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https://issues.apache.org/jira/browse/KAFKA-955?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13752583#comment-13752583
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Jay Kreps commented on KAFKA-955:
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+1 Gorgeous.
> After a leader change, messages sent with ack=0 are lost
> --------------------------------------------------------
>
> Key: KAFKA-955
> URL: https://issues.apache.org/jira/browse/KAFKA-955
> Project: Kafka
> Issue Type: Bug
> Reporter: Jason Rosenberg
> Assignee: Guozhang Wang
> Attachments: KAFKA-955.v1.patch, KAFKA-955.v1.patch,
> KAFKA-955.v2.patch, KAFKA-955.v3.patch, KAFKA-955.v4.patch,
> KAFKA-955.v5.patch, KAFKA-955.v6.patch, KAFKA-955.v7.patch
>
>
> If the leader changes for a partition, and a producer is sending messages
> with ack=0, then messages will be lost, since the producer has no active way
> of knowing that the leader has changed, until it's next metadata refresh
> update.
> The broker receiving the message, which is no longer the leader, logs a
> message like this:
> Produce request with correlation id 7136261 from client on partition
> [mytopic,0] failed due to Leader not local for partition [mytopic,0] on
> broker 508818741
> This is exacerbated by the controlled shutdown mechanism, which forces an
> immediate leader change.
> A possible solution to this would be for a broker which receives a message,
> for a topic that it is no longer the leader for (and if the ack level is 0),
> then the broker could just silently forward the message over to the current
> leader.
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