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I wondered if anyone has successfully upgraded percona 5.7 to 8.0 with a fully populated database. All the articles I've read suggest it is possible but I've tried twice in a test environment and whilst the upgrade happens, it stalls during the service start and never really gives a true indication why.

It's a large multi database server with over 100dbs at over 150gb.

I'd like to get the process nailed because when it comes to live, the servers are in a replication cluster. I've read to start with the slaves first which is fine, but even that suggests I should be able to upgrade with data.

When checking the tables are okay for upgrade they all return OK.

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