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https://issues.apache.org/jira/browse/KAFKA-6571?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16576931#comment-16576931
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Ahmed Al-Mehdi commented on KAFKA-6571:
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After discussion with Dong, assigning bug to self.
> KafkaProducer.close(0) should be non-blocking
> ---------------------------------------------
>
> Key: KAFKA-6571
> URL: https://issues.apache.org/jira/browse/KAFKA-6571
> Project: Kafka
> Issue Type: Bug
> Reporter: Dong Lin
> Assignee: Dong Lin
> Priority: Major
>
> According to the Java doc of producer.close(long timeout, TimeUnit timeUnit),
> it is said that "Specifying a timeout of zero means do not wait for pending
> send requests to complete". However, producer.close(0) can currently block on
> waiting for the sender thread to exit, which in turn can block on user's
> callback.
> We probably should not let producer.close(0) join the sender thread if user
> has specified zero timeout.
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