Apache Druid
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Open-source columnar OLAP datastore for real-time analytics on massive datasets. Apache Druid powers interactive analytics dashboards with millisecond latency. Built-in time-series support. Automatic data rollup for aggregation. Streaming ingestion from Kafka. SQL and native query APIs. Self-healing architecture. Horizontal scalability. Data retention policies. RBAC and audit logging. Free and open source. Best for analytics on time-series data and high-velocity streams. Supports billions of events.
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