--- layout: toc --- ## Getting Started * [Design](/docs/VERSION/design/index.html) * [What is Druid?](/docs/VERSION/design/index.html#what-is-druid) * [When should I use Druid](/docs/VERSION/design/index.html#when-to-use-druid) * [Architecture](/docs/VERSION/design/index.html#architecture) * [Datasources & Segments](/docs/VERSION/design/index.html#datasources-and-segments) * [Query processing](/docs/VERSION/design/index.html#query-processing) * [External dependencies](/docs/VERSION/design/index.html#external-dependencies) * [Ingestion overview](/docs/VERSION/ingestion/index.html) * [Quickstart](/docs/VERSION/tutorials/index.html) * [Tutorial: Loading a file](/docs/VERSION/tutorials/tutorial-batch.html) * [Tutorial: Loading stream data from Kafka](/docs/VERSION/tutorials/tutorial-kafka.html) * [Tutorial: Loading a file using Hadoop](/docs/VERSION/tutorials/tutorial-batch-hadoop.html) * [Tutorial: Loading stream data using HTTP push](/docs/VERSION/tutorials/tutorial-tranquility.html) * [Tutorial: Querying data](/docs/VERSION/tutorials/tutorial-query.html) * Further tutorials * [Tutorial: Rollup](/docs/VERSION/tutorials/tutorial-rollup.html) * [Tutorial: Configuring retention](/docs/VERSION/tutorials/tutorial-retention.html) * [Tutorial: Updating existing data](/docs/VERSION/tutorials/tutorial-update-data.html) * [Tutorial: Compacting segments](/docs/VERSION/tutorials/tutorial-compaction.html) * [Tutorial: Deleting data](/docs/VERSION/tutorials/tutorial-delete-data.html) * [Tutorial: Writing your own ingestion specs](/docs/VERSION/tutorials/tutorial-ingestion-spec.html) * [Tutorial: Transforming input data](/docs/VERSION/tutorials/tutorial-transform-spec.html) * [Clustering](/docs/VERSION/tutorials/cluster.html) ## Data Ingestion * [Ingestion overview](/docs/VERSION/ingestion/index.html) * [Schema Design](/docs/VERSION/ingestion/schema-design.html) * [Data Formats](/docs/VERSION/ingestion/data-formats.html) * [Tasks Overview](/docs/VERSION/ingestion/tasks.html) * [Ingestion Spec](/docs/VERSION/ingestion/ingestion-spec.html) * [Transform Specs](/docs/VERSION/ingestion/transform-spec.html) * [Firehoses](/docs/VERSION/ingestion/firehose.html) * [Schema Changes](/docs/VERSION/ingestion/schema-changes.html) * [Batch File Ingestion](/docs/VERSION/ingestion/batch-ingestion.html) * [Native Batch Ingestion](/docs/VERSION/ingestion/native_tasks.html) * [Hadoop Batch Ingestion](/docs/VERSION/ingestion/hadoop.html) * [Stream Ingestion](/docs/VERSION/ingestion/stream-ingestion.html) * [Kafka Indexing Service (Stream Pull)](/docs/VERSION/development/extensions-core/kafka-ingestion.html) * [Stream Push](/docs/VERSION/ingestion/stream-push.html) * [Compaction](/docs/VERSION/ingestion/compaction.html) * [Updating Existing Data](/docs/VERSION/ingestion/update-existing-data.html) * [Deleting Data](/docs/VERSION/ingestion/delete-data.html) * [Task Locking & Priority](/docs/VERSION/ingestion/locking-and-priority.html) * [Task Reports](/docs/VERSION/ingestion/reports.html) * [FAQ](/docs/VERSION/ingestion/faq.html) * [Misc. Tasks](/docs/VERSION/ingestion/misc-tasks.html) ## Querying * [Overview](/docs/VERSION/querying/querying.html) * [Timeseries](/docs/VERSION/querying/timeseriesquery.html) * [TopN](/docs/VERSION/querying/topnquery.html) * [GroupBy](/docs/VERSION/querying/groupbyquery.html) * [Time Boundary](/docs/VERSION/querying/timeboundaryquery.html) * [Segment Metadata](/docs/VERSION/querying/segmentmetadataquery.html) * [DataSource Metadata](/docs/VERSION/querying/datasourcemetadataquery.html) * [Search](/docs/VERSION/querying/searchquery.html) * [Select](/docs/VERSION/querying/select-query.html) * [Scan](/docs/VERSION/querying/scan-query.html) * Components * [Datasources](/docs/VERSION/querying/datasource.html) * [Filters](/docs/VERSION/querying/filters.html) * [Aggregations](/docs/VERSION/querying/aggregations.html) * [Post Aggregations](/docs/VERSION/querying/post-aggregations.html) * [Granularities](/docs/VERSION/querying/granularities.html) * [DimensionSpecs](/docs/VERSION/querying/dimensionspecs.html) * [Context](/docs/VERSION/querying/query-context.html) * [Multi-value dimensions](/docs/VERSION/querying/multi-value-dimensions.html) * [SQL](/docs/VERSION/querying/sql.html) * [Lookups](/docs/VERSION/querying/lookups.html) * [Joins](/docs/VERSION/querying/joins.html) * [Multitenancy](/docs/VERSION/querying/multitenancy.html) * [Caching](/docs/VERSION/querying/caching.html) * [Sorting