Apache Druid v0.21.0 Documentation
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Realtime Process
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2021-09-24 08:04:06
Realtime Process
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Configuration
Extensions
Logging
Configuration reference
Design
Metadata storage
ZooKeeper
Deep storage
Processes and servers
Design
Segments
Development
Creating extensions
Experimental features
Developing on Druid
JavaScript functionality
Build from source
Versioning
Getting started
Single server deployment
Docker
Introduction to Apache Druid
Quickstart
Clustered deployment
Hidden
Stats aggregator
Moving Average Query
Authentication and Authorization
Apache Druid vs Elasticsearch
Rackspace Cloud Files
Graphite Emitter
MySQL Metadata Store
InfluxDB Emitter
Timestamp Min/Max aggregators
Kafka Emitter
PostgreSQL Metadata Store
DataSketches Tuple Sketch module
Apache Avro
DataSketches extension
Globally Cached Lookups
Cached Lookup Module
Historical Process
DataSketches HLL Sketch module
Coordinator Process
Apache Druid vs Kudu
Apache Parquet Extension
Realtime Process
Peons
T-Digest Quantiles Sketch module
Basic Security
Test Stats Aggregators
Apache Druid vs SQL-on-Hadoop
Approximate Histogram aggregators
Protobuf
Apache Kafka Lookups
Simple SSLContext Provider Module
Indexing Service
HDFS
ORC Extension
StatsD Emitter
Aliyun OSS
Router Process
Google Cloud Storage
DataSketches Theta Sketch module
InfluxDB Line Protocol Parser
Kerberos
Moment Sketches for Approximate Quantiles module
Apache Cassandra
DistinctCount Aggregator
Ambari Metrics Emitter
Overlord Process
MiddleManager Process
Bloom Filter
Microsoft SQLServer
Materialized View
Apache Druid vs. Key/Value Stores (HBase/Cassandra/OpenTSDB)
Indexer Process
Druid Redis Cache
Apache Ranger Security
Select
OpenTSDB Emitter
Microsoft Azure
GCE Extensions
DataSketches Quantiles Sketch module
Apache Druid vs Redshift
Broker
Thrift
Apache Druid vs Spark
Druid pac4j based Security extension
S3-compatible
Cardinality/HyperUnique aggregators
Ingestion
Data management
Schema design tips
Data formats
Ingestion
Batch ingestion
Task reference
Troubleshooting FAQ
Hadoop-based
Native batch
Stream ingestion
Amazon Kinesis
Tranquility
Apache Kafka
Misc
Papers
Operations
Getting started with Apache Druid
Web console
Misc
dump-segment tool
reset-cluster tool
Export Metadata Tool
insert-segment-to-db tool
Content for build.sbt
pull-deps tool
Deep storage migration
Legacy Management UIs
Metadata Migration
Performance tuning
HTTP compression
High availability
Alerts
Metrics
Retaining or automatically dropping data
Working with different versions of Apache Hadoop
API reference
Basic cluster tuning
Segment Size Optimization
Rolling updates
Security
LDAP auth
Security overview
TLS support
Password providers
User authentication and authorization
Querying
Druid SQL
Native queries
Query execution
Concepts
Multi-value dimensions
Lookups
Context parameters
Datasources
Query caching
Multitenancy
Joins
Native query components
Filters
Sorting and limiting (groupBy)
Spatial filters
Granularities
Virtual columns
Having filters (groupBy)
Post-aggregations
Sorting (topN)
Expressions
String comparators
Dimensions
Aggregations
Native query types
TopN
Search
DatasourceMetadata
Timeseries
TimeBoundary
Scan
SegmentMetadata
GroupBy
Tutorials
Updating existing data
Load from Apache Hadoop
Loading files natively
Compacting segments
Writing an ingestion spec
Querying data
Roll-up
Load from Apache Kafka
Deleting data
Configuring data retention
Kerberized HDFS deep storage
Transforming input data
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