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Alexander KukushkinandGitHub
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1. All nodes with role == 'replica' and state == 'running' are are registered. In case is state isn't running the node is removed. 2. In case of failover/switchover we always first update the primary 3. When switching to a registered secondary we call citus_update_node() three times: rename primary to primary-demoted, put the primary name to a promoted secondary row and put the promoted secondary name to the primary row State transitions are produced by the transition() method. First of all the method makes sure that the actual primary is registered in the metadata. In case if for a given group the primary didn't change, the method registers new secondaries and removes secondaries that are gone. It prefers to use citus_update_node() UDF to replace gone secondaries with added. Communication protocol between primary nodes remains the same and all old features work without any changes.