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/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.
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.