nickva commented on code in PR #5611:
URL: https://github.com/apache/couchdb/pull/5611#discussion_r2257353592
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rel/overlay/etc/default.ini:
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@@ -120,6 +120,16 @@ view_index_dir = {{view_index_dir}}
; this setting.
;cfile_skip_ioq = false
+; CouchDB will not normally allow a database downgrade to a previous version if
+; the new version added new fields to the database file header structure. You
+; can disable this protection by setting this to false. We recommend
+; re-enabling the protection after you have performed the downgrade but it is
+; not mandatory to do so.
+; Note that some future versions of CouchDB might not support downgrade at all,
+; whatever value this is set to. In those cases CouchDB will refuse to
+; downgrade or even open the databases in question.
+;prohibit_downgrade = true
Review Comment:
I did start that way actually, the pr branch is actually named
`allow-downgrades-option`, but there was a discussion in dev to improve wording
and naming and I think we settled on having something that expresses the
default as a `true` value. I am ok either way as well, but prohibit does sound
a bit stronger and more worrisome which is a good thing in this case.
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