zhangyue19921010 commented on a change in pull request #10551:
URL: https://github.com/apache/druid/pull/10551#discussion_r521861277



##########
File path: 
extensions-core/kafka-indexing-service/src/main/java/org/apache/druid/indexing/kafka/KafkaConsumerConfigs.java
##########
@@ -30,15 +30,23 @@
  */
 public class KafkaConsumerConfigs
 {
-
-  public static Map<String, Object> getConsumerProperties()
+  public static Map<String, Object> getConsumerProperties(Map<String, Object> 
customerConsumerProperties)
   {
+    final Object value = 
customerConsumerProperties.remove("consumeTransactionally");

Review comment:
       Hi FrankChen021, I have put the new property `consumeTransactionally` in 
the `KafkaSupervisorIOConfig` directly. If users ignore this config or set this 
config true, Druid would consume Kafka transactionally same as current Druid 
behavior.
   
   Set `consumeTransactionally` false here can disable Druid to consume Kafka 
transactionally, meanwhile Druid could consume lower version of Kafka now like 
0.10.2.1 .
   
   In this way, we don't change current Druid default behavior and provide a 
way to a way to make Druid have the ability to consume different versions of 
Kafka and remove the hard limitation that Druid(after 0.15.0) only can consume 
Kafka version 0.11.x or better.
   
   I have tested this PR in our Dev Druid cluster.  Please take a look.
   




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