[jira] [Updated] (KAFKA-1548) Refactor the "replica_id" in requests

["Neha Narkhede (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/KAFKA-1548?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Neha Narkhede updated KAFKA-1548:
---------------------------------
    Reviewer: Neha Narkhede

> 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: Gwen Shapira
>              Labels: newbie
>             Fix For: 0.9.0
>
>
> 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 also 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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