[GitHub] [kafka] ijuma commented on a change in pull request #10675: KAFKA-12574: remove internal Producer config and auto downgrade logic

[GitBox <gi...@apache.org>]

ijuma commented on a change in pull request #10675:
URL: https://github.com/apache/kafka/pull/10675#discussion_r630612053



##########
File path: clients/src/main/java/org/apache/kafka/common/requests/TxnOffsetCommitRequest.java
##########
@@ -88,26 +84,13 @@ public Builder(final String transactionalId,
                             .setMemberId(memberId)
                             .setGenerationId(generationId)
                             .setGroupInstanceId(groupInstanceId.orElse(null));
-            this.autoDowngrade = autoDowngrade;
         }
 
         @Override
         public TxnOffsetCommitRequest build(short version) {
             if (version < 3 && groupMetadataSet()) {
-                if (autoDowngrade) {
-                    log.trace("Downgrade the request by resetting group metadata fields: " +
-                                  "[member.id:{}, generation.id:{}, group.instance.id:{}], because broker " +
-                                  "only supports TxnOffsetCommit version {}. Need " +
-                                  "v3 or newer to enable this feature",
-                        data.memberId(), data.generationId(), data.groupInstanceId(), version);
-
-                    data.setGenerationId(JoinGroupRequest.UNKNOWN_GENERATION_ID)
-                        .setMemberId(JoinGroupRequest.UNKNOWN_MEMBER_ID)
-                        .setGroupInstanceId(null);
-                } else {
-                    throw new UnsupportedVersionException("Broker unexpectedly " +
+                throw new UnsupportedVersionException("Broker unexpectedly " +

Review comment:
       I think we can improve this message a little:
   1. Remove `unexpectedly` since it doesn't add much value and it's a bit confusing (it makes it sound like there's a broker bug)
   2. Include the minimum version required (`3`) in the message.




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