Rajini Sivaram created KAFKA-8688:
-------------------------------------
Summary: Upgrade system tests fail due to data loss with older
message format
Key: KAFKA-8688
URL: https://issues.apache.org/jira/browse/KAFKA-8688
Project: Kafka
Issue Type: Bug
Components: system tests
Reporter: Rajini Sivaram
Assignee: Rajini Sivaram
System test failure for TestUpgrade/test_upgrade: from_kafka_version=0.9.0.1,
to_message_format_version=0.9.0.1, compression_types=.lz4
{code:java}
3 acked message did not make it to the Consumer. They are: [33906, 33900,
33903]. The first 3 missing messages were validated to ensure they are in
Kafka's data files. 3 were missing. This suggests data loss. Here are some of
the messages not found in the data files: [33906, 33900, 33903]
Traceback (most recent call last):
File
"/home/jenkins/workspace/system-test-kafka_5.3.x/kafka/venv/local/lib/python2.7/site-packages/ducktape-0.7.5-py2.7.egg/ducktape/tests/runner_client.py",
line 132, in run
data = self.run_test()
File
"/home/jenkins/workspace/system-test-kafka_5.3.x/kafka/venv/local/lib/python2.7/site-packages/ducktape-0.7.5-py2.7.egg/ducktape/tests/runner_client.py",
line 189, in run_test
return self.test_context.function(self.test)
File
"/home/jenkins/workspace/system-test-kafka_5.3.x/kafka/venv/local/lib/python2.7/site-packages/ducktape-0.7.5-py2.7.egg/ducktape/mark/_mark.py",
line 428, in wrapper
return functools.partial(f, *args, **kwargs)(*w_args, **w_kwargs)
File
"/home/jenkins/workspace/system-test-kafka_5.3.x/kafka/tests/kafkatest/tests/core/upgrade_test.py",
line 136, in test_upgrade
self.run_produce_consume_validate(core_test_action=lambda:
self.perform_upgrade(from_kafka_version,
File
"/home/jenkins/workspace/system-test-kafka_5.3.x/kafka/tests/kafkatest/tests/produce_consume_validate.py",
line 112, in run_produce_consume_validate
self.validate()
File
"/home/jenkins/workspace/system-test-kafka_5.3.x/kafka/tests/kafkatest/tests/produce_consume_validate.py",
line 135, in validate
assert succeeded, error_msg
AssertionError: 3 acked message did not make it to the Consumer. They are:
[33906, 33900, 33903]. The first 3 missing messages were validated to ensure
they are in Kafka's data files. 3 were missing. This suggests data loss. Here
are some of the messages not found in the data files: [33906, 33900, 33903]
{code}
Logs show:
# Broker 1 is leader of partition
# Broker 2 successfully fetches from offset 10947 and processes request
# Broker 2 sends fetch request to broker 1 for offset 10950
# Broker 1 sets is HW to 10950, acknowledges produce requests up to HW
# Broker 2 is elected leader
# Broker 2 truncates to its local HW of 10947 - 3 messages are lost
This data loss is a known issue that was fixed under KIP-101. But since this
can still happen with older messages formats, we should update upgrade tests to
cope with some data loss.
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