
    }
  }
Shutdown all Zk servers before exit.
ambry-tools/src/integration-test/java/com/github/ambry/clustermap/HelixBootstrapUpgradeToolTest.java