An update: The first MariaDB 10 instance replicating all shards will be ready shortly, after it finishes importing wikis and the seven replication channels catch up. The tentative switch-over time is around 2014-07-24 02:00:00 UTC.
We plan to switch s2, s4, and s5 first.which are on the same backend host, labsdb1002. This will involve: 1. Downtime ~30m, during which tool connections may fail for these host names: bgwiki.labsdb bgwiktionary.labsdb cswiki.labsdb commonswiki.labsdb dewiki.labsdb enwikiquote.labsdb enwiktionary.labsdb eowiki.labsdb fiwiki.labsdb idwiki.labsdb itwiki.labsdb nlwiki.labsdb nowiki.labsdb plwiki.labsdb ptwiki.labsdb svwiki.labsdb thwiki.labsdb trwiki.labsdb wikidatawiki.labsdb zhwiki.labsdb 2. Several hours of read-only access to upstream wikis for those host names, while labs user data is migrated across. We have to impose this for data consistency. 3. Several more hours during which slow traffic may be throttled or killed, while caches warm up and we verify that the whole plan was, in fact, sane. BR Sean
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