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AddPartitionsToTxnRequest => TransactionalId PID Epoch [Topic [Partition]]
 TransactionalId => string
 PID => int64
 Epoch => int32int16
 Topic => string
 Partition => int32

AddOffsetsToTxnRequest => TransactionalId PID Epoch ConsumerGroupID
 TransactionalId => string
 PID => int64
 Epoch => int32int16
 ConsumerGroupID => string

EndTxnRequest => TransactionalId PID Epoch Command
 TransactionalId => string
 PID => int64
 Epoch => int32int16
 Command => boolean (0 means ABORT, 1 means COMMIT)

WriteTxnMarkerRequest => PID Epoch Marker CoordinatorEpoch [Topic [Partition]]
 PID => int64
 Epoch => int32int16
 CoordinatorEpoch => int32
 Marker => int8 (0 = COMMIT, 1 = ABORT)
 Topic => string
 Partition => int32

TxnOffsetCommitRequest   => ConsumerGroupID
                           PID
                           Epoch
                           RetentionTime
                           OffsetAndMetadata
 ConsumerGroupID => string
 PID => int64
 Epoch => int32int16
 RetentionTime => int64
 OffsetAndMetadata => [TopicName [Partition Offset Metadata]]
   TopicName => string
   Partition => int32
   Offset => int64
   Metadata => string