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https://issues.apache.org/jira/browse/KAFKA-3827?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15339030#comment-15339030
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Ewen Cheslack-Postava commented on KAFKA-3827:
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[~junrao] Is that the behavior we really want? I don't think that turning
"down" the inter broker protocol or message format is a good idea, but whereas
you could potentially safely downgrade the protocol version (as long as all
brokers were also turned down to that version), if you already had messages
published in 0.10 format, it isn't safe to turn down the message format, is it?
> log.message.format.version should default to inter.broker.protocol.version
> --------------------------------------------------------------------------
>
> Key: KAFKA-3827
> URL: https://issues.apache.org/jira/browse/KAFKA-3827
> Project: Kafka
> Issue Type: Improvement
> Affects Versions: 0.10.0.0
> Reporter: Jun Rao
> Assignee: Manasvi Gupta
> Labels: newbie
>
> Currently, if one sets inter.broker.protocol.version to 0.9.0 and restarts
> the broker, one will get the following exception since
> log.message.format.version defaults to 0.10.0. It will be more intuitive if
> log.message.format.version defaults to the value of
> inter.broker.protocol.version.
> java.lang.IllegalArgumentException: requirement failed:
> log.message.format.version 0.10.0-IV1 cannot be used when
> inter.broker.protocol.version is set to 0.9.0.1
> at scala.Predef$.require(Predef.scala:233)
> at kafka.server.KafkaConfig.validateValues(KafkaConfig.scala:1023)
> at kafka.server.KafkaConfig.<init>(KafkaConfig.scala:994)
> at kafka.server.KafkaConfig$.fromProps(KafkaConfig.scala:743)
> at kafka.server.KafkaConfig$.fromProps(KafkaConfig.scala:740)
> at
> kafka.server.KafkaServerStartable$.fromProps(KafkaServerStartable.scala:28)
> at kafka.Kafka$.main(Kafka.scala:58)
> at kafka.Kafka.main(Kafka.scala)
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