Apache Druid v31.0 Documentation
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API reference

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  • Data management
    • Data updates
    • Compaction
      • Automatic compaction
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    • Data deletion
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  • Configuration
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      • Druid SQL
    • Java APIs
      • SQL JDBC driver
  • Introduction to Apache Druid
  • Ingestion
    • Concurrent append and replace
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    • Ingestion concepts
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      • Known issues
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    • Ingestion spec reference
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  • Getting started
    • Single server deployment
    • JDBC connector tutorial
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      • Update data
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    • Hadoop tutorials
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      • Load from Apache Hadoop
    • Ingestion tutorials
      • Convert ingestion spec to SQL
      • Transform input data
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      • Write an ingestion spec
      • Load from Apache Kafka
      • Load files using SQL
    • Querying tutorials
      • Query for latest data
      • Get to know Query view
      • Query from deep storage
      • Unnesting arrays
      • Query data
  • Design
    • Segments
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    • Architecture
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      • Middle Manager
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    • Metadata storage
  • Development
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    • Versioning
  • Papers
  • Operations
    • High availability
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    • Web console
    • Using rules to drop and retain data
    • Durable storage
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    • Migrate from firehose
    • Working with different versions of Apache Hadoop
    • Java runtime
    • Misc
      • Metadata Migration
      • Content for build.sbt
      • insert-segment-to-db tool
      • pull-deps tool
      • reset-cluster tool
      • dump-segment tool
      • Export Metadata Tool
      • Deep storage migration
    • Monitoring
      • Metrics
      • Request logging
      • Alerts
    • Performance tuning
      • Automated metadata cleanup
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      • HTTP compression
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    • Security
      • LDAP auth
      • User authentication and authorization
      • Security overview
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      • Dynamic Config Providers
  • Querying
    • Query processing
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    • Troubleshooting
    • Native queries
    • Concepts
      • Nested columns
      • Query context
      • Arrays
      • Query caching
      • Lookups
      • Multi-value dimensions
      • Datasources
      • Using query caching
      • Joins
      • Multitenancy
    • Druid SQL
      • SQL metadata tables
      • Tips for writing good queries
      • Operators
      • Multi-value string functions
      • All functions
      • Aggregation functions
      • JSON functions
      • Query from deep storage
      • SQL query context
      • Overview and syntax
      • SQL data types
      • Scalar functions
      • SQL query translation
      • Array functions
      • Window functions
    • Native query components
      • Spatial filters
      • Aggregations
      • Post-aggregations
      • String comparators
      • Granularities
      • Sorting and limiting (groupBy)
      • Virtual columns
      • Having filters (groupBy)
      • Sorting (topN)
      • Filters
      • Expressions
      • Dimensions
    • Native query types
      • GroupBy
      • Search
      • DatasourceMetadata
      • TimeBoundary
      • SegmentMetadata
      • Scan
      • TopN
      • Timeseries
  • Release info
    • Upgrade notes
    • Release notes
    • Migration guides
      • MVDs to arrays
      • Front-coded dictionaries
      • SQL compliant mode
      • Subquery limit
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