code: func (m *MultiLog) GetSessionChunk(namespace string, sid session.ID, offsetBytes, maxBytes int) (data []byte, err error) {
  	for _, log := range m.loggers {
  		data, err = log.GetSessionChunk(namespace, sid, offsetBytes, maxBytes)
  		if !trace.IsNotImplemented(err) {
  			return data, err
  		}
  	}
  	return data, err
  }
docs: // GetSessionChunk returns a reader which can be used to read a byte stream
  // of a recorded session starting from 'offsetBytes' (pass 0 to start from the
  // beginning) up to maxBytes bytes.
  //
  // If maxBytes > MaxChunkBytes, it gets rounded down to MaxChunkBytes