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Hi,
We're currently applying schema changes from WMF for a MediaWiki
upgrade. To reduce replication lag, we will first apply them to an
inactive server for each cluster, then switch users to that server and
apply them on the other one. The first part has started now, and we
will be switching in an hour or two.
During the second part, user databases will be unavailable until we
finish the changes and switch back. This may take several hours to
finish.
The exception is s2/s5, which only has one server; these clusters will
be lagged during the change.
- river.
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