m1a2st commented on code in PR #23665:
URL: https://github.com/apache/kafka/pull/23665#discussion_r4333098566
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clients/src/main/java/org/apache/kafka/common/requests/RequestHeader.java:
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@@ -137,11 +137,27 @@ public ResponseHeader toResponseHeader() {
return new ResponseHeader(data.correlationId(),
apiKey().responseHeaderVersion(apiVersion()));
Review Comment:
My understanding is that the original client version and the effective
version serve different purposes. For an unsupported `ApiVersionsRequest`, the
original version is N, while the effective version is 0. The current code still
works because `ApiVersions` always uses response header v0, but deriving both
formats from the effective version makes the response serialization more
consistent.
Based on this, I’ve updated both response serialization paths to use the
effective version. `KafkaApis` now uses the effective version, for handler
logic, while retaining the original version for the initial API-enabled check.
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