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Type:
Improvement
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Status: Open
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Priority:
Major - P3
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Resolution: Unresolved
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Affects Version/s: None
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Fix Version/s: features we're not sure of
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Component/s: Performance, Replication
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Labels:
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Environment:Any replica set environment
http://groups.google.com/group/mongodb-user/browse_thread/thread/ded206b11dd9a31f
In a nutshell, all (slave?) nodes in a replica set cache the same documents, because Mongos spreads the load across all slave nodes. This causes severe cache duplication, which leads to wasted resources (RAM) and increases IO load.