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https://issues.apache.org/jira/browse/KAFKA-3719?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15287422#comment-15287422
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Gwen Shapira commented on KAFKA-3719:
-------------------------------------
AFAIK, underscores are not legal in hostnames. See
https://tools.ietf.org/html/rfc952
" A "name" (Net, Host, Gateway, or Domain name) is a text string up
to 24 characters drawn from the alphabet (A-Z), digits (0-9), minus
sign (-), and period (.). Note that periods are only allowed when
they serve to delimit components of "domain style names". (See
RFC-921, "Domain Name System Implementation Schedule", for
background). No blank or space characters are permitted as part of a
name. No distinction is made between upper and lower case. The first
character must be an alpha character. The last character must not be
a minus sign or period. A host which serves as a GATEWAY should have
"-GATEWAY" or "-GW" as part of its name. Hosts which do not serve as
Internet gateways should not use "-GATEWAY" and "-GW" as part of
their names. A host which is a TAC should have "-TAC" as the last
part of its host name, if it is a DoD host. Single character names
or nicknames are not allowed."
> Pattern regex org.apache.kafka.common.utils.Utils.HOST_PORT_PATTERN is too
> narrow
> ---------------------------------------------------------------------------------
>
> Key: KAFKA-3719
> URL: https://issues.apache.org/jira/browse/KAFKA-3719
> Project: Kafka
> Issue Type: Bug
> Reporter: Balazs Kossovics
> Priority: Trivial
>
> In our continuous integration environment the Kafka brokers run on hosts
> containing underscores in their names. The current regex splits incorrectly
> these names into host and port parts.
> I could submit a pull request if someone confirms that this is indeed a bug.
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