itantiger commented on a change in pull request #8753:
URL: https://github.com/apache/kafka/pull/8753#discussion_r549126199



##########
File path: core/src/main/scala/kafka/tools/ConsumerPerformance.scala
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@@ -271,13 +271,22 @@ object ConsumerPerformance extends LazyLogging {
 
     val brokerHostsAndPorts = options.valueOf(if 
(options.has(bootstrapServerOpt)) bootstrapServerOpt else brokerListOpt)
     props.put(ConsumerConfig.BOOTSTRAP_SERVERS_CONFIG, brokerHostsAndPorts)
-    props.put(ConsumerConfig.GROUP_ID_CONFIG, options.valueOf(groupIdOpt))
-    props.put(ConsumerConfig.RECEIVE_BUFFER_CONFIG, 
options.valueOf(socketBufferSizeOpt).toString)
-    props.put(ConsumerConfig.MAX_PARTITION_FETCH_BYTES_CONFIG, 
options.valueOf(fetchSizeOpt).toString)
-    props.put(ConsumerConfig.AUTO_OFFSET_RESET_CONFIG, if 
(options.has(resetBeginningOffsetOpt)) "latest" else "earliest")
-    props.put(ConsumerConfig.KEY_DESERIALIZER_CLASS_CONFIG, 
classOf[ByteArrayDeserializer])
-    props.put(ConsumerConfig.VALUE_DESERIALIZER_CLASS_CONFIG, 
classOf[ByteArrayDeserializer])
-    props.put(ConsumerConfig.CHECK_CRCS_CONFIG, "false")
+    if (props.getProperty(ConsumerConfig.GROUP_ID_CONFIG) == null)

Review comment:
       I had forked once again and then updated the code (according to your 
suggestion). Can you take a look at this?
   [https://github.com/apache/kafka/pull/9790](url)




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