ijuma commented on code in PR #18726:
URL: https://github.com/apache/kafka/pull/18726#discussion_r1976186661
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clients/src/main/resources/common/message/FetchResponse.json:
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@@ -106,7 +106,7 @@
]},
{ "name": "PreferredReadReplica", "type": "int32", "versions": "11+",
"default": "-1", "ignorable": false, "entityType": "brokerId",
"about": "The preferred read replica for the consumer to use on its
next fetch request."},
- { "name": "Records", "type": "records", "versions": "0+",
"nullableVersions": "0+", "about": "The record data."}
Review Comment:
@junrao I don't think we can break so many clients in the wild. That would
definitely require a KIP (and I would be against a KIP that did that
immediately - it would require years of notice). So, we'd have to specify very
clearly when null can or cannot be set. Your proposed definition doesn't
actually cover the case that breaks librdkafka: [authz
errors](https://github.com/confluentinc/librdkafka/blob/876cf4a7e4a339fda8cea1c4a650c168a351a176/tests/0119-consumer_auth.cpp#L141).
My take:
1. I can remove non-nullable from the schema if people feel strongly.
2. But I will still make sure the Kafka code never returns null for records.
It's actually more work to ensure the latter without the former, but I am ok
going that direction. I am not ok with any solution that breaks recently
released and widely deployed clients.
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