Managing chunks

By now, you should be familiar with the notion of chunks in a MongoDB sharded cluster. In this recipe, we will look at how to split chunks and migrate them across shards.

Getting ready

Ensure you have a sharded cluster ready. If you are reusing the setup from the previous recipe, ensure that you drop the database, as such:

use myShardedDB
db.dropDatabase()

Before we import the mock data, enable sharding:

sh.enableSharding('myShardedDB')
 sh.shardCollection('myShardedDB.users', {age: 1})

Finally, we need to import the mock data using the mongoimport utility:

mongoimport -h 192.168.200.200 --type csv --headerline -d myShardedDB -c users chapter_5_mock_data.csv

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