xyuanlu commented on code in PR #2099:
URL: https://github.com/apache/helix/pull/2099#discussion_r884072595


##########
helix-core/src/main/java/org/apache/helix/HelixPropertyFactory.java:
##########
@@ -80,20 +80,27 @@ public HelixManagerProperty getHelixManagerProperty(String 
zkAddress, String clu
    * @param clusterName
    * @return
    */
+
   public static CloudConfig getCloudConfig(String zkAddress, String 
clusterName) {
+    return getCloudConfig(zkAddress, clusterName, null);
+  }
+  public static CloudConfig getCloudConfig(String zkAddress, String 
clusterName,
+      RealmAwareZkClient.RealmAwareZkConnectionConfig 
realmAwareZkConnectionConfig) {
     CloudConfig cloudConfig;
     RealmAwareZkClient dedicatedZkClient = null;
     try {
       if (Boolean.getBoolean(SystemPropertyKeys.MULTI_ZK_ENABLED) || zkAddress 
== null) {
         // If the multi ZK config is enabled or zkAddress is null, use 
realm-aware mode with
         // DedicatedZkClient
         try {
-          RealmAwareZkClient.RealmAwareZkConnectionConfig connectionConfig =
-              new RealmAwareZkClient.RealmAwareZkConnectionConfig.Builder()
-                  .setRealmMode(RealmAwareZkClient.RealmMode.SINGLE_REALM)
-                  .setZkRealmShardingKey("/" + clusterName).build();
+          if (realmAwareZkConnectionConfig == null) {

Review Comment:
   TFTR. When we add an API to allow user to pass in 
`RealmAwareZkConnectionConfig` and when user pass in a null obj, shouldn't we 
create a default one instead of using the null?



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