It is impossible to determine what is going on without giving the configuration of the sharded collection. This is usually due to improper configuration of the shard key. Please refer to the documentation for the choice of shard key: https://docs.mongodb.com/v3.0/tutorial/choose-a-shard-key/ In addition, there is a slides on LinkedIn that is also very good: http://www .slideshare.net/daumdna/mongodb-scaling-write-performance
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Forgot to create the shard index key? Check it.
It is impossible to determine what is going on without giving the configuration of the sharded collection. This is usually due to improper configuration of the shard key.
Please refer to the documentation for the choice of shard key: https://docs.mongodb.com/v3.0/tutorial/choose-a-shard-key/
In addition, there is a slides on LinkedIn that is also very good: http://www .slideshare.net/daumdna/mongodb-scaling-write-performance