We've been using Druid (http://druid.io http://druid.io) at work for just that and I think we're generally pretty happy with it. It's column-oriented though, s

We've been using Druid (http://druid.io http://druid.io) at work for just that and I think we're generally pretty happy with it. It's column-oriented though, so while it's good for metrics and aggregations, you're never really retrieve the whole JSON objects that you put into it.