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https://issues.apache.org/jira/browse/KAFKA-5604?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17061275#comment-17061275
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Xiang Zhang commented on KAFKA-5604:
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Also, under that TODO marker, it says "this should actually never happen", I am
confused by that because ProducerFencedException is always possible where two
transactional instances exist at the same moment.
> All producer methods should raise `ProducerFencedException` after the first
> time.
> ---------------------------------------------------------------------------------
>
> Key: KAFKA-5604
> URL: https://issues.apache.org/jira/browse/KAFKA-5604
> Project: Kafka
> Issue Type: Bug
> Reporter: Apurva Mehta
> Assignee: Apurva Mehta
> Priority: Major
>
> Currently, when a `ProducerFencedException` is raised from a transactional
> producer, the expectation is that the application should call `close`
> immediately. However, if the application calls other producer methods, they
> would get a `KafkaException`. This is a bit confusing, and results in tickets
> like : https://issues.apache.org/jira/browse/KAFKA-5603.
> We should update the producer so that calls to any method other than `close`
> should raise a `ProducerFencedException` after the first time it is raised.
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