NealSun96 commented on a change in pull request #788: WIP: Implement request 
forwarding for ZkRoutingDataWriter
URL: https://github.com/apache/helix/pull/788#discussion_r382294591
 
 

 ##########
 File path: 
helix-rest/src/main/java/org/apache/helix/rest/metadatastore/accessor/ZkRoutingDataWriter.java
 ##########
 @@ -77,7 +88,23 @@ public synchronized boolean addMetadataStoreRealm(String 
realm) {
       return createZkRealm(realm);
     }
 
-    // TODO: Forward the request to leader
+    String leaderHostName = _leaderElection.getCurrentLeaderInfo().getId();
+    String url =
+        leaderHostName + "/admin/v2/namespaces/" + _namespace + 
"/metadata-store-realms/" + realm;
+    HttpPut putRequest = new HttpPut(url);
+    try {
+      HttpResponse response = _forwardHttpClient.execute(putRequest);
+      if (response.getStatusLine().getStatusCode() != 201) {
+        HttpEntity respEntity = response.getEntity();
+        LOG.error("the forwarded request to leader has failed for 
addMetadataStoreRealm: {}",
+            respEntity != null ? EntityUtils.toString(respEntity) : "");
 
 Review comment:
   When there's no response body, it is still necessary to log "the forward 
request has failed". Constructing it like this reduces duplication. 
   Maybe I can change "" to "No response body is returned" or something else 
meaningful. 

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