relay_log_recovery
WARNING
Rule IDs: rp_004
Overview
- Purpose
- Documented in the MySQL 8.4 manual as a server system variable (scope: Global). Purpose and semantics are described at the linked manual page.
- Dynamic (MySQL 8.4 reference)
- MySQL 8.4 marks this variable as not dynamic (
Dynamic= No). It must be set inmy.cnfor on the command line; changing it requires a restart. - Default value
- OFF (MySQL 8.4)
- Version and product notes
- MariaDB and Percona Server may use different names, defaults, or dynamic behavior; verify their documentation.
- Documentation
- https://dev.mysql.com/doc/refman/8.4/en/replication-options-replica.html#sysvar_relay_log_recovery
- Other vendors
What is checked
Rules that reference this variable, with their severity and what each rule detects:
- WARNING
rp_004: Enable relay_log_recovery=ON for crash-safe replication on replicas.
Tuning guidance
- Recommended actions:
- Enable relay_log_recovery=ON for crash-safe replication on replicas.
- Trade-offs: Multi-threaded replication improves apply speed but requires careful configuration (LOGICAL_CLOCK, preserve_commit_order) to maintain consistency. Misconfiguration can cause data drift between source and replica.
Example
Configure in my.cnf (or equivalent) or server startup options, then restart.