code: public SegmentKelp createSegment(int length,
                                     byte []tableKey,
                                     long sequence)
    {
      SegmentMeta segmentMeta = findSegmentMeta(length);
      
      SegmentKelp segment;
    
      SegmentExtent extent = segmentMeta.allocate();
      
      if (extent == null) {
        extent = allocateSegment(segmentMeta);
      }
      
      segment = new SegmentKelp(extent, sequence, tableKey, this);
      segment.writing();
      
      segmentMeta.addLoaded(segment);
    
      return segment;
    }
docs: Create a new writing sequence with the given sequence id.