Any experiencing errors upgrading to 4.7.9, related to 'CRM-16189 Financial account relationship'
Actually I found it was the FK changes in 4_7_8 in FourSeven.php in conjunction with the 4.7.8.mysql.tpl were crashing server.  By commenting out all 4.7.8.mysql.tpl and then manually running these after upgrade complete, there were no crash/hang.