David Jacot created KAFKA-14536:
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Summary: SessionId in FetchResponse should be ignorable
Key: KAFKA-14536
URL: https://issues.apache.org/jira/browse/KAFKA-14536
Project: Kafka
Issue Type: Bug
Reporter: David Jacot
Assignee: David Jacot
SessionId was introduced in version 7 of the Fetch API. It is not ignorable in
the schema definition and we have no code in the broker to not set it when an
older version is used.
It seems that we regressed when we switched the Fetch API from the struct based
serialization to the automated protocol.
[Here|https://github.com/apache/kafka/commit/4cd2396db31418c90005c998d9107ad40df055b2#diff-1ef70ab50c661cda6afb43edf35d5d0af011b83d6da3731cca73f77756a38d40L538].
We previously used `struct.setIfExists(SESSION_ID, sessionId);` which did that
for us.
Interestingly, it seems that our upgrade system tests did not catch it. I will
investigate this further.
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