nicktindall commented on PR #16865:
URL: https://github.com/apache/lucene/pull/16865#issuecomment-6283319275

   Because `files()` and `fileLength` throw `IOException` it makes the 
`updateAndGet` a bit cumbersome if we want to propagate the `IOException`.
   
   We could do a `get`, `compute if -1`, `compare-and-set` but I don't think it 
changes the race semantics over the volatile read/write in any meaningful way.
   
   We could add another generation, then we'd know when the computation was 
stale, and solve the concurrent advance/compute race but we're starting to get 
into more major change territory than what I had originally intended.


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