Apache Druid v0.20.1 Documentation
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Querying
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2021-04-05 23:01:28
Concepts
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Configuration
Extensions
Logging
Configuration reference
Design
Design
Segments
ZooKeeper
Metadata storage
Deep storage
Processes and servers
Development
Experimental features
Build from source
Versioning
Creating extensions
Developing on Druid
JavaScript functionality
Getting started
Docker
Quickstart
Introduction to Apache Druid
Single server deployment
Clustered deployment
Hidden
Rackspace Cloud Files
GCE Extensions
Druid pac4j based Security extension
Apache Ranger Security
Apache Druid vs. Key/Value Stores (HBase/Cassandra/OpenTSDB)
OpenTSDB Emitter
Apache Kafka Lookups
Graphite Emitter
StatsD Emitter
HDFS
Select
Approximate Histogram aggregators
Overlord Process
Kafka Emitter
Microsoft Azure
Bloom Filter
Moment Sketches for Approximate Quantiles module
Indexer Process
Apache Parquet Extension
Apache Druid vs Kudu
PostgreSQL Metadata Store
Apache Druid vs Redshift
Microsoft SQLServer
DataSketches extension
Simple SSLContext Provider Module
Test Stats Aggregators
Coordinator Process
Indexing Service
Apache Cassandra
Druid Redis Cache
Timestamp Min/Max aggregators
Apache Druid vs SQL-on-Hadoop
MiddleManager Process
DataSketches Theta Sketch module
T-Digest Quantiles Sketch module
Protobuf
S3-compatible
Apache Druid vs Elasticsearch
Cached Lookup Module
Ambari Metrics Emitter
Stats aggregator
Globally Cached Lookups
ORC Extension
MySQL Metadata Store
DataSketches Tuple Sketch module
Basic Security
Cardinality/HyperUnique aggregators
Broker
Router Process
Apache Druid vs Spark
Apache Avro
Moving Average Query
Google Cloud Storage
Historical Process
Realtime Process
DistinctCount Aggregator
InfluxDB Emitter
Kerberos
Authentication and Authorization
Aliyun OSS
Thrift
Materialized View
DataSketches HLL Sketch module
InfluxDB Line Protocol Parser
DataSketches Quantiles Sketch module
Peons
Ingestion
Schema design tips
Ingestion
Data management
Data formats
Batch ingestion
Hadoop-based
Task reference
Troubleshooting FAQ
Native batch
Stream ingestion
Amazon Kinesis
Tranquility
Apache Kafka
Misc
Papers
Operations
reset-cluster tool
Basic cluster tuning
Password providers
High availability
HTTP compression
Rolling updates
pull-deps tool
insert-segment-to-db tool
Alerts
Metrics
Retaining or automatically dropping data
dump-segment tool
Working with different versions of Apache Hadoop
TLS support
Getting started with Apache Druid
API reference
Web console
Misc
Segment Size Optimization
Export Metadata Tool
Deep storage migration
Legacy Management UIs
Metadata Migration
Content for build.sbt
Querying
Druid SQL
Native queries
Query execution
Concepts
Joins
Datasources
Multitenancy
Multi-value dimensions
Lookups
Context parameters
Query caching
Native query components
String comparators
Virtual columns
Aggregations
Filters
Post-aggregations
Sorting (topN)
Sorting and limiting (groupBy)
Having filters (groupBy)
Granularities
Expressions
Spatial filters
Dimensions
Native query types
Scan
TimeBoundary
Search
GroupBy
DatasourceMetadata
TopN
Timeseries
SegmentMetadata
Tutorials
Kerberized HDFS deep storage
Load from Apache Kafka
Transforming input data
Compacting segments
Configuring data retention
Load from Apache Hadoop
Deleting data
Loading files natively
Updating existing data
Writing an ingestion spec
Roll-up
Querying data
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