From the Apache document: http://atlas.apache.org/HighAvailability.html Implementation Details of Atlas High Availability The automatic selection of an Active instance, as well as automatic failover to a new Active instance happen through a leader election algorithm. For leader election, we use the Leader Latch Recipe of Apache Curator. The Active instance is the only one which initializes, modifies or reads state in the backend stores to keep them consistent. Also, when an instance is elected as Active, it refreshes any cached information from the backend stores to get up to date. A servlet filter ensures that only the active instance services user requests. If a passive instance receives these requests, it automatically redirects them to the current active instance. Hope this clears your doubt.
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