junkaixue commented on code in PR #2035:
URL: https://github.com/apache/helix/pull/2035#discussion_r849983346


##########
helix-rest/src/main/java/org/apache/helix/rest/clusterMaintenanceService/MaintenanceManagementInstanceInfo.java:
##########
@@ -84,11 +85,12 @@ public void mergeResult(MaintenanceManagementInstanceInfo 
info) {
   }
 
   public void mergeResult(MaintenanceManagementInstanceInfo info, boolean 
nonBlockingFailure) {
-    messages.addAll(info.getMessages());
-    status =
-        (info.isSuccessful() || nonBlockingFailure) && isSuccessful() ? 
OperationalStatus.SUCCESS
-            : OperationalStatus.FAILURE;
-    if (info.hasOperationResult()) {
+    if (info != null) {

Review Comment:
   All following logic relies on info != null. So why not just do:
   if (info == null) {
   return;
   }
   ?
   
   But before that, you need to move the status line before this. So status can 
be updated independently.
   



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