msokolov commented on PR #13566:
URL: https://github.com/apache/lucene/pull/13566#issuecomment-2225970694

   This version also applies the connectedness-checking and patching to 
concurrent graph build. It was a trivial addition. I tested and it seems to 
maybe help a bit:
   
   |test       | recall | latency | index time |
   |-----------|--------|---------|------------|
   | baseline  | 0.925  | 2.29    | 172225     |
   | baseline  | 0.925  | 2.39    | 168809     |
   | candidate | 0.928  | 2.27    | 163188     |
   | candidate | 0.928  | 2.25    | 168005     |
   
   I still plan to try applying the strongly-connected graph check, so might 
want to hold off further testing until we have that. In theory it could suggest 
additional connections to add to the graph, although I suspect in practice its 
impact will be limited since what we seem to see is one big component (probably 
strongly connected?) plus a bunch of single disconnected nodes, but we'll see.


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