# Create 2 UNDO TABLESPACE(UNDO001(space_id =3), UNDO002(space_id =4))
CREATE TABLE t1(a varchar(60)) ENGINE INNODB;
start transaction;
INSERT INTO t1 VALUES(1);
# xtrabackup backup
# Display undo log files from target directory
undo001
undo002
# xtrabackup prepare
# Display undo log files from target directory
undo001
undo002
DROP TABLE t1;
#
#  MDEV-33980  mariadb-backup --backup is missing
#       retry logic for undo tablespaces
#
# xtrabackup backup
# Display undo log files from target directory
FOUND 5 /Retrying to read undo tablespace*/ in backup.log