Re: pg_upgrade --copy-file-range

On Sat, Mar 23, 2024 at 9:37 AM Tomas Vondra
<tomas.vondra@enterprisedb.com> wrote:
> OK, that makes sense. Here's a patch that should work like this - in
> copy_file we check if we need to calculate checksums, and either use the
> requested copy method, or fall back to the block-by-block copy.

+        Use efficient file cloning (also known as <quote>reflinks</quote> on
+        some systems) instead of copying files to the new cluster.  This can

new cluster -> output directory

I think your version kind of messes up the debug logging. In my
version, every call to copy_file() would emit either "would copy
\"%s\" to \"%s\" using strategy %s" and "copying \"%s\" to \"%s\"
using strategy %s". In your version, the dry_run mode emits a string
similar to the former, but creates separate translatable strings for
each copy method instead of using the same one with a different value
of %s. In non-dry-run mode, I think your version loses the debug
logging altogether.

--
Robert Haas
EDB: http://www.enterprisedb.com