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MySQL Router Connect_timeout for Unstable Network Environments ( not GR / IC ) (Doc ID 2562913.1)

Last updated on OCTOBER 19, 2021

Applies to:

MySQL Router - Version 8.0 and later
Information in this document applies to any platform.
Router is not designed to work "out-of-the-box" with the existing mature , yet simple Source-Replica replication environments.
This is due to the nature of how the replication works with respect to moving their roles based on network status ( this needs to be controlled via 3rd party scripts ).

It should then be clear to see how this can lead to inconsistencies in the typical Source-Replica or even a Source-Source ( Active-Passive ) environment with Router ( without sufficient external intervention )


The app / MySQL error log is showing duplicate row errors and replication is out of sync.

Only Group Replication / InnoDB Cluster has the inbuilt controls to prevent writes to non primary node(s).


No obvious or immediate changes.

Very likely an intermittent unstable network issue.


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