siddharthteotia commented on code in PR #8989:
URL: https://github.com/apache/pinot/pull/8989#discussion_r919557304


##########
pinot-controller/src/main/java/org/apache/pinot/controller/helix/core/assignment/instance/InstanceAssignmentDriver.java:
##########
@@ -55,19 +58,36 @@ public InstanceAssignmentDriver(TableConfig tableConfig) {
   public InstancePartitions assignInstances(InstancePartitionsType 
instancePartitionsType,
       List<InstanceConfig> instanceConfigs, @Nullable InstancePartitions 
existingInstancePartitions) {
     String tableNameWithType = _tableConfig.getTableName();
-    LOGGER.info("Starting {} instance assignment for table: {}", 
instancePartitionsType, tableNameWithType);
+    Preconditions.checkState(!TableConfigUtils.isTableInGroup(_tableConfig));
 
     InstanceAssignmentConfig assignmentConfig =
         
InstanceAssignmentConfigUtils.getInstanceAssignmentConfig(_tableConfig, 
instancePartitionsType);
+    String instancePartitionsName = 
instancePartitionsType.getInstancePartitionsName(
+        TableNameBuilder.extractRawTableName(tableNameWithType));
+    return assignInstances(instancePartitionsName,
+        tableNameWithType, instanceConfigs, assignmentConfig, 
existingInstancePartitions);
+  }
+
+  public static InstancePartitions assignInstancesToGroup(String groupName,
+      List<InstanceConfig> instanceConfigs, InstanceAssignmentConfig 
assignmentConfig) {
+    String instancePartitionsName = 
InstancePartitionsUtils.getGroupInstancePartitionsName(groupName);
+    return assignInstances(instancePartitionsName, groupName, instanceConfigs, 
assignmentConfig, null);
+  }
+
+  private static InstancePartitions assignInstances(String 
instancePartitionsName, String entityName,

Review Comment:
   Not sure I understand the concept of `entityName` and why is it needed. Can 
you please elaborate ?



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