rmuir commented on issue #14334:
URL: https://github.com/apache/lucene/issues/14334#issuecomment-2772221194

   Nobody needs to fsync any temporary files, ever. They are temporary: we 
don't need them durable. Look at how lucene uses  temporary files to understand 
this. 
   
   We don't need such files to persist to any storage device ever. Personally I 
use tmpfs for temp files, they only go to memory.
   
   if your operating system doesn't give you any error when using temporary 
files then your operating system is broken: get a new one. If your computer 
doesn't detect memory corruption then buy ECC memory. Lucene has checksums and 
other safeguards that might indicate it, but that's no guarantee it is just 
best-effort. IMO You read too far into a stackoverflow comment here without 
understanding how some of this works.


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