David Arthur created KAFKA-14263:
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             Summary: Investigate flaky upgrade_test.py (missing messages)
                 Key: KAFKA-14263
                 URL: https://issues.apache.org/jira/browse/KAFKA-14263
             Project: Kafka
          Issue Type: Test
    Affects Versions: 3.3.0
            Reporter: David Arthur


During system tests, we occasionally see flaky failures of upgrade_test.py. 

Here is one such recent failure on the 3.3 branch:

{code}
Module: kafkatest.tests.core.upgrade_test
Class:  TestUpgrade
Method: test_upgrade
Arguments:
{
  "compression_types": [
    "none"
  ],
  "from_kafka_version": "0.9.0.1",
  "to_message_format_version": "0.9.0.1"
}
{code}

{code}
AssertionError("2 acked message did not make it to the Consumer. They are: 
[21017, 21014]. We validated that the first 2 of these missing messages 
correctly made it into Kafka's data files. This suggests they were lost on 
their way to the consumer.")
{code}

It would be good to try and reproduce these types of failures and see how we 
can make the test more robust.



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