kou commented on PR #44977:
URL: https://github.com/apache/arrow/pull/44977#issuecomment-2530013895

   > > `closer.lua` redirects to dlcdn.apache.org or something for the latest 
release and archive.apache.org for old releases automatically.
   > 
   > If we use `closer.lua`, then downloads risk failing again when the 
`closer.lua` service is unavailable, right? The point of a CDN is to make the 
downloads reliable.
   
   Right. But I think that `closer.lua` is enough stable. I've never seen 
`closer`.lua` down.
   
   > https://dlcdn.apache.org/orc/ provides several older ORC releases, and we 
should bump to the newer version regularly anyway.
   
   It works for the latest Apache Arrow release. If a user wants to build old 
Apache Arrow, the target ORC may not exist in https://dlcdn.apache.org/orc/ . 
For example, Apache Arrow 16.0.0 uses ORC 2.0.0 
https://github.com/apache/arrow/blob/apache-arrow-16.0.0/cpp/thirdparty/versions.txt#L93
 but ORC 2.0.0 doesn't exist in https://dlcdn.apache.org/orc/ now. `closer.lua` 
always works both for ORC 2.0.3 and ORC 2.0.0.


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