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{
  Version                => int16
  CorrelationId          => int32
  GroupId                => String
  ConsumerHost           => String
  SessionTimeout         => int32
  Topics                 => [String]
  DoesConsumerIdExist    => int16
  ConsumerId             => String 
 }

{
  Version                => int16
  CorrelationId          => int32
  ErrorCode              => int16
  GroupGenerationId      => int32
  GroupId                => String 
  ConsumerId             => String
  PartitionsToOwn        => [TopicAndPartition]
}