Jackie-Jiang commented on a change in pull request #7427:
URL: https://github.com/apache/pinot/pull/7427#discussion_r715001235



##########
File path: 
pinot-controller/src/main/java/org/apache/pinot/controller/api/upload/ZKOperator.java
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@@ -58,18 +58,25 @@ public ZKOperator(PinotHelixResourceManager 
pinotHelixResourceManager, Controlle
     _controllerMetrics = controllerMetrics;
   }
 
-  public void completeSegmentOperations(String tableNameWithType, 
SegmentMetadata segmentMetadata,
+  public boolean completeSegmentOperations(String tableNameWithType, 
SegmentMetadata segmentMetadata,

Review comment:
       We are using exception to pass the failure information for 
`processNewSegment()` and `processExistingSegment()`, so suggest directly 
throwing exception if refreshing segment does not exist. Directly throwing 
exception has the benefit of having more context info, and the accurate stack 
trace




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