3655
MySQLERRORNotableReplicationHIGH confidence
Replica channel is not stopped
Production Risk
Medium — Configuration change fails; replication continues with old settings.
How to reproduce
trigger — this will error
trigger — this will error
CHANGE REPLICATION SOURCE TO SOURCE_HOST='new_host' FOR CHANNEL 'channel1'; -- channel still running
expected output
ERROR 3655 (HY000): Replication channel 'channel1' is not stopped.
Fix
Stop channel before reconfiguring
Stop channel before reconfiguring
STOP REPLICA FOR CHANNEL 'channel1'; CHANGE REPLICATION SOURCE TO SOURCE_HOST='new_host' FOR CHANNEL 'channel1'; START REPLICA FOR CHANNEL 'channel1';
Why this works
Stops the channel threads, applies the configuration change, then restarts.
What not to do
✕
Version notes
Sources
Official documentation ↗
MySQL 8.0 — 3655 ER_REPLICA_CHANNEL_NOT_STOPPED
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