this post was submitted on 05 Sep 2024
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If you have the bandwidth... it is absolutely worth it to invest in a maintenance mode for your system, just check some flat file on disk for a flag before loading up a router or anything and then, if it's engaged, just send back a static html file with ye olde "under construction" picture.
Bonus points if your static site sends a 503 with a retry after header.
That’s not really… possible at this point. We have thousands of customers (some very large ones, like A——n and G—-e and Wal___t) with tens or hundreds of millions of users, and even at lowest traffic periods do 60k+ queries per second.
This is the same MySQL instance I wrote about a while ago that hit the 16TiB table size limit (due to ext4 file system limitations) and caused a massive outage; worst I’ve been involved in during my 26 year career.
Every day I am shocked at our scale, considering my company is only like 90 engineers.