Core Platform Team/Initiative/Serve read requests from multiple datacenters/Epics, User Stories, and Requirements


 * Replace all the DB slaves in codfw (need new hardware to support traffic)
 * Update and/or replace GTID_Wait / heartbeat
 * Decide where to move mainstash data (non-session data in Redis)
 * Migrate mainstash data to new location
 * Decide what is the acceptable replication lag for MediaWiki?
 * Current lag is 10-15 seconds. ~1 second would be acceptable for 90% of reads get what they need, last 10% needs reengineering
 * Evaluate lag for codfw, if not acceptable, then engineer a solution
 * Update MediaWiki code to wait for replication (if needed)
 * TLS Proxy work
 * Separate traffic on varnish level
 * Serve thumbnails