Page History

InitProducerIdRequest => TransactionalId TransactionTimeoutMs ConsumerGroupId AssignedPartitions
  TransactionalId => NullableString
  TransactionTimeoutMs => Int64
  ConsumerGroupId => NullableString         // NEW
  ConsumerGroupGeneration => Int32          // NEW
  AssignedPartitions => [Topic [Partition]] // NEW
    Topic => String
    Partition => Int32

InitProducerIdResponse => ThrottleTimeMs ErrorCode ProducerId ProducerEpoch
  ThrottleTimeMs => Int64
  ErrorCode => Int16
  ProducerId => Int64
  ProducerEpoch => Int16