Details
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Improvement
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Resolution: Won't Do
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Major - P3
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None
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Any replica set environment
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Replication
Description
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.