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Failover is the ability of a router DSA to continue to service queries even when a data DSA becomes unavailable. If the router detects that a DSA has failed, it resends outstanding requests to another DSA that serves the same partition, making the failure invisible to clients.
During normal operation, the standby DSA is kept synchronized with the primary data DSA in case it is needed.
Failover is important for systems requiring high availability and reliability.
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