Apache Druid
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Getting started

  • Introduction to Apache Druid
  • Quickstart
  • Docker
  • Single server deployment
  • Clustered deployment

Tutorials

  • Loading files natively
  • Load from Apache Kafka
  • Load from Apache Hadoop
  • Querying data
  • Roll-up
  • Configuring data retention
  • Updating existing data
  • Compacting segments
  • Deleting data
  • Writing an ingestion spec
  • Transforming input data
  • Kerberized HDFS deep storage

Design

  • Design
  • Segments
  • Processes and servers
  • Deep storage
  • Metadata storage
  • ZooKeeper

Ingestion

  • Ingestion
  • Data formats
  • Schema design tips
  • Data management
  • Stream ingestion

    • Apache Kafka
    • Amazon Kinesis
    • Tranquility

    Batch ingestion

    • Native batch
    • Hadoop-based
  • Task reference
  • Troubleshooting FAQ

Querying

  • Druid SQL
  • Native queries
  • Query execution
  • Concepts

    • Datasources
    • Joins
    • Lookups
    • Multi-value dimensions
    • Multitenancy
    • Query caching
    • Context parameters

    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

Configuration

  • Configuration reference
  • Extensions
  • Logging

Operations

  • Web console
  • Getting started with Apache Druid
  • Basic cluster tuning
  • API reference
  • High availability
  • Rolling updates
  • Retaining or automatically dropping data
  • Metrics
  • Alerts
  • Working with different versions of Apache Hadoop
  • HTTP compression
  • TLS support
  • Password providers
  • dump-segment tool
  • reset-cluster tool
  • insert-segment-to-db tool
  • pull-deps tool
  • Misc

    • Legacy Management UIs
    • Deep storage migration
    • Export Metadata Tool
    • Metadata Migration
    • Segment Size Optimization
    • Content for build.sbt

Development

  • Developing on Druid
  • Creating extensions
  • JavaScript functionality
  • Build from source
  • Versioning
  • Experimental features

Misc

  • Papers

Hidden

  • Apache Druid vs Elasticsearch
  • Apache Druid vs. Key/Value Stores (HBase/Cassandra/OpenTSDB)
  • Apache Druid vs Kudu
  • Apache Druid vs Redshift
  • Apache Druid vs Spark
  • Apache Druid vs SQL-on-Hadoop
  • Authentication and Authorization
  • Broker
  • Coordinator Process
  • Historical Process
  • Indexer Process
  • Indexing Service
  • MiddleManager Process
  • Overlord Process
  • Router Process
  • Peons
  • Approximate Histogram aggregators
  • Apache Avro
  • Microsoft Azure
  • Bloom Filter
  • DataSketches extension
  • DataSketches HLL Sketch module
  • DataSketches Quantiles Sketch module
  • DataSketches Theta Sketch module
  • DataSketches Tuple Sketch module
  • Basic Security
  • Kerberos
  • Cached Lookup Module
  • Apache Ranger Security
  • Google Cloud Storage
  • HDFS
  • Apache Kafka Lookups
  • Globally Cached Lookups
  • MySQL Metadata Store
  • ORC Extension
  • Druid pac4j based Security extension
  • Apache Parquet Extension
  • PostgreSQL Metadata Store
  • Protobuf
  • S3-compatible
  • Simple SSLContext Provider Module
  • Stats aggregator
  • Test Stats Aggregators
  • Ambari Metrics Emitter
  • Apache Cassandra
  • Rackspace Cloud Files
  • DistinctCount Aggregator
  • Graphite Emitter
  • InfluxDB Line Protocol Parser
  • InfluxDB Emitter
  • Kafka Emitter
  • Materialized View
  • Moment Sketches for Approximate Quantiles module
  • Moving Average Query
  • OpenTSDB Emitter
  • Druid Redis Cache
  • Microsoft SQLServer
  • StatsD Emitter
  • T-Digest Quantiles Sketch module
  • Thrift
  • Timestamp Min/Max aggregators
  • GCE Extensions
  • Aliyun OSS
  • Cardinality/HyperUnique aggregators
  • Select
  • Realtime Process
Edit

PostgreSQL Metadata Store

To use this Apache Druid extension, make sure to include postgresql-metadata-storage as an extension.

