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https://issues.apache.org/jira/browse/KAFKA-6768?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16431168#comment-16431168
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Jason Gustafson commented on KAFKA-6768:
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Initially I thought this affected 1.1.0, but the regression was only in trunk. 

> 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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