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RecordBatch =>
  FirstOffset => int64
  Length => int32
  PartitionLeaderEpoch => int32 
  Magic => int8  
  CRC => int32
  Attributes => int16
  LastOffsetDelta => int32 
  FirstTimestamp => int64 
  MaxTimestamp => int64 
  ProducerId => int64 
  ProducerEpoch => int16 
  FirstSequence => int32 
  MessagesRecords => [MessageRecord]
 
Record => 
  Length => varint
  Attributes => int8
  TimestampDelta => varint
  OffsetDelta => varint
  KeyLen => varint
  Key => data
  ValueLen => varint
  Value => data
  Headers => [Header] 
 
Header => HeaderKey HeaderVal
  HeaderKeyLen => varint
  HeaderKey => string
  HeaderValueLen => varint
  HeaderValue => data