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https://issues.apache.org/jira/browse/KAFKA-4825?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15902877#comment-15902877
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Ben Stopford commented on KAFKA-4825:
-------------------------------------
Thanks Jun. Makes sense.
> Likely Data Loss in ReassignPartitionsTest System Test
> ------------------------------------------------------
>
> Key: KAFKA-4825
> URL: https://issues.apache.org/jira/browse/KAFKA-4825
> Project: Kafka
> Issue Type: Bug
> Reporter: Ben Stopford
> Labels: reliability
> Attachments: problem.zip
>
>
> A failure in the below test may imply to a genuine missing message.
> kafkatest.tests.core.reassign_partitions_test.ReassignPartitionsTest.test_reassign_partitions.bounce_brokers=True.security_protocol=PLAINTEXT
> The test - which reassigns partition whilst bouncing cluster members -
> reconciles messages ack'd with messages received in the consumer.
> The interesting part is that we received two ack's for the same offset, with
> different messages:
> {"topic":"test_topic","partition":11,"name":"producer_send_success","value":"7447","time_ms":1488349980718,"offset":372,"key":null}
> {"topic":"test_topic","partition":11,"name":"producer_send_success","value":"7487","time_ms":1488349981780,"offset":372,"key":null}
> When searching the log files, via kafka.tools.DumpLogSegments, only the later
> message is found.
> The missing message lies midway through the test and appears to occur after a
> leader moves (after 7447 is sent there is a ~1s pause, then 7487 is sent,
> along with a backlog of messages for partitions 11, 16, 6).
> The overall implication is a message appears to be acknowledged but later
> lost.
> Looking at the test itself it seems valid. The producer is initialised with
> acks = -1. The callback checks for an exception in the onCompletion callback
> and uses this to track acknowledgement in the test.
> https://jenkins.confluent.io/job/system-test-kafka/521/console
> http://testing.confluent.io/confluent-kafka-system-test-results/?prefix=2017-03-01--001.1488363091--apache--trunk--c9872cb/ReassignPartitionsTest/test_reassign_partitions/bounce_brokers=True.security_protocol=PLAINTEXT/
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