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Multiple non-exclusive backups are able to be run conrrently in different sessions. But, in the same session, only one non-exclusive backup can be run at the same moment. If pg_backup_start (pg_start_backup in v14 or before) is called in the middle of another non-exclusive backup in the same session, an error is thrown. However, previously, in logical replication walsender mode, even if that walsender session had already called pg_backup_start and started a non-exclusive backup, it could execute BASE_BACKUP command and start another non-exclusive backup. Which caused subsequent pg_backup_stop to throw an error because BASE_BACKUP unexpectedly reset the session state marked by pg_backup_start. This commit prevents BASE_BACKUP command in the middle of another non-exclusive backup in the same session. Back-patch to all supported branches. Author: Fujii Masao Reviewed-by: Kyotaro Horiguchi, Masahiko Sawada, Michael Paquier, Robert Haas Discussion: https://postgr.es/m/3374718f-9fbf-a950-6d66-d973e027f44c@oss.nttdata.com |
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