Lets imagine I have two mongodb sharded collection: likes & comments.
Both collections are sharded, both collections have userId as a sharded key.
Lets imagine that likes collection is huge and comments collection is small. I have 10 shards in total, let's name them shard A to shard G.
Can I assume that if some particular user's likes are in shard A, then his comments will be in shard A as well?
So what I want to achieve is to have any particular user's data in the same shard. Other user's likes may be in shard C, then his comments should be in shard C as well.
Is it possibly to configure MongoDB? ( or it's the way how it's working by default? )