SHOW VARIABLES LIKE 'aria_log_file_size';
Variable_name	Value
aria_log_file_size	8388608
CREATE PROCEDURE display_aria_log_control(ctrl BLOB)
BEGIN
SELECT HEX(REVERSE(SUBSTRING(ctrl, 42, 4))) AS last_logno;
END;
$$
CREATE PROCEDURE populate_t1()
BEGIN
FOR id IN 0..9 DO
INSERT INTO test.t1 (id, txt) VALUES (id, REPEAT(id,1024*1024));
END FOR;
END;
$$
CREATE TABLE test.t1(id INT, txt LONGTEXT) ENGINE=Aria;
# MYSQLD_DATADIR/aria_log_control before --backup
CALL display_aria_log_control(@aria_log_control);
last_logno
00000001
# Running --backup
# MYSQLD_DATADIR/aria_log_control after --backup
CALL display_aria_log_control(@aria_log_control);
last_logno
00000002
# targetdir/aria_log_control after --backup
CALL display_aria_log_control(@aria_log_control);
last_logno
00000001
# Running --prepare
# targetdir/aria_log_control after --prepare
CALL display_aria_log_control(@aria_log_control);
last_logno
00000002
# shutdown server
# remove datadir
# xtrabackup move back
# restart
# MYSQLD_DATADIR/aria_log_control after --copy-back
CALL display_aria_log_control(@aria_log_control);
last_logno
00000002
# Checking that after --restore all t1 data is there
SELECT id, LENGTH(txt) FROM t1 ORDER BY id;
id	LENGTH(txt)
0	1048576
1	1048576
2	1048576
3	1048576
4	1048576
5	1048576
6	1048576
7	1048576
8	1048576
9	1048576
DROP TABLE t1;
DROP PROCEDURE populate_t1;
DROP PROCEDURE display_aria_log_control;