Comment 3 for bug 1707811

I did not understand your point about master/slave switch.
This time I took backup with 2.3.9 on PS 5.6 master server with --history option:

xtrabackup --defaults-file=/home/shahriyar.rzaev/sandboxes/rsandbox_Percona-Server-5_6_36/master/my.sandbox.cnf --history --user=msandbox --password='msandbox' --target-dir=/home/shahriyar.rzaev/backup_dir/ps_5.6_master/full/2017-08-02_08-41-18 --backup --host=127.0.0.1 --port=23901 --encrypt=AES256 --encrypt-key='VVTBwgM4UhwkTTV98fhuj+D1zyWoA89K' --encrypt-threads=4 --encrypt-chunk-size=65536 --stream="xbstream" > /home/shahriyar.rzaev/backup_dir/ps_5.6_master/full/2017-08-02_08-41-18/full_backup.stream

And I did it twice:

> select count(*) from xtrabackup_history;
+----------+
| count(*) |
+----------+
| 2 |
+----------+
1 row in set (0.00 sec)

So the history is there.

Still could not reproduce.