snleee commented on a change in pull request #7368:
URL: https://github.com/apache/pinot/pull/7368#discussion_r718011357



##########
File path: 
pinot-plugins/pinot-minion-tasks/pinot-minion-builtin-tasks/src/main/java/org/apache/pinot/plugin/minion/tasks/mergerollup/MergeRollupTaskGenerator.java
##########
@@ -277,6 +279,10 @@ public String getTaskType() {
         }
 
         Long prevWatermarkMs = 
mergeRollupTaskMetadata.getWatermarkMap().put(mergeLevel, windowStartMs);
+        if (prevWatermarkMs != null) {

Review comment:
       @jtao15 @Jackie-Jiang Updated. Can you guys take a look again? I removed 
this check. `watermarkMs` cannot be null so we can just call `setWatermarkMs` 
without the check.




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