pkuwm commented on a change in pull request #1033:
URL: https://github.com/apache/helix/pull/1033#discussion_r433529334



##########
File path: 
helix-core/src/main/java/org/apache/helix/controller/GenericHelixController.java
##########
@@ -1258,12 +1258,12 @@ protected void 
checkLiveInstancesObservation(List<LiveInstance> liveInstances,
           if (lastInstances == null || !lastInstances.containsKey(instance)) {
             try {
               manager.addCustomizedStateRootChangeListener(this, instance);
-              logger.info(manager.getInstanceName() + " added customized root 
change listener for"
-                  + " " + instance
-                  + ", listener: " + this);
+              logger.info(manager.getInstanceName() + " added root path 
listener for customized "

Review comment:
       I understand you may want to keep logging as original. But since you are 
changing the logging code here, I suggest changing it to use parameterized 
logging: `logger.info("Hello {}", world);`. This parameterized logging has 
benefits of reduce string concatenation overhead when logging level info is not 
enabled, and easier to read in the code. Same as the other places in this PR.
   Nit, I realized this for loop needs unindent.

##########
File path: 
helix-core/src/main/java/org/apache/helix/manager/zk/CallbackHandler.java
##########
@@ -639,8 +638,13 @@ private void subscribeForChanges(NotificationContext.Type 
callbackType, String p
             }
           }
         } catch (ZkNoNodeException | HelixMetaDataAccessException e) {
-          logger.warn(
-              "fail to subscribe child/data change. path: " + path + ", 
listener: " + _listener, e);
+          if (_changeType == CUSTOMIZED_STATE_ROOT) {
+            logger.warn(
+                "fail to subscribe child/data change. path: " + path + ", 
listener: " + _listener);

Review comment:
       `fail to` -> `Failed to` ? Same for the others.




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