narendly commented on a change in pull request #788: Implement request 
forwarding for ZkRoutingDataWriter
URL: https://github.com/apache/helix/pull/788#discussion_r384313041
 
 

 ##########
 File path: 
helix-rest/src/main/java/org/apache/helix/rest/metadatastore/accessor/ZkRoutingDataWriter.java
 ##########
 @@ -77,8 +103,9 @@ public synchronized boolean addMetadataStoreRealm(String 
realm) {
       return createZkRealm(realm);
     }
 
-    // TODO: Forward the request to leader
-    return true;
+    String url_suffix = "namespaces/" + _namespace + "/metadata-store-realms/" 
+ realm;
+    return forwardRequestToLeader(url_suffix, "put", "addMetadataStoreRealm",
 
 Review comment:
   Same here, let's make these String constants.
   
   I believe "addMetadataStoreRealm" should come from 
MetadataStoreDirectoryConstants.
   "put" could be a private enum called 
   ```
   enum RequestForwardingHttpVerbs {
       PUT,
       POST,
       DELETE
   }
   ``` something like this.

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