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class="navGroups"><div class="navGroup"><h3 class="navGroupCategoryTitle collapsible">Getting started<span class="arrow"><svg width="24" height="24" viewBox="0 0 24 24"><path fill="#565656" d="M7.41 15.41L12 10.83l4.59 4.58L18 14l-6-6-6 6z"></path><path d="M0 0h24v24H0z" fill="none"></path></svg></span></h3><ul class="hide"><li class="navListItem"><a class="navItem" href="/docs/24.0.1/design/index.html">Introduction to Apache Druid</a></li><li class="navListItem"><a class="navItem" href="/docs/24.0.1/tutorials/index.html">Quickstart (local)</a></li><li class="navListItem"><a class="navItem" href="/docs/24.0.1/operations/single-server.html">Single server deployment</a></li><li class="navListItem"><a class="navItem" href="/docs/24.0.1/tutorials/cluster.html">Clustered deployment</a></li></ul></div><div class="navGroup"><h3 class="navGroupCategoryTitle collapsible">Tutorials<span class="arrow"><svg width="24" height="24" viewBox="0 0 24 24"><path fill="#565656" d="M7.41 15.41L12 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storage</a></li><li class="navListItem"><a class="navItem" href="/docs/24.0.1/tutorials/tutorial-msq-convert-spec.html">Convert ingestion spec to SQL</a></li></ul></div><div class="navGroup"><h3 class="navGroupCategoryTitle collapsible">Design<span class="arrow"><svg width="24" height="24" viewBox="0 0 24 24"><path fill="#565656" d="M7.41 15.41L12 10.83l4.59 4.58L18 14l-6-6-6 6z"></path><path d="M0 0h24v24H0z" fill="none"></path></svg></span></h3><ul class="hide"><li class="navListItem"><a class="navItem" href="/docs/24.0.1/design/architecture.html">Design</a></li><li class="navListItem"><a class="navItem" href="/docs/24.0.1/design/segments.html">Segments</a></li><li class="navListItem"><a class="navItem" href="/docs/24.0.1/design/processes.html">Processes and servers</a></li><li class="navListItem"><a class="navItem" href="/docs/24.0.1/dependencies/deep-storage.html">Deep storage</a></li><li class="navListItem"><a class="navItem" 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href="/docs/24.0.1/ingestion/partitioning.html">Partitioning</a></li><li class="navListItem"><a class="navItem" href="/docs/24.0.1/ingestion/ingestion-spec.html">Ingestion spec</a></li><li class="navListItem"><a class="navItem" href="/docs/24.0.1/ingestion/schema-design.html">Schema design tips</a></li><div class="navGroup subNavGroup"><h4 class="navGroupSubcategoryTitle">Stream ingestion</h4><ul><li class="navListItem"><a class="navItem" href="/docs/24.0.1/development/extensions-core/kafka-ingestion.html">Apache Kafka ingestion</a></li><li class="navListItem"><a class="navItem" href="/docs/24.0.1/development/extensions-core/kafka-supervisor-reference.html">Apache Kafka supervisor</a></li><li class="navListItem"><a class="navItem" href="/docs/24.0.1/development/extensions-core/kafka-supervisor-operations.html">Apache Kafka operations</a></li><li class="navListItem"><a class="navItem" href="/docs/24.0.1/development/extensions-core/kinesis-ingestion.html">Amazon Kinesis</a></li></ul></div><div class="navGroup subNavGroup"><h4 class="navGroupSubcategoryTitle">Batch ingestion</h4><ul><li class="navListItem"><a class="navItem" href="/docs/24.0.1/ingestion/native-batch.html">Native batch</a></li><li class="navListItem"><a class="navItem" href="/docs/24.0.1/ingestion/native-batch-input-sources.html">Native batch: input sources</a></li><li class="navListItem"><a class="navItem" href="/docs/24.0.1/ingestion/hadoop.html">Hadoop-based</a></li></ul></div><div class="navGroup subNavGroup"><h4 class="navGroupSubcategoryTitle">SQL-based ingestion 🆕</h4><ul><li class="navListItem"><a class="navItem" href="/docs/24.0.1/multi-stage-query/index.html">Overview</a></li><li