[#MDEV-25995] Double entries are seen while streaming a backup with Mariabackup

Error: Command: cat /backup/nfs/XXXX/XXX_3400_db164015_18-5_2021-06-13_0834456

/glide/mariadb/10.2.27/bin/mbstream: Can't create/write to file './XXX_1/sys_table.frm' (Errcode: 17 "File exists")

[00] 2021-06-14 00:28:55 /glide/mariadb/10.2.27/bin/mbstream: failed to create file.

While checking mariabackup log, found that there are two entries for streaming the same file. frm and ibd files for the sys_table were streaming twice. Also, table was in the process of rename during the same time.

[01] 2021-06-13 10:35:53 Streaming ./db_1/sys_table.ibd

[01] 2021-06-13 10:35:53         ...done

..

[01] 2021-06-13 10:40:48 Streaming ./db_1/sys_table.frm to <STDOUT>

[01] 2021-06-13 10:40:49 Streaming ./db_1/sys_table.frm to <STDOUT>

..

[00] 2021-06-13 10:40:49 DDL tracking : rename 246406 "./db_1/sys_table.ibd","./db_1/z_tmp_s1097477205h.ibd"

[00] 2021-06-13 10:40:49 DDL tracking : rename 246406 "./db_1/sys_table.ibd","./db_1/z_tmp_s1097477205h.ibd"

[00] 2021-06-13 10:40:49 DDL tracking : rename 246419 "./db_1/tmp_s1097477205h.ibd","./db_1/sys_table.ibd"

[00] 2021-06-13 10:40:49 DDL tracking : rename 246419 "./db_1/tmp_s1097477205h.ibd","./db_1/sys_table.ibd"

..

[00] 2021-06-13 10:40:50 Streaming db_1/sys_table.ren

..

[00] 2021-06-13 10:40:50 Streaming ./db_1/sys_table.ibd

[00] 2021-06-13 10:40:50         ...done

[MDEV-25995] Double entries are seen while streaming a backup with Mariabackup Created: 2021-06-23 Updated: 2022-03-02 Resolved: 2022-01-11
Status:	Closed
Project:	MariaDB Server
Component/s:	mariabackup
Affects Version/s:	10.2
Fix Version/s:	N/A

[MDEV-25995] Double entries are seen while streaming a backup with Mariabackup Created: 2021-06-23 Updated: 2022-03-02 Resolved: 2022-01-11