narendly commented on a change in pull request #858: Add logs and throw 
exceptions in getInstanceById
URL: https://github.com/apache/helix/pull/858#discussion_r388015261
 
 

 ##########
 File path: 
helix-core/src/main/java/org/apache/helix/util/InstanceValidationUtil.java
 ##########
 @@ -266,6 +269,9 @@ public static boolean isInstanceStable(HelixDataAccessor 
dataAccessor, String in
       IdealState idealState = 
dataAccessor.getProperty(keyBuilder.idealStates(idealStateName));
       if (idealState == null || !idealState.isEnabled() || 
!idealState.isValid()
           || 
TaskConstants.STATE_MODEL_NAME.equals(idealState.getStateModelDefRef())) {
+        _logger.warn(
+            "idealState is either null, not enabled, not valid, or has Task as 
stateModelDefRef. IdealState: {}",
+            instanceName);
 
 Review comment:
   This won't make things fail, will it? Since we are doing a continue, I don't 
think this would be necessary.

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