Hydra is a non-Hadoop database for realtime analysis of dynamic data

Hydra is not built on top of Hadoop, but functions similar to Summingbird, Storm, and Spark.

Data can stream into it, and analytics can be run in real time, rather than only in batch.

AddThis is the company that originally developed Hydra, which is now in open sourced through Apache. AddThis runs six Hydra clusters, one of which is comprised of 156 servers and processes 3.5 billion transactions per day.

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