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https://issues.apache.org/jira/browse/KAFKA-18060?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Chia-Ping Tsai resolved KAFKA-18060.
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Resolution: Fixed
> new coordinator does not handle TxnOffsetCommitRequest with empty member id
> 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: Kuan Po Tseng
> Priority: Blocker
> Fix For: 4.0.0
>
>
> When reviewing KAFKA-17961 and KAFKA-17964, we notice two issues:
> 1) new coordinator can't handle the TxnOffsetCommitRequest with empty member
> id, and TxnOffsetCommitRequest v0-v2 do definitely has an empty member ID
> 2) the deprecated sendOffsetsToTransaction does not use v0-v2 to send
> TxnOffsetCommitRequest with an empty member ID
> (https://github.com/apache/kafka/blob/trunk/clients/src/main/java/org/apache/kafka/common/requests/TxnOffsetCommitRequest.java#L55).
> Unfortunately, it has been released for a while. Therefore, the new
> coordinator needs to handle TxnOffsetCommitRequest with an empty member ID
> for all versions.
> ----
> 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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