Sharding: mongos

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Sharding: How does it work?

Sharding: config server

• Acts just like a mongod towards clients
• You can have as many as you want
• Lightweight, so can run on the web servers
• Caches meta-data from config servers
• Routes queries to the correct shards:

• Insertions directly to one shard
• Queries to one, a few, or all shards