Guozhang Wang created KAFKA-1548:
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Summary: 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
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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