vamossagar12 commented on code in PR #13095:
URL: https://github.com/apache/kafka/pull/13095#discussion_r1069260140


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tests/kafkatest/services/performance/end_to_end_latency.py:
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@@ -87,7 +87,7 @@ def start_cmd(self, node):
         cmd = "export KAFKA_LOG4J_OPTS=\"-Dlog4j.configuration=file:%s\"; " % 
EndToEndLatencyService.LOG4J_CONFIG
         if node.version.consumer_supports_bootstrap_server():
             cmd += "KAFKA_OPTS=%(kafka_opts)s %(kafka_run_class)s 
%(java_class_name)s " % args
-            cmd += "%(bootstrap_servers)s %(topic)s %(num_records)d %(acks)d 
%(message_bytes)d %(config_file)s" % args
+            cmd += "-b %(bootstrap_servers)s -t %(topic)s -n %(num_records)d 
-a %(acks)d -s %(message_bytes)d -f %(config_file)s" % args

Review Comment:
   This change and 
https://github.com/apache/kafka/pull/13095/files#diff-1a3735187400a54aac5a802fb2d2ff6d4fe9cdfbc5fd953a45e2890ad43f58cfR157-R207
 are needed because in argparse4j, if we are using positional arguments, then 
from what I understood, they can't be made optional. Properties file is an 
optional argument as per the scala code but it worked in that case as the main 
arguments were used as is. 



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