Replica Sets and Master-Slave are alternatives for achieving replication in MongoDb. The original implementation was Master-Slave until version 1.6 onwards which contained the Replica Set feature. From then on, Replica Set is a functional superset of the Master-Slave setup which supports asynchronous replication, automatic failover and automatic recovery of a member node. Things that master/slave didn't originally support.
It is therefore recommended that replica sets are used instead of master/slave setup to achieve replication for production environments using MongoDb.
For more info on MongoDb Replica Sets,
click here.
For more info on MongoDb Master/Slave,
click here.
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