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During the pg_createsubscriber execution, it is possible that the required WAL is removed from the primary/publisher node due to 'max_slot_wal_keep_size'. This patch raises a WARNING during the '--dry-run' mode if the 'max_slot_wal_keep_size' is set to a non-default value on the primary/publisher node. Author: Shubham Khanna <khannashubham1197@gmail.com> Reviewed-by: Peter Smith <smithpb2250@gmail.com> Reviewed-by: Hayato Kuroda <kuroda.hayato@fujitsu.com> Reviewed-by: Vignesh C <vignesh21@gmail.com> Discussion: https://postgr.es/m/CAHv8Rj+deqsQXOMa7Tck8CBQUbsua=+4AuMVQ2=MPM0f-ZHbjA@mail.gmail.com