Documentation

Getting Started

• Design
  • What is Druid?
  • When should I use Druid
  • Architecture
  • Datasources & Segments
  • Query processing
  • External dependencies
  • Ingestion overview
• Quickstart
  • Tutorial: Loading a file
  • Tutorial: Loading stream data from Kafka
  • Tutorial: Loading a file using Hadoop
  • Tutorial: Loading stream data using HTTP push
  • Tutorial: Querying data- Further tutorials
  • Tutorial: Rollup
  • Tutorial: Configuring retention
  • Tutorial: Updating existing data
  • Tutorial: Compacting segments
  • Tutorial: Deleting data
  • Tutorial: Writing your own ingestion specs
  • Tutorial: Transforming input data
• Clustering

Data Ingestion

• Ingestion overview
• Data Formats
• Tasks Overview
• Ingestion Spec
  • Transform Specs
  • Firehoses
• Schema Design
• Schema Changes
• Batch File Ingestion
  • Native Batch Ingestion
  • Hadoop Batch Ingestion
• Stream Ingestion
  • Kafka Indexing Service (Stream Pull)
  • Stream Push
• Compaction
• Updating Existing Data
• Deleting Data
• Task Locking & Priority
• Task Reports
• FAQ
• Misc. Tasks

Querying

• Overview
• Timeseries
• TopN
• GroupBy
• Time Boundary
• Segment Metadata
• DataSource Metadata
• Search
• Select
• Scan
• Components
  • Datasources
  • Filters
  • Aggregations
  • Post Aggregations
  • Granularities
  • DimensionSpecs
  • Context- Multi-value dimensions
• SQL
• Lookups
• Joins
• Multitenancy
• Caching
• Sorting Orders
• Virtual Columns

Design

• Overview
• Storage
  • Segments
• Node Types
  • Historical
  • Broker
  • Coordinator
  • Indexing Service
    • Overlord
    • MiddleManager
    • Peons
  • Realtime (Deprecated)
• Dependencies
  • Deep Storage
  • Metadata Storage
  • ZooKeeper

Operations

• API Reference
  • Coordinator
  • Overlord
  • MiddleManager
  • Peon
  • Broker
  • Historical
• Including Extensions
• Data Retention
• Metrics and Monitoring
• Alerts
• Updating the Cluster
• Different Hadoop Versions
• Performance FAQ
• Dump Segment Tool
• Insert Segment Tool
• Pull Dependencies Tool
• Recommendations
• TLS Support
• Password Provider

Configuration

• Configuration Reference
• Recommended Configuration File Organization
• JVM Configuration Best Practices
• Common Configuration
• Coordinator
• Overlord
• MiddleManager & Peons
• Broker
• Historical
• Caching
• General Query Configuration
• Configuring Logging

Development

• Overview
• Libraries
• Extensions
• JavaScript
• Build From Source
• Versioning
• Integration
• Experimental Features
  • Overview
  • Approximate Histograms and Quantiles
  • Datasketches
  • Geographic Queries
  • Router
  • Kafka Indexing Service

Misc

• Druid Expressions Language
• Papers & Talks
• Thanks