Sharding for parallel query performance

[Mr. Flibble]

Firstly - please accept my apologies for my ignorance in this area!

I am considering the pros and cons of sharding for query performance. I read that a query such as db.people.find({"email" : "te...@domain.com"}) is sent to all of the shards in serial. 

Is this correct? Why would this query not be sent to each of the mongod servers in parallel? 

[axlfu]

http://www.mongodb.org/download/attachments/2097354/how+queries+work+with+sharding.pdf

On Apr 15, 5:30 pm, "Mr. Flibble" <conor.mccar...@gmail.com> wrote:
> Firstly - please accept my apologies for my ignorance in this area!
>
> I am considering the pros and cons of sharding for query performance. I read

> that a query such as db.people.find({"email" : "t...@domain.com"}) is sent
> to all of the shards *in serial*.

[Mr. Flibble]

Thank you but this doesn't appear to answer the question. That
document says that 'Queries not involving the shard key will be sent
to all shards as a
“scatter/gather” operation'. It doesn't comment on whether this is
done in parallel across all shard machines.

On Apr 16, 4:20 am, axlfu <freesearc...@gmail.com> wrote:
> http://www.mongodb.org/download/attachments/2097354/how+queries+work+...

[Eliot Horowitz]

Most are parallel, but a couple are still serial.
We're going to be cleaning that all up soon though:
https://jira.mongodb.org/browse/SERVER-2014

> --
> You received this message because you are subscribed to the Google Groups "mongodb-user" group.
> To post to this group, send email to mongod...@googlegroups.com.
> To unsubscribe from this group, send email to mongodb-user...@googlegroups.com.
> For more options, visit this group at http://groups.google.com/group/mongodb-user?hl=en.
>
>