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https://issues.apache.org/jira/browse/KAFKA-5364?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Apurva Mehta reopened KAFKA-5364:
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> Producer attempts to send transactional messages before adding partitions to
> transaction
> ----------------------------------------------------------------------------------------
>
> Key: KAFKA-5364
> URL: https://issues.apache.org/jira/browse/KAFKA-5364
> Project: Kafka
> Issue Type: Sub-task
> Components: clients, core, producer
> Affects Versions: 0.11.0.0
> Reporter: Apurva Mehta
> Assignee: Apurva Mehta
> Priority: Blocker
> Labels: exactly-once
> Fix For: 0.11.0.0
>
> Attachments: KAFKA-5364.tar.gz
>
>
> Due to a race condition between the sender thread and the producer.send(),
> the following is possible:
> # In KakfaProducer.doSend(), we add partitions to the transaction and then do
> accumulator.append.
> # In Sender.run(), we check whether there are transactional request. If there
> are, we send them and wait for the response.
> # If there aren't we drain the accumulator queue and send the produce
> requests.
> # The problem is that the sequence step 2, 1, 3 is entire possible. This
> means that we won't send the 'AddPartitions' request but yet try to send the
> produce data. Which results in a fatal error and requires the producer to
> close.
> The solution is that in the accumulator.drain, we should check again if there
> are pending add partitions requests, and if so, don't drain anything.
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