The metapage upgrade should be performed under critical section.
Agree. But after close look I found that btm_version change isn't wal-logged (near line 2251 in _bt_newroot). So btm_version is not propagated to replica/backup/etc.
I believe it should be fixed.
--
Teodor Sigaev E-mail: teo...@sigaev.ru
WWW: http://www.sigaev.ru/
