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Reading data from mongo in a cluster



I have a 6 node cluster, and a getmongo processor which is available on all six. Now when I start this processor it will start reading data from the db and collection specified. My question is that how will this data be read. As in the same process is running on all 6 nodes of the cluster, how will data be fetched uniquely? I am not able to understand how the cluster will behave in such a case.

Also can I have one node in a cluster reading from one collection and another node reading from another collection.