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Active & passive replication

 
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What's meant by active replication & passive replication?
 
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Originally posted by Laxmi:
What's meant by active replication & passive replication?



Active Replication : each replica is identical to the main service and attempts to service each request.
An interceptor is used to block extra responses. [ Hot Backups]

Passive Replication : the primary service handles all requests. The state of the replicas is periodically synchronized.
In the event that the primary service fails, one of the replicas takes over after its state is
synchronized [Warm Backups].
 
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In addition to madhav's response,
Both are fault tolerance techniques.
 
Consider Paul's rocket mass heater.
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