Orders](/docs/VERSION/querying/sorting-orders.html) * [Virtual Columns](/docs/VERSION/querying/virtual-columns.html) ## Design * [Overview](/docs/VERSION/design/index.html) * Storage * [Segments](/docs/VERSION/design/segments.html) * [Processes and Servers](/docs/VERSION/design/processes.html) * [Coordinator](/docs/VERSION/design/coordinator.html) * [Overlord](/docs/VERSION/design/overlord.html) * [Broker](/docs/VERSION/design/broker.html) * [Historical](/docs/VERSION/design/historical.html) * [MiddleManager](/docs/VERSION/design/middlemanager.html) * [Peons](/docs/VERSION/design/peons.html) * [Realtime (Deprecated)](/docs/VERSION/design/realtime.html) * Dependencies * [Deep Storage](/docs/VERSION/dependencies/deep-storage.html) * [Metadata Storage](/docs/VERSION/dependencies/metadata-storage.html) * [ZooKeeper](/docs/VERSION/dependencies/zookeeper.html) ## Operations * [API Reference](/docs/VERSION/operations/api-reference.html) * [Coordinator](/docs/VERSION/operations/api-reference.html#coordinator) * [Overlord](/docs/VERSION/operations/api-reference.html#overlord) * [MiddleManager](/docs/VERSION/operations/api-reference.html#middlemanager) * [Peon](/docs/VERSION/operations/api-reference.html#peon) * [Broker](/docs/VERSION/operations/api-reference.html#broker) * [Historical](/docs/VERSION/operations/api-reference.html#historical) * [Including Extensions](/docs/VERSION/operations/including-extensions.html) * [Data Retention](/docs/VERSION/operations/rule-configuration.html) * [Metrics and Monitoring](/docs/VERSION/operations/metrics.html) * [Alerts](/docs/VERSION/operations/alerts.html) * [Updating the Cluster](/docs/VERSION/operations/rolling-updates.html) * [Different Hadoop Versions](/docs/VERSION/operations/other-hadoop.html) * [Performance FAQ](/docs/VERSION/operations/performance-faq.html) * [Dump Segment Tool](/docs/VERSION/operations/dump-segment.html) * [Insert Segment Tool](/docs/VERSION/operations/insert-segment-to-db.html) * [Pull Dependencies Tool](/docs/VERSION/operations/pull-deps.html) * [Recommendations](/docs/VERSION/operations/recommendations.html) * [TLS Support](/docs/VERSION/operations/tls-support.html) * [Password Provider](/docs/VERSION/operations/password-provider.html) ## Configuration * [Configuration Reference](/docs/VERSION/configuration/index.html) * [Recommended Configuration File Organization](/docs/VERSION/configuration/index.html#recommended-configuration-file-organization) * [JVM Configuration Best Practices](/docs/VERSION/configuration/index.html#jvm-configuration-best-practices) * [Common Configuration](/docs/VERSION/configuration/index.html#common-configurations) * [Coordinator](/docs/VERSION/configuration/index.html#coordinator) * [Overlord](/docs/VERSION/configuration/index.html#overlord) * [MiddleManager & Peons](/docs/VERSION/configuration/index.html#middle-manager-and-peons) * [Broker](/docs/VERSION/configuration/index.html#broker) * [Historical](/docs/VERSION/configuration/index.html#historical) * [Caching](/docs/VERSION/configuration/index.html#cache-configuration) * [General Query Configuration](/docs/VERSION/configuration/index.html#general-query-configuration) * [Configuring Logging](/docs/VERSION/configuration/logging.html) ## Development * [Overview](/docs/VERSION/development/overview.html) * [Libraries](/docs/VERSION/development/libraries.html) * [Extensions](/docs/VERSION/development/extensions.html) * [JavaScript](/docs/VERSION/development/javascript.html) * [Build From Source](/docs/VERSION/development/build.html) * [Versioning](/docs/VERSION/development/versioning.html) * [Integration](/docs/VERSION/development/integrating-druid-with-other-technologies.html) * Experimental Features * [Overview](/docs/VERSION/development/experimental.html) * [Approximate Histograms and Quantiles](/docs/VERSION/development/extensions-core/approximate-histograms.html) * [Datasketches](/docs/VERSION/development/extensions-core/datasketches-extension.html) * [Geographic Queries](/docs/VERSION/development/geo.html) * [Router](/docs/VERSION/development/router.html) * [Kafka Indexing Service](/docs/VERSION/development/extensions-core/kafka-ingestion.html) ## Misc * [Druid Expressions Language](/docs/VERSION/misc/math-expr.html) * [Papers & Talks](/docs/VERSION/misc/papers-and-talks.html) * [Thanks](/thanks.html)