EC
1753
MariaDBERRORNotableReplicationHIGH confidence

Multi-threaded slave feature not supported

Production Risk

High — replication halted.

What this means

A feature or combination of settings is not compatible with Multi-Threaded Slave (MTS) parallel replication.

Why it happens
  1. 1Using non-MTS-compatible features such as certain event types with slave_parallel_workers > 0.
  2. 2Combining MTS with unsupported relay log recovery modes.
How to reproduce
trigger — this will error
trigger — this will error
SET GLOBAL slave_parallel_workers = 4; -- then encounter incompatible event

expected output

ERROR 1753 (HY000): Multi-threaded slave: feature not supported.

Fix

Disable MTS or remove the incompatible feature

Disable MTS or remove the incompatible feature
STOP SLAVE;
SET GLOBAL slave_parallel_workers = 0;
START SLAVE;

Why this works

Reverts to single-threaded replication which supports all event types.

What not to do

✕

Sources
Official documentation ↗

MySQL 8.0 — 1753 ER_MTS_FEATURE_IS_NOT_SUPPORTED

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