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MySQL Group Replication 8.0 - how to rebuild a node?
Posted by: Robert Cross
Date: April 01, 2019 08:35AM

tl;dr version: what's the correct process for adding a new node to an existing MySQL Group Replication cluster? (scale-out)

Longer version: got a three node MGR 8.0.13 multi-primary cluster here and one node had a disk crash. Got a replacement disk, but had to start from scratch with that node. I'd assumed that doing a restore of a mysqldump backup (made with --set-gtid-purged=OFF) would've bootstrapped the server enough to switch on GROUP_REPLICATION to pull it the rest of the way, getting the post-backup data from the other two nodes in the cluster.

Attempting to restore gives a stream of errors about duplicate primary keys in the user databases before eventually crashing.

Is there a FAQ I'm missing because I'd have thought scale-out was a pretty normal requirement?

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