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Setup automatic failover for misc database servers
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Description

Probably consistency is not a huge issue for non-core databases; HA is more important. It can also serve as a production test for a future HA solution for mediawiki (T119626)

3 main problems:

  • Automatic proxy failover, dbproxy1* (several options)
  • How to handle long-running connections from many services
  • Do we want to flip the read_only automatically? how?