https://bugzilla.wikimedia.org/show_bug.cgi?id=40543

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             Bug #: 40543
           Summary: Use "foreign wiki" facility to implement access to
                    wb_changes across clusters.
           Product: MediaWiki extensions
           Version: unspecified
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: Unprioritized
         Component: WikidataRepo
        AssignedTo: [email protected]
        ReportedBy: [email protected]
                CC: [email protected]
    Classification: Unclassified
   Mobile Platform: ---


Proposed solution for bug 38972:

pollForChanges should access the repo's wb_changes table using the "foreign
wiki" facility implemented by mediawiki's LBFactory_multi. This is the way
cross cluster database access is implemented for GlobalUsage, CentralAuth, etc.

(Tangent: the same mechanism could perhaps later be used to push changes to the
job queue of multiple wikis).

The implementation is simple enough, once I261a2a31 is merged, there's hardly
anything left to do. But the required setup of the load balancer is pretty
complex and needs some investigation.

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