Not sure if your Java comment is warranted, a lot of Apache projects are either written in Java or run on JVM. Yes, HBase&#x27;s memstore can be optimized, in particular for small key values, but that doesn&#x27;t negate a need for time-series databases with proven scaling. HDFS offers that. How you were planning to design your tables in PostreSQL if you have 1m+ unique series inserting at 100K+&#x2F;sec. Assuming you use timestamp as a PK does it translate into 1m+ tables?