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https://issues.apache.org/jira/browse/KAFKA-3539?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17383368#comment-17383368
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Moses Nakamura commented on KAFKA-3539:
---------------------------------------

Looks like KafkaProducerTest is the main one that breaks.  Right now there are 
only two failing tests . . .

KafkaProducerTest > shouldCloseProperlyAndThrowIfInterrupted() FAILED
KafkaProducerTest > testFlushCompleteSendOfInflightBatches() FAILED

I don't think I've made any changes to the public API, it's only behavioral 
changes so far.  They're runtime failures, I was able to fix any compilation 
issues pretty easily.  Do you know who someone more active in this part of the 
codebase is?

> KafkaProducer.send() may block even though it returns the Future
> ----------------------------------------------------------------
>
>                 Key: KAFKA-3539
>                 URL: https://issues.apache.org/jira/browse/KAFKA-3539
>             Project: Kafka
>          Issue Type: Bug
>          Components: producer 
>            Reporter: Oleg Zhurakousky
>            Priority: Critical
>              Labels: needs-discussion, needs-kip
>
> You can get more details from the us...@kafka.apache.org by searching on the 
> thread with the subject "KafkaProducer block on send".
> The bottom line is that method that returns Future must never block, since it 
> essentially violates the Future contract as it was specifically designed to 
> return immediately passing control back to the user to check for completion, 
> cancel etc.



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