It seems a bit out of the ordinary, but we've found ElasticSearch + facets to be wonderful ways to consume time series data. You can dump in a bunch of informat

It seems a bit out of the ordinary, but we've found ElasticSearch + facets to be wonderful ways to consume time series data. You can dump in a bunch of information about an event (for example, unix timestamp or even response time in ms) and then return a facet over the range and get bucket counts. ES also has quite nice clustering abilities that make it pretty painless to scale out. If you are clever about your routing keys you can even go crazy pre-shard hundreds of shards very early on and not have any performance hit for map reductions, but the capacity to scale out with another node without reindexing. We've been surprised at the swiss army knife like ability of ES.