class="navListItem"><a class="navItem" href="/docs/24.0.1/multi-stage-query/concepts.html">Key concepts</a></li><li class="navListItem"><a class="navItem" href="/docs/24.0.1/multi-stage-query/api.html">API</a></li><li class="navListItem"><a class="navItem" 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class="navItem" href="/docs/24.0.1/data-management/index.html">Overview</a></li><li class="navListItem"><a class="navItem" href="/docs/24.0.1/data-management/update.html">Data updates</a></li><li class="navListItem"><a class="navItem" href="/docs/24.0.1/data-management/delete.html">Data deletion</a></li><li class="navListItem"><a class="navItem" href="/docs/24.0.1/data-management/schema-changes.html">Schema changes</a></li><li class="navListItem"><a class="navItem" href="/docs/24.0.1/data-management/compaction.html">Compaction</a></li><li class="navListItem"><a class="navItem" href="/docs/24.0.1/data-management/automatic-compaction.html">Automatic compaction</a></li></ul></div><div class="navGroup"><h3 class="navGroupCategoryTitle collapsible">Querying<span class="arrow"><svg width="24" height="24" viewBox="0 0 24 24"><path fill="#565656" d="M7.41 15.41L12 10.83l4.59 4.58L18 14l-6-6-6 6z"></path><path d="M0 0h24v24H0z" fill="none"></path></svg></span></h3><ul class="hide"><div class="navGroup subNavGroup"><h4 class="navGroupSubcategoryTitle">Druid SQL</h4><ul><li class="navListItem"><a class="navItem" href="/docs/24.0.1/querying/sql.html">Overview and syntax</a></li><li class="navListItem"><a class="navItem" href="/docs/24.0.1/querying/sql-data-types.html">SQL data types</a></li><li class="navListItem"><a class="navItem" href="/docs/24.0.1/querying/sql-operators.html">Operators</a></li><li class="navListItem"><a class="navItem" href="/docs/24.0.1/querying/sql-scalar.html">Scalar functions</a></li><li class="navListItem"><a class="navItem" href="/docs/24.0.1/querying/sql-aggregations.html">Aggregation functions</a></li><li class="navListItem"><a class="navItem" href="/docs/24.0.1/querying/sql-multivalue-string-functions.html">Multi-value string functions</a></li><li class="navListItem"><a class="navItem" href="/docs/24.0.1/querying/sql-json-functions.html">JSON functions</a></li><li class="navListItem"><a class="navItem" href="/docs/24.0.1/querying/sql-functions.html">All functions</a></li><li class="navListItem"><a class="navItem" href="/docs/24.0.1/querying/sql-api.html">Druid SQL API</a></li><li class="navListItem"><a class="navItem" href="/docs/24.0.1/querying/sql-jdbc.html">JDBC driver API</a></li><li class="navListItem"><a class="navItem" href="/docs/24.0.1/querying/sql-query-context.html">SQL query context</a></li><li class="navListItem"><a class="navItem" href="/docs/24.0.1/querying/sql-metadata-tables.html">SQL metadata tables</a></li><li class="navListItem"><a class="navItem" href="/docs/24.0.1/querying/sql-translation.html">SQL query translation</a></li></ul></div><li class="navListItem"><a class="navItem" href="/docs/24.0.1/querying/querying.html">Native queries</a></li><li class="navListItem"><a class="navItem" href="/docs/24.0.1/querying/query-execution.html">Query execution</a></li><li class="navListItem"><a class="navItem" href="/docs/24.0.1/querying/troubleshooting.html">Troubleshooting</a></li><div class="navGroup subNavGroup"><h4 class="navGroupSubcategoryTitle">Concepts</h4><ul><li class="navListItem"><a class="navItem" href="/docs/24.0.1/querying/datasource.html">Datasources</a></li><li class="navListItem"><a class="navItem" href="/docs/24.0.1/querying/joins.html">Joins</a></li><li class="navListItem"><a class="navItem" href="/docs/24.0.1/querying/lookups.html">Lookups</a></li><li class="navListItem"><a