• Apache Druid vs Elasticsearch
• Apache Druid vs. Key/Value Stores (HBase/Cassandra/OpenTSDB)
• Apache Druid vs Kudu
• Apache Druid vs Redshift
• Apache Druid vs Spark
• Apache Druid vs SQL-on-Hadoop
• Authentication and Authorization
• Broker
• Coordinator Process
• Historical Process
• Indexer Process
• Indexing Service
• MiddleManager Process
• Overlord Process
• Router Process
• Peons
• Approximate Histogram aggregators
• Apache Avro
• Bloom Filter
• DataSketches extension
• DataSketches HLL Sketch module
• DataSketches Quantiles Sketch module
• DataSketches Theta Sketch module
• DataSketches Tuple Sketch module
• Basic Security
• Kerberos
• Cached Lookup Module
• Google Cloud Storage
• HDFS
• Apache Kafka Lookups
• Globally Cached Lookups
• MySQL Metadata Store
• ORC Extension
• Apache Parquet Extension
• PostgreSQL Metadata Store
• Protobuf
• S3-compatible
• Simple SSLContext Provider Module
• Stats aggregator
• Test Stats Aggregators
• Ambari Metrics Emitter
• Microsoft Azure
• Apache Cassandra
• Rackspace Cloud Files
• DistinctCount Aggregator
• Graphite Emitter
• Aggregations
• Datasources
• Transforming Dimension Values
• Query Filters
• Aggregation Granularity
• Filter groupBy query results
• Cardinality/HyperUnique aggregators
• Sort groupBy query results
• Post-Aggregations
• Query context
• Refining search queries
• Sorting Orders
• TopNMetricSpec
• Virtual Columns
• InfluxDB Line Protocol Parser
• InfluxDB Emitter
• Kafka Emitter
• Materialized View
• Moment Sketches for Approximate Quantiles module
• development/extensions-contrib/moving-average-query
• OpenTSDB Emitter
• Druid Redis Cache
• Microsoft SQLServer
• StatsD Emitter
• T-Digest Quantiles Sketch module
• Thrift
• Timestamp Min/Max aggregators
• Realtime Process