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https://issues.apache.org/jira/browse/KAFKA-18935?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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TengYao Chi resolved KAFKA-18935.
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Resolution: Fixed
> Ensure brokers do not return null records in FetchResponse
> ----------------------------------------------------------
>
> Key: KAFKA-18935
> URL: https://issues.apache.org/jira/browse/KAFKA-18935
> Project: Kafka
> Issue Type: Improvement
> Reporter: Ismael Juma
> Assignee: TengYao Chi
> Priority: Major
>
> As part of KIP-896, we discovered that all known versions of librdkafka (and
> related clients) fail if the returned records are null. The specific example
> that caused a failure in their test suite was a fetch response where
> authorization failed.
> We fixed the code not to return null records and originally also changed the
> schema to make the records not nullable. However, the latter was problematic
> and we reverted it via [https://github.com/apache/kafka/pull/19131] (the
> reasons are explained there).
> In order to make sure we don't regress, we should consider introducing
> validation and/or tests that ensure brokers do not return null records in
> fetch responses.
> This issue is for changes that do not involve schema definition changes.
> KAFKA-18934 tracks schema related changes (which can only be done for newer
> versions of fetch request/response).
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