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https://issues.apache.org/jira/browse/KAFKA-6768?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jason Gustafson resolved KAFKA-6768.
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Resolution: Fixed
> Producer may hang in close with pending transaction
> ---------------------------------------------------
>
> Key: KAFKA-6768
> URL: https://issues.apache.org/jira/browse/KAFKA-6768
> Project: Kafka
> Issue Type: Bug
> Components: producer
> Reporter: Jason Gustafson
> Assignee: Jason Gustafson
> Priority: Major
> Fix For: 1.1.1
>
>
> There is an edge case for transactional producers which will cause close() to
> hang indefinitely (unless used with a timeout). Say, for example, that the
> producer is trying to send an AddPartitionsToTxn request to the broker. Upon
> shutdown, the Sender's running flag will be set to false and we will begin
> graceful shutdown. Graceful shutdown will not complete, however, until we can
> send the AddPartitionsToTxn request. But the latter is blocked by the fact
> that the running flag is disabled. So no progress can be made and shutdown
> cannot complete.
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