Only L<v2|public-inbox-v2-format(5)> repositories are supported.
+This is safe to run while normal inbox writing tools
+(L<public-inbox-mda(1)>, L<public-inbox-watch(1)>,
+L<public-inbox-learn(1)>) are active.
+
+Running this in parallel with L<public-inbox-xcpdb(1)> or
+C<"public-inbox-index --reindex"> can lead to errors or
+edited data remaining indexed.
+
+Incremental L<public-inbox-index(1)> (without C<--reindex>)
+is fine.
+
+Keep in mind this is a last resort, as it will be distruptive
+to anyone using L<git(1)> to mirror the inbox being edited.
+
=head1 CONTACT
Feedback welcome via plain-text mail to L<mailto:meta@public-inbox.org>
Only L<public-inbox-v2-format(5)> inboxes are supported.
+This is safe to run while normal inbox writing tools
+(L<public-inbox-mda(1)>, L<public-inbox-watch(1)>,
+L<public-inbox-learn(1)>) are active.
+
+Running this in parallel with L<public-inbox-xcpdb(1)> or
+C<"public-inbox-index --reindex"> can lead to errors or
+purged data remaining indexed.
+
+Incremental L<public-inbox-index(1)> (without C<--reindex>)
+is fine.
+
+Keep in mind this is a last resort, as it will be distruptive
+to anyone using L<git(1)> to mirror the inbox being purged.
+
=head1 CONTACT
Feedback welcome via plain-text mail to L<mailto:meta@public-inbox.org>
public-inbox-xcpdb is similar to L<copydatabase(1)> for
upgrading to the latest database format supported by Xapian
(e.g. "glass" or "honey"), but is designed to tolerate and
-recover from Xapian database modifications from
-L<public-inbox-watch(1)> or L<public-inbox-mda(1)>.
+accept parallel Xapian database modifications from
+L<public-inbox-watch(1)>, L<public-inbox-mda(1)>,
+L<public-inbox-learn(1)>, and L<public-inbox-index(1)>.
=head1 OPTIONS
In particular, it DOES NOT upgrade the schema used by the
PSGI search interface (see L<public-inbox-index(1)>).
+=head1 LIMITATIONS
+
+Do not use L<public-inbox-purge(1)> or L<public-inbox-edit(1)>
+while this is running; old (purged or edited data) may show up.
+
+Normal invocations L<public-inbox-index(1)> can safely run
+while this is running, too. However, reindexing via the
+L<public-inbox-index(1)/--reindex> switch will be a waste of
+computing resources.
+
=head1 CONTACT
Feedback welcome via plain-text mail to L<mailto:meta@public-inbox.org>