Well, you can get where the chunks are and the ranges for the keys from the config servers directly, however I guess you've seen this already. I would think you can do this with mongosniff for each of the shards, however it's a little hacky.
However, if your queries modify data, if would suggest reading it back directly from each replica set looking for a match - this would be really easy. Once you know which shard it hit you can work out the exact chunk from the config server data.
Rainforest | +1-650-919-3216 | rainforestqa.com
On Oct 4, 2012, at 11:04 PM, Mainak Ghosh <famousmai...@gmail.com> wrote: