Dong Lin created KAFKA-4962:
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Summary: Unify the way of implementing schemas in Protocol.java
Key: KAFKA-4962
URL: https://issues.apache.org/jira/browse/KAFKA-4962
Project: Kafka
Issue Type: Improvement
Reporter: Dong Lin
The schemas implementation in Protocol.java is currently inconsistent. For
example, the implementation of `FETCH_REQUEST_V3` referenced
`FETCH_REQUEST_TOPIC_V0`. But the implementation of
`FETCH_RESPONSE_PARTITION_HEADER_V5` referenced
`FETCH_RESPONSE_ABORTED_TRANSACTION_V5` which has the same value of
`FETCH_RESPONSE_ABORTED_TRANSACTION_V4`.
To make the code consistent, we should either create and reference a sub-schema
with the same version for every schema implementation, or avoid creating new
sub-schema if that schema has the same value as an existing schema.
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