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https://issues.apache.org/jira/browse/KAFKA-3017?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15065227#comment-15065227
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Manikumar Reddy commented on KAFKA-3017:
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The Internet standards (Requests for Comments) for protocols mandate that
component hostname labels may contain only the ASCII letters 'a' through 'z'
(in a case-insensitive manner), the digits '0' through '9', and the hyphen ('-')
https://en.wikipedia.org/wiki/Hostname#Restrictions_on_valid_host_names
> hostnames with underscores '_' are not valid
> --------------------------------------------
>
> Key: KAFKA-3017
> URL: https://issues.apache.org/jira/browse/KAFKA-3017
> Project: Kafka
> Issue Type: Bug
> Affects Versions: 0.9.0.0
> Reporter: Michael Martin
> Original Estimate: 4h
> Remaining Estimate: 4h
>
> Affects server.properties host.name and advertised.host.name
> {code}
> kafka_1 | (kafka.server.KafkaConfig)
> kafka_1 | [2015-12-19 04:08:53,900] FATAL (kafka.Kafka$)
> kafka_1 | kafka.common.KafkaException: Unable to parse
> PLAINTEXT://kafka_kafka_1:9092 to a broker endpoint
> kafka_1 | at kafka.cluster.EndPoint$.createEndPoint(EndPoint.scala:49)
> kafka_1 | at
> kafka.utils.CoreUtils$$anonfun$listenerListToEndPoints$1.apply(CoreUtils.scala:309)
> kafka_1 | at
> kafka.utils.CoreUtils$$anonfun$listenerListToEndPoints$1.apply(CoreUtils.scala:309)
> {code}
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