OpenTSDB is a open-source time series database built on top of HBase. Thanks to HBase, OpenTSDB scales very nicely to accommodate large amounts of data in terms of bytes or data points -- at Pepperdata we ingest hundreds of billions of data points per day. Where OpenTSDB struggles to scale is in the number of distinct time series. Pepperdata stores time series data on all the hardware and processes across many Hadoop clusters: billions of discrete series per day. Speaker, Simon King, will discuss some of OpenTSDB's strengths and weaknesses, and some of the techniques Pepperdata uses to work around its limitations. Originally presented at Galvanize in San Francisco on 8/21/17.