npawar commented on code in PR #8663:
URL: https://github.com/apache/pinot/pull/8663#discussion_r875040716


##########
pinot-controller/src/main/java/org/apache/pinot/controller/helix/core/realtime/PinotLLCRealtimeSegmentManager.java:
##########
@@ -1385,4 +1386,89 @@ public void uploadToDeepStoreIfMissing(TableConfig 
tableConfig, List<SegmentZKMe
       }
     }
   }
+
+  /**
+   * Creates PROPERTYSTORE and IDEALSTATE entries for each partitionGroup to 
resume realtime table consumption
+   * @param tableName
+   */
+  public void resumeRealtimeTableConsumption(String tableName) {
+    TableConfig tableConfig = _helixResourceManager.getTableConfig(tableName, 
TableType.REALTIME);
+    String realtimeTableName = 
TableNameBuilder.REALTIME.tableNameWithType(tableName);
+
+    InstancePartitions instancePartitions =
+        
InstancePartitionsUtils.fetchOrComputeInstancePartitions(_helixResourceManager.getHelixZkManager(),
 tableConfig,
+            InstancePartitionsType.CONSUMING);
+    Map<InstancePartitionsType, InstancePartitions> instancePartitionsMap =
+        Collections.singletonMap(InstancePartitionsType.CONSUMING, 
instancePartitions);
+    IdealState idealState =
+        
HelixHelper.getTableIdealState(_helixResourceManager.getHelixZkManager(), 
realtimeTableName);
+    int numReplicas = getNumReplicas(tableConfig, instancePartitions);
+    Map<String, Map<String, String>> instanceStatesMap = 
idealState.getRecord().getMapFields();
+
+    PartitionLevelStreamConfig streamConfig = new 
PartitionLevelStreamConfig(tableConfig.getTableName(),
+        IngestionConfigUtils.getStreamConfigMap(tableConfig));
+    List<PartitionGroupConsumptionStatus> 
currentPartitionGroupConsumptionStatusList =
+        getPartitionGroupConsumptionStatusList(idealState, streamConfig);
+    // Read the smallest offset when a new partition is detected
+    OffsetCriteria originalOffsetCriteria = streamConfig.getOffsetCriteria();
+    streamConfig.setOffsetCriteria(OffsetCriteria.SMALLEST_OFFSET_CRITERIA);
+    List<PartitionGroupMetadata> newPartitionGroupMetadataList =
+        getNewPartitionGroupMetadataList(streamConfig, 
currentPartitionGroupConsumptionStatusList);
+    streamConfig.setOffsetCriteria(originalOffsetCriteria);
+
+    int numPartitionGroups = newPartitionGroupMetadataList.size();
+    Map<Integer, SegmentZKMetadata> partitionToLatestSegment = 
getLatestSegmentZKMetadataMap(realtimeTableName);
+    for (PartitionGroupMetadata partitionGroupMetadata : 
newPartitionGroupMetadataList) {

Review Comment:
   imo this is okay, as we have all logic in one place and we're not just 
creating new partition groups but running the whole flow with all the cases. My 
main concern was that we were just doing half of the things



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