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https://issues.apache.org/jira/browse/KAFKA-1548?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Work on KAFKA-1548 stopped by Balint Molnar.
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> Refactor the "replica_id" in requests
> -------------------------------------
>
> Key: KAFKA-1548
> URL: https://issues.apache.org/jira/browse/KAFKA-1548
> Project: Kafka
> Issue Type: Bug
> Reporter: Guozhang Wang
> Assignee: Balint Molnar
> Priority: Minor
> Labels: newbie
> Fix For: 0.10.3.0
>
>
> Today in many requests like fetch and offset we have a integer replica_id
> field, if the request is from a follower consumer it is the broker id from
> that follower replica, if it is from a regular consumer it could be one of
> the two values: "-1" for ordinary consumer, or "-2" for debugging consumer.
> Hence this replica_id field is used in two folds:
> 1) Logging for trouble shooting in request logs, which can be helpful only
> when this is from a follower replica,
> 2) Deciding if it is from the consumer or a replica to logically handle the
> request in different ways. For this purpose we do not really care about the
> actually id value.
> We probably would like to do the following improvements:
> 1) Rename "replica_id" to sth. less confusing?
> 2) Change the request.toString() function based on the replica_id, whether it
> is a positive integer (meaning from a broker replica fetcher) or -1/-2
> (meaning from a regular consumer).
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