{
  "apiKey": 28,
  "type": "request",
  "listeners": ["broker"],
  "name": "TxnOffsetCommitRequest",
  // Version 1 is the same as version 0.
  //
  // Version 2 adds the committed leader epoch.
  //
  // Version 3 adds the member.id, group.instance.id and generation.id.
  //
  // Version 4 adds support for new error code TRANSACTION_ABORTABLE (KIP-890).
  //
  // Version 5 is the same as version 4 (KIP-890). Note when TxnOffsetCommit
  // requests are used in transaction, if transaction V2 (KIP_890 part 2) is
  // enabled, the TxnOffsetCommit request will also include the function for a
  // AddOffsetsToTxn call. If V2 is disabled, the client can't use
  // TxnOffsetCommit request version higher than 4 within a transaction.
  //
  // Version 6 adds topic ID support (replacing topic names), and supports
  // GROUP_ID_NOT_FOUND and STALE_MEMBER_EPOCH error codes.
  "validVersions": "0-6",
  "flexibleVersions": "3+",
  "fields": [
    { "name": "TransactionalId", "type": "string", "versions": "0+",
      "entityType": "transactionalId",
      "about": "The ID of the transaction." },
    { "name": "GroupId", "type": "string", "versions": "0+",
      "entityType": "groupId",
      "about": "The ID of the group." },
    { "name": "ProducerId", "type": "int64", "versions": "0+",
      "entityType": "producerId",
      "about": "The current producer ID in use by the transactional ID." },
    { "name": "ProducerEpoch", "type": "int16", "versions": "0+",
      "about": "The current epoch associated with the producer ID." },
    { "name": "GenerationId", "type": "int32", "versions": "3+",
      "default": "-1",
      "about": "The generation of the consumer." },
    { "name": "MemberId", "type": "string", "versions": "3+",
      "default": "",
      "about": "The member ID assigned by the group coordinator." },
    { "name": "GroupInstanceId", "type": "string", "versions": "3+",
      "nullableVersions": "3+", "default": "null",
      "about": "The unique identifier of the consumer instance provided by end user." },
    { "name": "Topics", "type" : "[]TxnOffsetCommitRequestTopic",
      "versions": "0+",
      "about": "Each topic that we want to commit offsets for.", "fields": [
      // Updated
      { "name": "Name", "type": "string", "versions": "0-5",             
        "ignorable": true, "entityType": "topicName",                    
        "about": "The topic name." },
      // New
      { "name": "TopicId", "type": "uuid", "versions": "6+",            
        "ignorable": true,                                              
        "about": "The unique topic ID." },                              
      { "name": "Partitions",
        "type": "[]TxnOffsetCommitRequestPartition", "versions": "0+",
        "about": "The partitions inside the topic that we want to commit offsets for.",
        "fields": [
        { "name": "PartitionIndex", "type": "int32", "versions": "0+",
          "about": "The index of the partition within the topic." },
        { "name": "CommittedOffset", "type": "int64", "versions": "0+",
          "about": "The message offset to be committed." },
        { "name": "CommittedLeaderEpoch", "type": "int32", "versions": "2+",
          "default": "-1", "ignorable": true,
          "about": "The leader epoch of the last consumed record." },
        { "name": "CommittedMetadata", "type": "string", "versions": "0+",
          "nullableVersions": "0+",
          "about": "Any associated metadata the client wants to keep." }
      ]}
    ]}
  ]
}

{
  "apiKey": 28,
  "type": "response",
  "name": "TxnOffsetCommitResponse",
  // Starting in version 1, on quota violation, brokers send out responses
  // before throttling.
  //
  // Version 2 is the same as version 1.
  //
  // Version 3 adds illegal generation, fenced instance id, and unknown
  // member id errors.
  //
  // Version 4 adds support for new error code TRANSACTION_ABORTABLE
  // (KIP-890).
  //
  // Version 5 is the same with version 3 (KIP-890).
  //
  // Version 6 adds topic ID support (replacing topic names), and supports
  // GROUP_ID_NOT_FOUND, STALE_MEMBER_EPOCH, and UNKNOWN_TOPIC_ID error
  // codes.
  "validVersions": "0-6",
  "flexibleVersions": "3+",
  "fields": [
    { "name": "ThrottleTimeMs", "type": "int32", "versions": "0+",
      "about": "The duration in milliseconds for which the request was throttled due to a quota violation, or zero if the request did not violate any quota." },
    { "name": "Topics", "type": "[]TxnOffsetCommitResponseTopic",
      "versions": "0+",
      "about": "The responses for each topic.", "fields": [
      // Updated
      { "name": "Name", "type": "string", "versions": "0-5",        
        "ignorable": true, "entityType": "topicName",               
        "about": "The topic name." },
      // New
      { "name": "TopicId", "type": "uuid", "versions": "6+",        
        "ignorable": true,                                          
        "about": "The unique topic ID." },                          
      { "name": "Partitions",
        "type": "[]TxnOffsetCommitResponsePartition", "versions": "0+",
        "about": "The responses for each partition in the topic.",
        "fields": [
        { "name": "PartitionIndex", "type": "int32", "versions": "0+",
          "about": "The partition index." },
        { "name": "ErrorCode", "type": "int16", "versions": "0+",
          "about": "The error code, or 0 if there was no error." }
      ]}
    ]}
  ]
}