I'm one of the developers behind Axibase Time-Series Database which runs on top of HBase. ATSD is two years into development and has a built-in rule engine, for

I'm one of the developers behind Axibase Time-Series Database which runs on top of HBase. ATSD is two years into development and has a built-in rule engine, forecasting,and visualization: http://axibase.com/products/axibase-time-series-database/visualization/ http://axibase.com/products/axibase-time-series-database/vis.... The rule engine allows you to write expressions such as abs(forecast_deviation(avg())) > 2.0 to trigger url/email/command actions if sliding window average is outside of 2.0 sigmas from Holt-Winters/ARIMA forecast. The license is commercial and there's a free CE version which can be scaled vertically without any throughput constraints. Tags are supported for series as well as for entities and metrics to avoid storing long-term metadata such as location, type, category etc. along with data itself. I wouldn't be surprised if functional differences between TSDBs and historians will disappear in just a few years. Right now the historians are good at compressing repetitive data at source and on disk which makes sense given their heritage in archiving data from SCADA systems.