krishan1390 commented on code in PR #15563:
URL: https://github.com/apache/pinot/pull/15563#discussion_r2052306825


##########
pinot-controller/src/main/java/org/apache/pinot/controller/helix/core/realtime/PinotLLCRealtimeSegmentManager.java:
##########
@@ -1651,13 +1655,17 @@ private void createNewConsumingSegment(TableConfig 
tableConfig, StreamConfig str
   }
 
   private Map<Integer, StreamPartitionMsgOffset> 
fetchPartitionGroupIdToSmallestOffset(
-      List<StreamConfig> streamConfigs) {
+      List<StreamConfig> streamConfigs, IdealState idealState) {
     Map<Integer, StreamPartitionMsgOffset> partitionGroupIdToSmallestOffset = 
new HashMap<>();
     for (StreamConfig streamConfig : streamConfigs) {
+
+      List<PartitionGroupConsumptionStatus> 
currentPartitionGroupConsumptionStatusList =
+          getPartitionGroupConsumptionStatusList(idealState, streamConfigs);
+
       OffsetCriteria originalOffsetCriteria = streamConfig.getOffsetCriteria();
       streamConfig.setOffsetCriteria(OffsetCriteria.SMALLEST_OFFSET_CRITERIA);
       List<PartitionGroupMetadata> partitionGroupMetadataList =
-          getNewPartitionGroupMetadataList(streamConfigs, 
Collections.emptyList());
+          getNewPartitionGroupMetadataList(streamConfigs, 
currentPartitionGroupConsumptionStatusList);

Review Comment:
   if we send empty list to getNewPartitionGroupMetadataList, the function 
assumes that no shards are currently being consumed. 
   
   for kinesis, we need to completely consume a parent shard before starting 
consumption for a child shard. 
   
   so if parent shard doesn't exist, the function doesn't return child shards 
because it asks us to consume parent shard first. 



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