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https://issues.apache.org/jira/browse/KAFKA-18060?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17900011#comment-17900011
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Chia-Ping Tsai commented on KAFKA-18060:
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Maybe we can add following check to fix it.

        // Supports the v0-v2 TxnOffsetCommitRequest
        if (apiVersion <3 && isTransactional && memberEpoch == 
JoinGroupRequest.UNKNOWN_GENERATION_ID &&
                memberId.equals(JoinGroupRequest.UNKNOWN_MEMBER_ID) && 
groupInstanceId == null)
            return;

> new coordinator does not support v0-v2 TxnOffsetCommitRequest when using 
> CONSUMER group
> ---------------------------------------------------------------------------------------
>
>                 Key: KAFKA-18060
>                 URL: https://issues.apache.org/jira/browse/KAFKA-18060
>             Project: Kafka
>          Issue Type: Bug
>            Reporter: Chia-Ping Tsai
>            Assignee: Chia-Ping Tsai
>            Priority: Major
>
> TxnOffsetCommitRequest versions v0-v2 do not include a member ID, causing 
> ConsumerGroup#validateOffsetCommit [0] to throw an UnknownMemberIdException. 
> This prevents the old producer from calling sendOffsetsToTransaction.
> Note that TxnOffsetCommitRequest versions v0-v2 are included in KIP-896 [1], 
> so it seems the new coordinator should support that operations
> [0] 
> https://github.com/apache/kafka/blob/trunk/group-coordinator/src/main/java/org/apache/kafka/coordinator/group/modern/consumer/ConsumerGroup.java#L517
> [1] 
> https://cwiki.apache.org/confluence/display/KAFKA/KIP-896%3A+Remove+old+client+protocol+API+versions+in+Kafka+4.0



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