[GitHub] [pinot] snleee commented on a change in pull request #7761: Fix merge delay metric when there is empty bucket

[GitBox <gi...@apache.org>]

snleee commented on a change in pull request #7761:
URL: https://github.com/apache/pinot/pull/7761#discussion_r748770287



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File path: pinot-plugins/pinot-minion-tasks/pinot-minion-builtin-tasks/src/main/java/org/apache/pinot/plugin/minion/tasks/mergerollup/MergeRollupTaskGenerator.java
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@@ -254,7 +254,11 @@ public String getTaskType() {
         // but the metrics are not available until the controller schedules a valid task
         long maxEndTimeMs = Long.MIN_VALUE;
         for (SegmentZKMetadata preSelectedSegment : preSelectedSegments) {
-          maxEndTimeMs = Math.max(maxEndTimeMs, preSelectedSegment.getEndTimeMs());
+          long currentEndTimeMs = preSelectedSegment.getEndTimeMs();
+          // Compute maxEndTimeMs among segments that are valid for merge (e.g. endTimeStamp < currentTime - bufferTime)
+          if (isValidBucketEndTime(currentEndTimeMs, bufferMs, lowerMergeLevel, mergeRollupTaskMetadata)) {
+            maxEndTimeMs = Math.max(maxEndTimeMs, preSelectedSegment.getEndTimeMs());

Review comment:
       good catch. fixed




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