mgr集群下，开启增量备份开关后，查看此变量，出现连接mysql失败。

[jd-zhang]

Issue migrated from trac ticket # 610

component: kunlun-storage | priority: major

2022-04-25 18:04:17: hellen@zettadb.com created the issue

---

命令序列：
-->/home/kunlun/testmgr/instance_binaries/storage/59417/kunlun-storage-0.9.1/dba_tools
-->./imysql.sh 59417
--> SHOW GLOBAL VARIABLES LIKE '%binlog_backup_open_mode%';
-->set global binlog_backup_open_mode=on;
-->SHOW GLOBAL VARIABLES LIKE '%binlog_backup_open_mode%';
出现连接mysql失败。

mysql版本：
8.0.26-16-kunlun-storage.

备注：
norep集群也存在这样的错误，详见附件。

[jd-zhang]

2022-04-25 18:04:28: hellen@zettadb.com uploaded file 增量开关的错误.png (42.7 KiB)

[jd-zhang]

2022-04-25 18:11:17: hellen@zettadb.com uploaded file norep增量开关的错误.png (37.4 KiB)

[jd-zhang]

2022-04-25 18:12:08: hellen@zettadb.com edited the issue description