class="navItem" href="/docs/24.0.1/querying/multi-value-dimensions.html">Multi-value dimensions</a></li><li class="navListItem"><a class="navItem" href="/docs/24.0.1/querying/nested-columns.html">Nested columns</a></li><li class="navListItem"><a class="navItem" href="/docs/24.0.1/querying/multitenancy.html">Multitenancy</a></li><li class="navListItem"><a class="navItem" href="/docs/24.0.1/querying/caching.html">Query caching</a></li><li class="navListItem"><a class="navItem" href="/docs/24.0.1/querying/using-caching.html">Using query caching</a></li><li class="navListItem"><a class="navItem" href="/docs/24.0.1/querying/query-context.html">Query context</a></li></ul></div><div class="navGroup subNavGroup"><h4 class="navGroupSubcategoryTitle">Native query types</h4><ul><li class="navListItem"><a class="navItem" href="/docs/24.0.1/querying/timeseriesquery.html">Timeseries</a></li><li class="navListItem"><a class="navItem" href="/docs/24.0.1/querying/topnquery.html">TopN</a></li><li class="navListItem"><a class="navItem" href="/docs/24.0.1/querying/groupbyquery.html">GroupBy</a></li><li class="navListItem"><a class="navItem" href="/docs/24.0.1/querying/scan-query.html">Scan</a></li><li class="navListItem"><a class="navItem" href="/docs/24.0.1/querying/searchquery.html">Search</a></li><li class="navListItem"><a class="navItem" href="/docs/24.0.1/querying/timeboundaryquery.html">TimeBoundary</a></li><li class="navListItem"><a class="navItem" href="/docs/24.0.1/querying/segmentmetadataquery.html">SegmentMetadata</a></li><li class="navListItem"><a class="navItem" href="/docs/24.0.1/querying/datasourcemetadataquery.html">DatasourceMetadata</a></li></ul></div><div class="navGroup subNavGroup"><h4 class="navGroupSubcategoryTitle">Native query components</h4><ul><li class="navListItem"><a class="navItem" href="/docs/24.0.1/querying/filters.html">Filters</a></li><li class="navListItem"><a class="navItem" href="/docs/24.0.1/querying/granularities.html">Granularities</a></li><li class="navListItem"><a class="navItem" href="/docs/24.0.1/querying/dimensionspecs.html">Dimensions</a></li><li class="navListItem"><a class="navItem" href="/docs/24.0.1/querying/aggregations.html">Aggregations</a></li><li class="navListItem"><a class="navItem" href="/docs/24.0.1/querying/post-aggregations.html">Post-aggregations</a></li><li class="navListItem"><a class="navItem" href="/docs/24.0.1/misc/math-expr.html">Expressions</a></li><li class="navListItem"><a class="navItem" href="/docs/24.0.1/querying/having.html">Having filters (groupBy)</a></li><li class="navListItem"><a class="navItem" href="/docs/24.0.1/querying/limitspec.html">Sorting and limiting (groupBy)</a></li><li class="navListItem"><a class="navItem" href="/docs/24.0.1/querying/topnmetricspec.html">Sorting (topN)</a></li><li class="navListItem"><a class="navItem" href="/docs/24.0.1/querying/sorting-orders.html">String comparators</a></li><li class="navListItem"><a class="navItem" href="/docs/24.0.1/querying/virtual-columns.html">Virtual columns</a></li><li class="navListItem"><a class="navItem" href="/docs/24.0.1/development/geo.html">Spatial filters</a></li></ul></div></ul></div><div class="navGroup"><h3 class="navGroupCategoryTitle collapsible">Configuration<span class="arrow"><svg width="24" height="24" viewBox="0 0 24 24"><path fill="#565656" d="M7.41 15.41L12 10.83l4.59 4.58L18 14l-6-6-6 6z"></path><path d="M0 0h24v24H0z" fill="none"></path></svg></span></h3><ul class="hide"><li class="navListItem"><a class="navItem" href="/docs/24.0.1/configuration/index.html">Configuration reference</a></li><li class="navListItem"><a class="navItem" href="/docs/24.0.1/development/extensions.html">Extensions</a></li><li class="navListItem"><a