https://bugzilla.wikimedia.org/show_bug.cgi?id=31052

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             Bug #: 31052
           Summary: external store database access should set mAllowLagged
                    for all but the current external store db
           Product: MediaWiki
           Version: unspecified
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: Unprioritized
         Component: Database
        AssignedTo: [email protected]
        ReportedBy: [email protected]
    Classification: Unclassified


The externalLoads array (in db.php) specifies a number of clusters that hold
external store data.  Only one of those clusters (set by
wgDefaultExternalStore) accepts writes. For all the others, they are static
read only databases, and replication lag should not matter.  When accessing
those clusters, the mAllowLagged flag should be set in the LoadBalancer class
object.

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