# File lib/innodb/log_group.rb, line 74
  def reader(lsn_coord = start_lsn)
    lsn_no, lsn_offset = lsn_coord
    lsn = Innodb::LSN.new(lsn_no, lsn_offset)
    Innodb::LogReader.new(lsn, self)
  end