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https://issues.apache.org/jira/browse/KAFKA-17601?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17896849#comment-17896849
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Chia-Ping Tsai commented on KAFKA-17601:
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The root cause is that we set the clientInformation "after" the
`RequestContext` is created. Hence, there is only empty clientInformation.
https://github.com/apache/kafka/blob/trunk/core/src/main/scala/kafka/network/SocketServer.scala#L1145
we will file a patch to fix it later
> Inter-broker connections do not expose their clientSoftwareName and
> clientSoftwareVersion tags
> ----------------------------------------------------------------------------------------------
>
> Key: KAFKA-17601
> URL: https://issues.apache.org/jira/browse/KAFKA-17601
> Project: Kafka
> Issue Type: Bug
> Affects Versions: 3.6.1
> Reporter: Tamas Kornai
> Priority: Minor
>
> [KIP-511|[https://cwiki.apache.org/confluence/display/KAFKA/KIP-511%3A+Collect+and+Expose+Client%27s+Name+and+Version+in+the+Brokers]]
> made it possible to see what library versions are used by the Kafka clients.
> When Kafka brokers are connecting to other brokers this information is not
> properly populated, we see the "unknown" value instead for both
> `ClientSoftwareName` and `ClientSoftwareVersion`.
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