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https://issues.apache.org/jira/browse/KAFKA-12161?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17261681#comment-17261681
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Jason Gustafson commented on KAFKA-12161:
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[~bchen225242] That's not a bad idea. However, we are constrained a little bit
since Fetch requires an int32 replicaId. I think it might be simpler for the
moment to make the field optional and treat non-participating observers more
like consumers.
> Raft observers should not require an id to fetch
> ------------------------------------------------
>
> Key: KAFKA-12161
> URL: https://issues.apache.org/jira/browse/KAFKA-12161
> Project: Kafka
> Issue Type: Sub-task
> Reporter: Jason Gustafson
> Assignee: Jason Gustafson
> Priority: Major
>
> It is useful to allow observers to replay the metadata log without requiring
> a replica id. For example, this can be used by tools in order to inspect the
> current metadata state. In order to support this, we should modify
> `KafkaRaftClient` so that the broker id is not required.
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