[Toolserver-l] Schema changes, now

[River Tarnell]

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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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