db.eval() in sharded enviroment

[Voltron]

I intend to use db.eval() as in the example in the documentatiion
(http://www.mongodb.org/display/DOCS/Server-Side+Processing) as I have
to calculate averages. This is contrary to statement that one should
avoid using db.eval() in a sharded environment.

What would be the preferred method then?


Thanks

[Eliot Horowitz]

This is sort of uncharted waters for us right now.

We could allow read only db.evals that hit every shard for example.

Short answer is there is no great solution. We'll be working on this
a lot over the next couple of months.

-Eliot