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https://issues.apache.org/jira/browse/KAFKA-955?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Guozhang Wang updated KAFKA-955:
--------------------------------
Attachment: KAFKA-955.v3.patch
Add the testMessageSizeTooLargeWithAckZero to syncProducerTest, which:
1. First send a large message that will cause the MessageSizeTooLarge
exception, and hence close the socket. But this message will be silently
dropped and lost.
2. Then send another large message, but just to make sure its size exceeds the
buffer size so the socket buffer will be flushed immediately; this send should
fail since the socket has been closed.
> 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
>
>
> 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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