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Created April 3, 2020 at 7:57 PM
Updated March 6, 2024 at 9:39 PM
Resolved April 29, 2020 at 11:51 AM
We should expand the documentation regarding upgrading from 5.7 to 8.0 .
https://www.percona.com/doc/percona-xtradb-cluster/8.0/howtos/upgrade_guide.html
Replication from 8.0 to 5.7 is not supposed to work (and it doesn't). At the moment a user tries to write on 8.0 while still has 5.7 on the cluster it will break the cluster with:
This is especially a problem since ProxySQL by default uses an internal algorithm to chose its writer. Listing the errors on a limitations page or even on the upgrade documentation will safe support a lot of tickets .