deemoliu commented on code in PR #10047:
URL: https://github.com/apache/pinot/pull/10047#discussion_r1198137711


##########
pinot-core/src/main/java/org/apache/pinot/core/data/manager/realtime/RealtimeTableDataManager.java:
##########
@@ -526,6 +529,32 @@ private void handleUpsert(ImmutableSegment 
immutableSegment) {
             _tableNameWithType));
     PartitionUpsertMetadataManager partitionUpsertMetadataManager =
         _tableUpsertMetadataManager.getOrCreatePartitionManager(partitionId);
+    return partitionUpsertMetadataManager;
+  }
+
+  /**
+   * Handle Upsert TTL during segment state change from CONSUMING to ONLINE.
+   *
+   * When a new segments commit, we will remove primary key indexes from heap 
that has timestamp < (eventTime - TTL).
+   * For all segments sealed before (eventTime-TTL), their validDocIds won't 
get updated. We do an one-time persistance.

Review Comment:
   Only segments that haven't been persisted before will do snapshot 
persistence.
   
   We have a concurrent priorityQueue to keep track all the segments that 
snapshot not have been persisted.



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