[jira] [Created] (KAFKA-5376) Transactions: Concurrent transactional consumer reads aborted messages

["Apurva Mehta (JIRA)" <ji...@apache.org>]

Apurva Mehta created KAFKA-5376:
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             Summary: Transactions: Concurrent transactional consumer reads aborted messages
                 Key: KAFKA-5376
                 URL: https://issues.apache.org/jira/browse/KAFKA-5376
             Project: Kafka
          Issue Type: Bug
            Reporter: Apurva Mehta
            Assignee: Jason Gustafson
            Priority: Blocker


This may be a dup of KAFKA-5355, but the system tests in KAFKA-5366 shows that a concurrent transactional consumer reads aborted messages. For the test in question the clients are bounced 6 times. With a transaction size of 500, we expect 3000 aborted messages. The concurrent consumer regularly over counts by 1000 to 1500 messages, suggesting that some aborted transactions are consumed. 

{noformat}
--------------------------------------------------------------------------------
test_id:    kafkatest.tests.core.transactions_test.TransactionsTest.test_transactions.failure_mode=clean_bounce.bounce_target=clients
status:     FAIL
run time:   1 minute 56.102 seconds


    Detected 1000 dups in concurrently consumed messages
Traceback (most recent call last):
  File "/usr/local/lib/python2.7/dist-packages/ducktape/tests/runner_client.py", line 123, in run
    data = self.run_test()
  File "/usr/local/lib/python2.7/dist-packages/ducktape/tests/runner_client.py", line 176, in run_test
    return self.test_context.function(self.test)
  File "/usr/local/lib/python2.7/dist-packages/ducktape/mark/_mark.py", line 321, in wrapper
    return functools.partial(f, *args, **kwargs)(*w_args, **w_kwargs)
  File "/opt/kafka-dev/tests/kafkatest/tests/core/transactions_test.py", line 235, in test_transactions
    assert num_dups_in_concurrent_consumer == 0, "Detected %d dups in concurrently consumed messages" % num_dups_in_concurrent_consumer
AssertionError: Detected 1000 dups in concurrently consumed messages
{noformat}

This behavior continues even after https://github.com/apache/kafka/pull/3221 was merged. 



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