Setting up PostgreSQL

  1. Install PostgreSQL

Use your favorite package manager to install PostgreSQL, e.g.:

  • on Ubuntu/Debian using apt apt-get install postgresql
  • on OS X, using Homebrew brew install postgresql
  1. Create a druid database and user

On the machine where PostgreSQL is installed, using an account with proper postgresql permissions:

Create a druid user, enter diurd when prompted for the password.

createuser druid -P

Create a druid database owned by the user we just created

createdb druid -O druid

Note: On Ubuntu / Debian you may have to prefix the createuser and createdb commands with sudo -u postgres in order to gain proper permissions.

  1. Configure your Druid metadata storage extension:

Add the following parameters to your Druid configuration, replacing <host> with the location (host name and port) of the database.

druid.extensions.loadList=["postgresql-metadata-storage"]
druid.metadata.storage.type=postgresql
druid.metadata.storage.connector.connectURI=jdbc:postgresql://<host>/druid
druid.metadata.storage.connector.user=druid
druid.metadata.storage.connector.password=diurd

Configuration

In most cases, the configuration options map directly to the postgres JDBC connection options.

PropertyDescriptionDefaultRequired
druid.metadata.postgres.ssl.useSSLEnables SSLfalseno
druid.metadata.postgres.ssl.sslPasswordThe Password Provider or String password for the client's key.noneno
druid.metadata.postgres.ssl.sslFactoryThe class name to use as the SSLSocketFactorynoneno
druid.metadata.postgres.ssl.sslFactoryArgAn optional argument passed to the sslFactory's constructornoneno
druid.metadata.postgres.ssl.sslModeThe sslMode. Possible values are "disable", "require", "verify-ca", "verify-full", "allow" and "prefer"noneno
druid.metadata.postgres.ssl.sslCertThe full path to the certificate file.noneno
druid.metadata.postgres.ssl.sslKeyThe full path to the key file.noneno
druid.metadata.postgres.ssl.sslRootCertThe full path to the root certificate.noneno
druid.metadata.postgres.ssl.sslHostNameVerifierThe classname of the hostname verifier.noneno
druid.metadata.postgres.ssl.sslPasswordCallbackThe classname of the SSL password provider.noneno
druid.metadata.postgres.dbTableSchemadruid meta table schemapublicno

PostgreSQL Firehose

The PostgreSQL extension provides an implementation of an SqlFirehose which can be used to ingest data into Druid from a PostgreSQL database.

{
  "type": "index_parallel",
  "spec": {
    "dataSchema": {
      "dataSource": "some_datasource",
      "parser": {
        "parseSpec": {
          "format": "timeAndDims",
          "dimensionsSpec": {
            "dimensionExclusions": [],
            "dimensions": [
              "dim1",
              "dim2",
              "dim3"
            ]
          },
          "timestampSpec": {
            "format": "auto",
            "column": "ts"
          }
        }
      },
      "metricsSpec": [],
      "granularitySpec": {
        "type": "uniform",
        "segmentGranularity": "DAY",
        "queryGranularity": {
          "type": "none"
        },
        "rollup": false,
        "intervals": null
      },
      "transformSpec": {
        "filter": null,
        "transforms": []
      }
    },
    "ioConfig": {
      "type": "index_parallel",
      "firehose": {
        "type": "sql",
        "database": {
          "type": "postgresql",
          "connectorConfig": {
            "connectURI": "jdbc:postgresql://some-rds-host.us-west-1.rds.amazonaws.com:5432/druid",
            "user": "admin",
            "password": "secret"
          }
        },
        "sqls": [
          "SELECT * FROM some_table"
        ]
      }
    },
    "tuningconfig": {
      "type": "index_parallel"
    }
  }
}
← Apache Parquet ExtensionProtobuf →
  • Setting up PostgreSQL
  • Configuration
    • PostgreSQL Firehose

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Copyright © 2019 Apache Software Foundation.
Except where otherwise noted, licensed under CC BY-SA 4.0.
Apache Druid, Druid, and the Druid logo are either registered trademarks or trademarks of The Apache Software Foundation in the United States and other countries.