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https://issues.apache.org/jira/browse/KAFKA-2842?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15006589#comment-15006589
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Ismael Juma commented on KAFKA-2842:
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I think this is intentional because of RFC952:
<hname> ::= <name>*["."<name>]
<name> ::= <let>[*[<let-or-digit-or-hyphen>]<let-or-digit>]
https://tools.ietf.org/html/rfc952
> BrokerEndPoint regex does't support hostname with _
> ---------------------------------------------------
>
> Key: KAFKA-2842
> URL: https://issues.apache.org/jira/browse/KAFKA-2842
> Project: Kafka
> Issue Type: Bug
> Reporter: Sachin Pasalkar
> Priority: Minor
>
> If you look at the code of BrokerEndPoint.scala, it has regex uriParseExp.
> This regex is used for validation of brokers. However, it fails to validate
> hostname with _ in it. e.g. adfs_212:9092
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