October 2017
Intermediate to advanced
226 pages
6h 56m
English
Content preview from MongoDB Administrator's Guide
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The mongos query router
MongoDB's mongos server acts as an interface between the application and the sharded cluster. First, it gathers information (metadata) about the sharded cluster from the config server (described later). Once it has the relevant information about the sharded cluster, it acts as a proxy for all the read and write operations on the cluster. In that, applications only talk to the mongos server and never talks directly to a shard.
More information on how mongos routes queries can be seen at: https://docs.mongodb.com/manual/core/sharded-cluster-query-router/.
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