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Apache Druid v31.0 Documentation
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Hadoop tutorials

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  • Load from Apache Hadoop
  • Kerberized HDFS deep storage
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  • Apache Druid v31.0 Documentation
  • Apache Druid v30.0 Documentation
  • Apache Druid v29.0 Documentation
  • Apache Druid v28.0 Documentation
  • Apache Druid v27.0 Documentation
  • Apache Druid v26.0 Documentation
  • Apache Druid v25.0 Documentation
  • Apache Druid v24.0 Documentation
  • Apache Druid v0.23.0 Documentation
  • Apache Druid v0.22.1 Documentation
  • Apache Druid v0.22.0 Documentation
  • Apache Druid v0.21.1 Documentation
  • Apache Druid v0.21.0 Documentation
  • Apache Druid v0.20.2 Documentation
  • Apache Druid v0.20.1 Documentation
  • Apache Druid v0.20.0 Documentation
  • Apache Druid v0.19.0 Documentation
  • Apache Druid v0.18.1 Documentation
  • Apache Druid v0.18.0 Documentation
  • Apache Druid v0.17.1 Documentation
  • Introduction to Apache Druid
  • Getting started
    • Single server deployment
    • Run with Docker
    • Clustered deployment
    • Ingestion tutorials
      • Load files using SQL
      • Load from Apache Kafka
      • Aggregate data with rollup
      • Write an ingestion spec
      • Transform input data
      • Convert ingestion spec to SQL
    • Data management tutorials
      • Configure data retention
      • Append data
      • Update data
      • Compact segments
      • Deleting data
    • Querying tutorials
      • Query data
      • Get to know Query view
      • Unnesting arrays
      • Query from deep storage
      • Query for latest data
    • Theta sketches tutorial
    • JDBC connector tutorial
    • Hadoop tutorials
      • Load from Apache Hadoop
      • Kerberized HDFS deep storage
  • Design
    • Architecture
    • Services
      • Coordinator
      • Overlord
      • Broker
      • Router
      • Historical
      • Middle Manager
      • Peon
      • Indexer
    • Storage
    • Segments
    • Deep storage
    • Metadata storage
    • ZooKeeper
  • Ingestion
    • Ingestion concepts
      • Source input formats
      • Input sources
      • Schema model
      • Rollup
      • Partitioning
      • Task reference
    • SQL-based batch
      • SQL-based ingestion
      • Key concepts
      • Security
      • Examples
      • Reference
      • Known issues
    • Streaming
      • Streaming ingestion
      • Supervisor
      • Apache Kafka ingestion
      • Amazon Kinesis ingestion
    • Classic batch
      • JSON-based batch
      • Hadoop-based
    • Ingestion spec reference
    • Schema design tips
    • Concurrent append and replace
    • Troubleshooting FAQ
  • Data management
    • Data updates
    • Data deletion
    • Schema changes
    • Compaction
      • Automatic compaction
      • Manual compaction
  • Querying
    • Druid SQL
      • Overview and syntax
      • All functions
      • Tips for writing good queries
      • Query from deep storage
      • SQL data types
      • Operators
      • Scalar functions
      • Aggregation functions
      • Window functions
      • Array functions
      • Multi-value string functions
      • JSON functions
      • SQL query context
      • SQL metadata tables
      • SQL query translation
    • Native queries
    • Query processing
    • Query execution
    • Troubleshooting
    • Concepts
      • Datasources
      • Joins
      • Lookups
      • Multi-value dimensions
      • Arrays
      • Nested columns
      • Multitenancy
      • Query caching
      • Using query caching
      • Query context
    • Native query types
      • Timeseries
      • TopN
      • GroupBy
      • Scan
      • Search
      • TimeBoundary
      • SegmentMetadata
      • DatasourceMetadata
    • Native query components
      • Filters
      • Granularities
      • Dimensions
      • Aggregations
      • Post-aggregations
      • Expressions
      • Having filters (groupBy)
      • Sorting and limiting (groupBy)
      • Sorting (topN)
      • String comparators
      • Virtual columns
      • Spatial filters
  • API reference
    • HTTP APIs
      • Druid SQL
      • SQL-based ingestion
      • JSON querying
      • Tasks
      • Supervisors
      • Retention rules
      • Data management
      • Lookups
      • Service status
      • Dynamic configuration
      • Legacy metadata
    • Java APIs
      • SQL JDBC driver
  • Configuration
    • Extensions
    • Logging
  • Operations
    • Automatic compaction
    • Web console
    • Java runtime
    • Durable storage
    • Security
      • Security overview
      • User authentication and authorization
      • LDAP auth
      • Password providers
      • Dynamic Config Providers
      • TLS support
    • Performance tuning
      • Basic cluster tuning
      • Segment size optimization
      • Mixed workloads
      • HTTP compression
      • Automated metadata cleanup
    • Monitoring
      • Request logging
      • Metrics
      • Alerts
    • High availability
    • Rolling updates
    • Using rules to drop and retain data
    • Migrate from firehose
    • Working with different versions of Apache Hadoop
    • Misc
      • dump-segment tool
      • reset-cluster tool
      • insert-segment-to-db tool
      • pull-deps tool
      • Deep storage migration
      • Export Metadata Tool
      • Metadata Migration
      • Content for build.sbt
  • Development
    • Creating extensions
    • JavaScript functionality
    • Build from source
    • Versioning
    • Contribute to Druid docs
    • Experimental features
  • Release info
    • Release notes
    • Upgrade notes
    • Migration guides
      • MVDs to arrays
      • Front-coded dictionaries
      • Subquery limit
      • SQL compliant mode
  • Papers
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