I’m watching the second video of chapter 5 of M201.
This video says that for sorts/limits/skips across multiple shards, the final sort/limit/skip is performed on “the primary node of the cluster”. I have a number of problems with this wording.
- In a sharded cluster, there is NO “primary shard of the cluster”. Each shard will have a primary, but there is no primary shard.
- The screenshot below from the video suggest that there is such a thing, but again I don’t think there is.
- What’s more, M103 specifically states that the final sort/limit/skip is performed on the MongoS. See M103 CH3Vid12.
Is this particular video outdated? Were “primary shards” something that existed until a few versions of Mongo ago?
@Kanika, do you know who the TA for M201 is? Who could help out with this matter?