Wednesday, January 18, 2017

A MongoDB sharded cluster

A MongoDB sharded cluster consists of the following components:


shard: Each shard contains a subset of the sharded data. Each shard can be deployed as a replica set.
mongos: The mongos acts as a query router, providing an interface between client applications and the sharded cluster.
config servers: Config servers store metadata and configuration settings for the cluster. As of MongoDB 3.2, config servers can be deployed as a replica set.

Diagram of a sample sharded cluster for production purposes. Contains exactly 3 config servers, 2 or more ``mongos`` query routers, and at least 2 shards. The shards are replica sets.


Development Configuration

For testing and development, you can deploy a sharded cluster with a minimum number of components. These non-production clusters have the following components:
Diagram of a sample sharded cluster for testing/development purposes only. Contains only 1 config server, 1 ``mongos`` router, and at least 1 shard. The shard can be either a replica set or a standalone ``mongod`` instance.
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