deemoliu commented on code in PR #10915:
URL: https://github.com/apache/pinot/pull/10915#discussion_r1237809232


##########
pinot-segment-local/src/main/java/org/apache/pinot/segment/local/upsert/ConcurrentMapPartitionUpsertMetadataManager.java:
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@@ -55,12 +64,17 @@ public class ConcurrentMapPartitionUpsertMetadataManager 
extends BasePartitionUp
 
   // Reused for reading previous record during partial upsert
   private final GenericRow _reuse = new GenericRow();
+  private long _lastExpiredTimeMS;

Review Comment:
   this is the watermark value. that keep track of the last time we cleaned up 
primary keys.



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