Apurva Mehta created KAFKA-4215:
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Summary: Consumers miss messages during partition reassignment
Key: KAFKA-4215
URL: https://issues.apache.org/jira/browse/KAFKA-4215
Project: Kafka
Issue Type: Bug
Reporter: Apurva Mehta
Assignee: Apurva Mehta
In the specific case where the replication-factor of a topic is 1, when
partition reassignment is ongoing, and when a broker is bounced, consumers
reliably lose some messages in the stream.
This can be reproduced in system tests where the following error message sis
observed:
{noformat}
AssertionError: 737 acked message did not make it to the Consumer. They are:
22530, 45059, 22534, 45063, 22538, 45067, 22542, 45071, 22546, 45075, 22550,
45079, 22554, 45083, 22558, 45087, 22562, 45091, 22566, 45095, ...plus 717
more. Total Acked: 51809, Total Consumed: 51073. We validated that the first
737 of these missing messages correctly made it into Kafka's data files. This
suggests they were lost on their way to the consumer.
{noformat}
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