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Adding Region; Prevent cross region failover #884
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Adding Region field in Instance, and a corresponding
regioncolumn indatabase_instancebackend table.Region is a geographic location, of higher level than DataCenter. E.g. an AWS
us-east-1is a region.The region value is supported by the following new configuration variables:
RegionPattern: a regexp to extract the region name from the hostname, if possibleDetectRegionQuery: alternatively, a query which computes the regionPreventCrossRegionMasterFailover: a failover restriction which only allows failovers within same region as failed master, or else abort promotion of a new master (similar in behavior toPreventCrossDataCenterMasterFailover)