Jiangjie Qin created KAFKA-3197:
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Summary: Producer can send message out of order even when in
flight request is set to 1.
Key: KAFKA-3197
URL: https://issues.apache.org/jira/browse/KAFKA-3197
Project: Kafka
Issue Type: Bug
Components: clients, producer
Affects Versions: 0.9.0.0
Reporter: Jiangjie Qin
Assignee: Jun Rao
Fix For: 0.9.0.1
The issue we saw is following:
1. Producer send message 0 to topic-partition-0 on broker A. The in-flight
request to broker A is 1.
2. The request is somehow lost
3. Producer refreshed its topic metadata and found leader of topic-partition-0
migrated from broker A to broker B.
4. Because there is no in-flight request to broker B. All the subsequent
messages to topic-partition-0 in the record accumulator are sent to broker B.
5. Later on when the request in step (1) times out, message 0 will be retried
and sent to broker B. At this point, all the later messages has already been
sent, so we have re-order.
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