FrankChen021 commented on a change in pull request #10551:
URL: https://github.com/apache/druid/pull/10551#discussion_r519519629



##########
File path: 
extensions-core/kafka-indexing-service/src/main/java/org/apache/druid/indexing/kafka/KafkaConsumerConfigs.java
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@@ -38,7 +38,6 @@
     props.put("group.id", StringUtils.format("kafka-supervisor-%s", 
IdUtils.getRandomId()));
     props.put("auto.offset.reset", "none");
     props.put("enable.auto.commit", "false");
-    props.put("isolation.level", "read_committed");

Review comment:
       We don't know whether or not the users have enabled transactional 
message in their clusters, so changing the current behavior may cause backward 
compatibility problem. 




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