MongoDB Cookbook - Second Edition

Manual split and migration of chunks

Though MongoDB does a good job of splitting and migrating chunks across shards to maintain the balance, under some circumstances such as a small number of documents or relatively large number of small documents where the automatic balancer doesn't split the collection, an administrator might want to split and migrate the chunks manually. In this recipe, we will see how to split and migrate the collection manually across shards. For this recipe, we will set up a simple shard as we saw in Chapter 1, Installing and Starting the Server.

Getting ready

Refer to the recipe Starting a simple sharded environment of two shards in Chapter 1, Installing and Starting the Server to set up and start a sharded environment. It ...