Druid is designed for fast aggregation, ingestion, and exploration of log data. Druid loads data, adds numbers, and filters data really quickly. If you are tired of waiting for your queries to return in MySQL or PostgreSQL, or if you have headaches with precomputation in Cassandra or HBase, Druid will be able to help you out. The system supports arbitrary data exploration, scales to meet your growing data volumes, and stays up in the face of different failures. Druid is used in production at a bunch of awesome companies. Check it out for yourself!