deepthi912 commented on code in PR #17324:
URL: https://github.com/apache/pinot/pull/17324#discussion_r2678439886


##########
pinot-segment-local/src/main/java/org/apache/pinot/segment/local/upsert/ConcurrentMapPartitionUpsertMetadataManager.java:
##########
@@ -139,14 +148,19 @@ protected void doAddOrReplaceSegment(ImmutableSegmentImpl 
segment, ThreadSafeMut
                   currentSegmentName, getAuthoritativeCreationTime(segment),
                   getAuthoritativeCreationTime(currentSegment)))) {
                 replaceDocId(segment, validDocIds, queryableDocIds, 
currentSegment, currentDocId, newDocId, recordInfo);
+                if (currentSegment != segment) {
+                  _previousKeyToRecordLocationMap.put(primaryKey, 
currentRecordLocation);

Review Comment:
   Exists in which map? if the key doesn't exist in the 
_primaryKeyToRecordLocationMap, then the code wouldn't reach here. So my 
assumption was the key already exists. Since we use _newlyAddedKeys for new 
keys we track new keys little differently



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