https://bugzilla.wikimedia.org/show_bug.cgi?id=31170
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Bug #: 31170
Summary: centralauth needs a read-only db flag that allows
queries to go to lagged slaves
Product: MediaWiki
Version: 1.18
Platform: All
OS/Version: All
Status: NEW
Severity: major
Priority: Unprioritized
Component: Database
AssignedTo: [email protected]
ReportedBy: [email protected]
Classification: Unclassified
There doesn't currently seem to be a way to set centralauth to read-only which
results in a site outage when its master needs to be rotated.
When the cluster with centralauth is set to read-only (currently S7), it only
applies to wikis also on that cluster. Other wikis will still both want to
write to centralauth, and also only send their queries to a caught up slave,
which there won't be any of for a time during a master switch.
Normally, when a cluster has $wgReadOnly = true, queries are sent to any slave
and replication lag checking is disabled. Setting centralauth to read-only
needs this behavior as well.
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