benwtrent commented on issue #15904:
URL: https://github.com/apache/lucene/issues/15904#issuecomment-4169121625

   Is the only reason we need random writing because of the back links? 
   
   
   If we searched all segment graphs (and thus compared against all nodes) 
instead of just the new one, we could remove the need for back linking and 
possibly just write the graph as it's built.
   
   I suppose it would be a different temporary file for each layer? And then at 
the end, consolidate and compress.


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