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https://issues.apache.org/jira/browse/KAFKA-5376?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16036170#comment-16036170
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Jason Gustafson commented on KAFKA-5376:
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[~apurva] Please post the log data from one of the failing test runs.
> 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
> Labels: exactly-once
>
> 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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