Apache Druid v26.0 Documentation
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Querying
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2023-05-28 20:57:12
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Configuration
Logging
Configuration reference
Extensions
Data management
Data updates
Compaction
Schema changes
Overview
Automatic compaction
Data deletion
Design
Processes and servers
ZooKeeper
Metadata storage
Segments
Design
Deep storage
Development
Experimental features
Build from source
Creating extensions
Versioning
Developing on Druid
JavaScript functionality
Getting started
Introduction to Apache Druid
Single server deployment
Clustered deployment
Quickstart (local)
Hidden
Ambari Metrics Emitter
HDFS
T-Digest Quantiles Sketch module
Moment Sketches for Approximate Quantiles module
Kafka Emitter
Globally Cached Lookups
Apache Druid vs Kudu
Apache Druid vs Spark
Apache Druid vs SQL-on-Hadoop
InfluxDB Line Protocol Parser
MySQL Metadata Store
Realtime Process
Simple SSLContext Provider Module
Apache Ranger Security
DistinctCount Aggregator
DataSketches Tuple Sketch module
Authentication and Authorization
Indexer Process
Kerberos
Select
Microsoft SQLServer
DataSketches HLL Sketch module
Apache Kafka Lookups
Druid pac4j based Security extension
Router Process
ORC Extension
Cardinality/HyperUnique aggregators
DataSketches Theta Sketch module
Basic Security
Druid AWS RDS Module
Apache Parquet Extension
Indexing Service
Peons
OpenTSDB Emitter
Cached Lookup Module
Approximate Histogram aggregators
Thrift
Coordinator Process
Test Stats Aggregators
MiddleManager Process
Druid Redis Cache
Apache Druid vs Elasticsearch
GCE Extensions
Native batch (simple)
Prometheus Emitter
Google Cloud Storage
Materialized View
Apache Cassandra
Stats aggregator
Kubernetes
Aliyun OSS
Overlord Process
StatsD Emitter
Apache Druid vs Redshift
InfluxDB Emitter
Rackspace Cloud Files
Protobuf
Apache Druid vs. Key/Value Stores (HBase/Cassandra/OpenTSDB)
DataSketches extension
Firehose (deprecated)
Historical Process
PostgreSQL Metadata Store
Microsoft Azure
DataSketches Quantiles Sketch module
Moving Average Query
kubernetes
Broker
Graphite Emitter
Timestamp Min/Max aggregators
Bloom Filter
S3-compatible
Apache Avro
Ingestion
Data rollup
Data model
Partitioning
Schema design tips
Data formats
Ingestion spec
Ingestion
Batch ingestion
Migrate from firehose
Hadoop-based
Native batch
Native batch: input sources
SQL-based ingestion 🆕
Security
Task reference
Overview
Examples
Troubleshooting FAQ
Reference
API
Known issues
Key concepts
Stream ingestion
Amazon Kinesis
Apache Kafka operations
Apache Kafka supervisor
Apache Kafka ingestion
Misc
Papers
Operations
Java runtime
Web console
Misc
Export Metadata Tool
Deep storage migration
pull-deps tool
reset-cluster tool
Metadata Migration
Content for build.sbt
insert-segment-to-db tool
dump-segment tool
Monitoring
Alerts
Working with different versions of Apache Hadoop
High availability
Request logging
Rolling updates
Metrics
Using rules to drop and retain data
API reference
Performance tuning
Segment size optimization
Automated metadata cleanup
Mixed workloads
HTTP compression
Basic cluster tuning
Security
Security overview
TLS support
Password providers
LDAP auth
User authentication and authorization
Dynamic Config Providers
Querying
Concepts
Nested columns
Multi-value dimensions
Query context
Query caching
Using query caching
Datasources
Joins
Lookups
Multitenancy
Druid SQL
All functions
JDBC driver API
Scalar functions
Troubleshooting
Multi-value string functions
Overview and syntax
Aggregation functions
SQL data types
Query execution
SQL query translation
JSON functions
SQL metadata tables
Native queries
Operators
SQL query context
Druid SQL API
Native query components
Virtual columns
Sorting (topN)
Dimensions
Having filters (groupBy)
Sorting and limiting (groupBy)
Aggregations
Expressions
Spatial filters
String comparators
Granularities
Filters
Post-aggregations
Native query types
Timeseries
GroupBy
TopN
Search
Scan
SegmentMetadata
DatasourceMetadata
TimeBoundary
Tutorials
Jupyter Notebook tutorials
Load files natively
Updating existing data
Docker for tutorials
Configuring data retention
Deleting data
Querying data
Transforming input data
Roll-up
Theta sketches
Load files using SQL 🆕
Load from Apache Hadoop
Get to know Query view
Compacting segments
Load from Apache Kafka
Kerberized HDFS deep storage
Convert ingestion spec to SQL
Tutorial: Run with Docker
Unnesting arrays
JDBC connector
Writing an ingestion spec
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