EC
3069
MariaDBERRORNotableReplicationHIGH confidence

FOR CHANNEL clause required for multi-source replication

Production Risk

Medium — unintended replication channels may remain running.

What this means

A replication command was issued without the required FOR CHANNEL clause on a server that has multiple replication channels configured.

Why it happens
  1. 1Using START/STOP/RESET SLAVE without FOR CHANNEL when multiple channels exist.
  2. 2Ambiguous commands that require a channel qualifier.
How to reproduce
trigger — this will error
trigger — this will error
STOP SLAVE;  -- when multiple channels are configured

expected output

ERROR 3069 (HY000): Command needs a channel for execution.

Fix 1

Specify the target channel explicitly

Specify the target channel explicitly
STOP SLAVE FOR CHANNEL 'ch1';

Why this works

Disambiguates the command for multi-source setups.

Fix 2

Stop all channels individually

Stop all channels individually
STOP SLAVE FOR CHANNEL 'ch1';
STOP SLAVE FOR CHANNEL 'ch2';

Why this works

Each channel is stopped in sequence.

What not to do

✕

Sources
Official documentation ↗

MySQL 8.0 — 3069 ER_CHANNEL_WITHOUT_CHANNEL2

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