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proxysql 2.5.0+ can't work with mysql 8.x backend servers #43

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sun-rui opened this issue Jul 23, 2023 · 0 comments
Open

proxysql 2.5.0+ can't work with mysql 8.x backend servers #43

sun-rui opened this issue Jul 23, 2023 · 0 comments

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@sun-rui
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sun-rui commented Jul 23, 2023

Used the proxysql plugin to configure proxysql 2.5.x with a mysql 8.x innodb cluster, but proxysql failed to connect to the backend servers:

ERROR 9001 (HY000) at line 1: Max connect timeout reached while reaching hostgroup 2 after 10000ms

Checked /var/lib/proxysql/proxysql.log and found the following message:

2023-07-22 18:34:14 MySQL_Monitor.cpp:3745:gr_report_fetching_errs(): [ERROR] Got error. mmsd 0x7f661d860000 , MYSQL 0x7f661d8d0000 , FD 40 : SELECT command denied to user 'monitor'@'mysql1' for table 'replication_group_members'

After granting the access right on performance_schema.* to the monitor user, this issue was fixed.

This issue seems related to the code change since 2.5.0 that added queries to the performance_schema.replication_group_members table, see https://github.com/sysown/proxysql/blob/v2.5.0/lib/MySQL_Monitor.cpp#L498
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