Hinting aggregation or mapreduce operations?

[Esteban Feldman]

Hi all.

I'm performance tunning my application and found that some aggregation and mr operations take long time. So I try to .explain() the query for those operations and found that mongo doesn't choose wisely, if I hint at it it will be lot faster than the original (in 1 query from 16700ms to 29ms).

So my question is if there is a way to give hint to aggregation and or MR operations?

Thanks

[Dwight Merriman]

i think you can use $hint in your query expression you are doing with agg framework and/or MR.  maybe.

[Dwight Merriman]

sorry that doesn't work

nevermind

this is a future feature we need to add

what is the query that requires a hint?

[Esteban Feldman]

Dwight: 

see this tkt https://jira.mongodb.org/browse/SERVER-7579

I have many pipelines that could use some hinting in the pipeline itself.

thanks