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https://issues.apache.org/jira/browse/KAFKA-14658?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Colin McCabe resolved KAFKA-14658.
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Resolution: Fixed
> When listening on fixed ports, defer port opening until we're ready
> -------------------------------------------------------------------
>
> Key: KAFKA-14658
> URL: https://issues.apache.org/jira/browse/KAFKA-14658
> Project: Kafka
> Issue Type: Bug
> Reporter: Colin McCabe
> Assignee: Colin McCabe
> Priority: Major
>
> When we are listening on fixed ports, we should defer opening ports until
> we're ready to accept traffic. If we open the broker port too early, it can
> confuse monitoring and deployment systems. This is a particular concern when
> in KRaft mode, since in that mode, we create the SocketServer object earlier
> in the startup process than when in ZK mode.
> The approach taken in this PR is to defer opening the acceptor port until
> Acceptor.start is called. Note that when we are listening on a random port,
> we continue to open the port "early," in the SocketServer constructor. The
> reason for doing this is that there is no other way to find the random port
> number the kernel has selected. Since random port assignment is not used in
> production deployments, this should be reasonable.
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