Bug ID: 61982
           Summary: ApiQueryUserContributions Revision::getParentLengths
                    wrong load balancing db connection
           Product: MediaWiki
           Version: 1.23-git
          Hardware: All
                OS: All
            Status: NEW
          Severity: normal
          Priority: Unprioritized
         Component: API
       Web browser: ---
   Mobile Platform: ---

This is very similiar to Bug 59987 and may need a similar fix.

ApiQueryContributions::execute calls Revision::getParentLengths thus:

$this->parentLens = Revision::getParentLengths( $this->getDB(), $revIds );

The DB handle returned by getDB() is initialized previously to use the
'contributions' name for the database load balancer. This is appropriate for
ApiQueryContributions itself but less-so for Revision::getParentLengths as the
latter query is quite different and limits the optimization options in the back

Consider passing a second normal slave connection instead.

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