code: @InService(SegmentServiceImpl.class)
    public
    Page writeCheckpoint(TableKelp table, 
                         OutSegment sOut,
                         long oldSequence,
                         int saveLength,
                         int tail,
                         int saveSequence)
      throws IOException
    {
      return null;
    }
docs: Called by the segment writing service to write the page to the stream.
  
  @param table
  @param sOut
  @param oldSequence
  @param saveLength
  @param tail
  @param saveSequence
  @return
  @throws IOException