3253
MariaDBERRORNotableReplicationHIGH confidence
Replication IO thread delay option is not supported
Production Risk
Medium — configuration change fails; replication continues with existing delay.
How to reproduce
trigger — this will error
trigger — this will error
CHANGE REPLICATION SOURCE TO SOURCE_DELAY=3600;
expected output
ERROR 3253 (HY000): This operation cannot be performed with a running replication IO thread.
Fix
Stop IO thread first
Stop IO thread first
STOP REPLICA IO_THREAD; CHANGE REPLICATION SOURCE TO SOURCE_DELAY=3600; START REPLICA IO_THREAD;
Why this works
The IO thread must be stopped before changing the delay setting.
What not to do
✕
Sources
Official documentation ↗
MySQL 8.0 — 3253 ER_REPLICATION_SLAVE_IO_THREAD_DELAY
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