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Really enjoyed your post. I had a question about your usage of ProxySQL.

1) Do you have to update the ProxySQL configuration on your application servers when you do a slave promotion or is that handled automatically?

2) I didn't fully understand how you know which database host has a shard (i.e. shard 22). Is that also part of your ProxySQL configuration?

1) We actually keep the "state" for slave/master in EC2 tags, which are changed via a different mechanism.

2) There's a different configuration for mapping which database hosts exist on which shard. Our system currently has multiple database shards per machine, and that's stored in a configuration that our automation will update when new machines/shards go into production.

This was a fantastic post and might save me a lot of headaches in the near future. Thanks for sharing what you learned!

Right place for an off-topic feature request? :) I introduced Nylas to a few of my coworkers and one brought up something he felt was lacking: the ability to 'mark all as read.'

Working on it! https://github.com/nylas/N1/issues/886