• Apache Druid vs Kudu
• Apache Druid vs Spark
• Authentication and Authorization
• Coordinator Process
• Indexer Process
• MiddleManager Process
• Router Process
• Approximate Histogram aggregators
• Microsoft Azure
• DataSketches HLL Sketch module
• DataSketches Theta Sketch module
• Basic Security
• Cached Lookup Module
• HDFS
• Globally Cached Lookups
• ORC Extension
• PostgreSQL Metadata Store
• S3-compatible
• Stats aggregator
• Apache Cassandra
• DistinctCount Aggregator
• Cardinality/HyperUnique aggregators
• InfluxDB Line Protocol Parser
• Kafka Emitter
• Moment Sketches for Approximate Quantiles module
• OpenTSDB Emitter
• Microsoft SQLServer
• T-Digest Quantiles Sketch module
• Realtime Process