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https://issues.apache.org/jira/browse/KAFKA-3834?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15339050#comment-15339050
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Ewen Cheslack-Postava commented on KAFKA-3834:
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Is returning an empty record set even what we want to do? Why not just throw an 
exception that indicates the underlying error? (Which has the benefit of making 
applications aware of the real issue and hopefully alleviating you of having to 
answer questions about why they are getting errors)?

> Consumer should not block in poll on coordinator discovery
> ----------------------------------------------------------
>
>                 Key: KAFKA-3834
>                 URL: https://issues.apache.org/jira/browse/KAFKA-3834
>             Project: Kafka
>          Issue Type: Improvement
>          Components: consumer
>            Reporter: Jason Gustafson
>            Assignee: Jason Gustafson
>
> Currently we block indefinitely in poll() when discovering the coordinator 
> for the group. Instead, we can return an empty record set when the passed 
> timeout expires. The downside is that it may obscure the underlying problem 
> (which is usually misconfiguration), but users typically have to look at the 
> logs to figure out the problem anyway. 



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