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A couple of clarifications, it was probably my fault not to express them clearly when I was asked. There are about 20 English Wikipedia core mediawiki replicas (the number is not fixed, newer servers are continuously being added/upgraded and others decomissioned). There are around 130 core db server in total for all projects serving wiki traffic, to maximize high availability and performance, and its topology can be seen at: https://dbtree.wikimedia.org/ Some auxiliary (non-core) servers are hidden for clarity. Should a meteorite hit the west cost of US, we could have all wiki projects running on the secondary datacenter in 30 minutes (?)- we are trying to get faster and better there. https://blog.wikimedia.org/2016/04/11/wikimedia-failover-test/ https://www.mediawiki.org/wiki/Wikimedia_Engineering/2016-17_Q3_Goals#Technical_Operations
Also, there is 2 (not 1) db servers delayed 24 hours, one per main datacenter, one just happens to be temporarily (for a few weeks) under maintenance and it is up but not "delayed" after hardware renewal (redundancy helps, not only a recovery method, but also for easier maintenance and less user impact).
In general, backups is something that one never stops working on- there is always room for faster backups, faster recovery, more backups, better verification, more redundancy, etc.
--jynus (talk) 14:55, 6 February 2017 (UTC)[reply]
PDF rendering
I'm really excited to learn that better PDF rendering is on the way -- this will be enormously helpful to many projects. I'm curious, will the rendering respect little customizations, e.g. whether one has chosen to show or hide the Table of Contents or collapsed text, or the sort order chosen in sortable tables? Also, is there any related progress on ODT or ePub output? -Pete Forsyth (talk) 21:41, 6 February 2017 (UTC)[reply]
I too am looking forward to see the glorious PDF function restored to its glory! Can't wait for books to be a thing again! Headbomb {talk / contribs / physics / books} 17:17, 13 February 2017 (UTC)[reply]