jackjlli commented on a change in pull request #4047: Create 
leadControllerResource in helix cluster
URL: https://github.com/apache/incubator-pinot/pull/4047#discussion_r289983563
 
 

 ##########
 File path: 
pinot-common/src/main/java/org/apache/pinot/common/config/TagNameUtils.java
 ##########
 @@ -45,7 +46,18 @@ public static boolean hasValidServerTagSuffix(String 
tagName) {
     return false;
   }
 
-  public static TenantRole getTenantRoleFromTag(String tagName) throws 
InvalidConfigException {
+  public static boolean isServerTag(String tagName)
+      throws InvalidConfigException {
+    return TenantRole.SERVER == getTenantRoleFromTag(tagName);
+  }
+
+  public static boolean isBrokerTags(String tagName)
+      throws InvalidConfigException {
+    return TenantRole.BROKER == getTenantRoleFromTag(tagName);
+  }
+
+  // Make this method private to avoid exposing null out of this class.
+  private static TenantRole getTenantRoleFromTag(String tagName) throws 
InvalidConfigException {
 
 Review comment:
   I think one of the reasons of keeping that is `tagName` can be 
misconfigured. This method `isServerTag` is to check whether it's a wrong tag 
name. Otherwise it will just return `false` and provides no extra information, 
which makes it harder to figure out.

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