1572
MariaDBERRORNotableEventsHIGH confidence
Event scheduler queue modification error
Production Risk
Medium — scheduled events may not fire until the scheduler is restarted.
What this means
An internal error occurred while modifying the event scheduler queue.
Why it happens
- 1Memory allocation failure in the event scheduler.
- 2Internal concurrency issue in the event queue management.
How to reproduce
trigger — this will error
trigger — this will error
-- Typically an internal error; may surface during CREATE/ALTER EVENT under high load.
expected output
ERROR 1572 (HY000): Event scheduler: An error occurred when initializing query handler.
Fix
Restart the event scheduler
Restart the event scheduler
SET GLOBAL event_scheduler = OFF; SET GLOBAL event_scheduler = ON;
Why this works
Restarting the event scheduler reinitializes the queue and clears transient errors.
Sources
Official documentation ↗
MySQL 8.0 — 1572 ER_EVENT_MODIFY_QUEUE_ERROR
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