class="navItem" href="/docs/24.0.1/configuration/logging.html">Logging</a></li></ul></div><div class="navGroup"><h3 class="navGroupCategoryTitle collapsible">Operations<span class="arrow"><svg width="24" height="24" viewBox="0 0 24 24"><path fill="#565656" d="M7.41 15.41L12 10.83l4.59 4.58L18 14l-6-6-6 6z"></path><path d="M0 0h24v24H0z" fill="none"></path></svg></span></h3><ul class="hide"><li class="navListItem"><a class="navItem" href="/docs/24.0.1/operations/web-console.html">Web console</a></li><li class="navListItem"><a class="navItem" href="/docs/24.0.1/operations/java.html">Java runtime</a></li><div class="navGroup subNavGroup"><h4 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href="/docs/24.0.1/operations/basic-cluster-tuning.html">Basic cluster tuning</a></li><li class="navListItem"><a class="navItem" href="/docs/24.0.1/operations/segment-optimization.html">Segment size optimization</a></li><li class="navListItem"><a class="navItem" href="/docs/24.0.1/operations/mixed-workloads.html">Mixed workloads</a></li><li class="navListItem"><a class="navItem" href="/docs/24.0.1/operations/http-compression.html">HTTP compression</a></li><li class="navListItem"><a class="navItem" href="/docs/24.0.1/operations/clean-metadata-store.html">Automated metadata cleanup</a></li></ul></div><div class="navGroup subNavGroup"><h4 class="navGroupSubcategoryTitle">Monitoring</h4><ul><li class="navListItem"><a class="navItem" href="/docs/24.0.1/operations/request-logging.html">Request logging</a></li><li class="navListItem"><a class="navItem" href="/docs/24.0.1/operations/metrics.html">Metrics</a></li><li class="navListItem"><a class="navItem" 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href="/docs/24.0.1/operations/reset-cluster.html">reset-cluster tool</a></li><li class="navListItem"><a class="navItem" href="/docs/24.0.1/operations/insert-segment-to-db.html">insert-segment-to-db tool</a></li><li class="navListItem"><a class="navItem" href="/docs/24.0.1/operations/pull-deps.html">pull-deps tool</a></li><li class="navListItem"><a class="navItem" href="/docs/24.0.1/operations/deep-storage-migration.html">Deep storage migration</a></li><li class="navListItem"><a class="navItem" href="/docs/24.0.1/operations/export-metadata.html">Export Metadata Tool</a></li><li class="navListItem"><a class="navItem" href="/docs/24.0.1/operations/metadata-migration.html">Metadata Migration</a></li><li class="navListItem"><a class="navItem" href="/docs/24.0.1/operations/use_sbt_to_build_fat_jar.html">Content for build.sbt</a></li></ul></div></ul></div><div class="navGroup"><h3 class="navGroupCategoryTitle collapsible">Development<span class="arrow"><svg width="24" height="24" viewBox="0 0 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| <p>This page discusses how to use JavaScript to extend Apache Druid.</p> |
| <h2><a class="anchor" aria-hidden="true" id="examples"></a><a href="#examples" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Examples</h2> |
| <p>JavaScript can be used to extend Druid in a variety of ways:</p> |
| <ul> |
| <li><a href="/docs/24.0.1/querying/aggregations.html#javascript-aggregator">Aggregators</a></li> |
| <li><a href="/docs/24.0.1/querying/dimensionspecs.html#javascript-extraction-function">Extraction functions</a></li> |
| <li><a href="/docs/24.0.1/querying/filters.html#javascript-filter">Filters</a></li> |
| <li><a href="/docs/24.0.1/querying/post-aggregations.html#javascript-post-aggregator">Post-aggregators</a></li> |
| <li><a href="/docs/24.0.1/ingestion/data-formats.html#javascript-parsespec">Input parsers</a></li> |
| <li><a href="/docs/24.0.1/design/router.html#javascript">Router strategy</a></li> |
| <li><a href="/docs/24.0.1/configuration/index.html#javascript-worker-select-strategy">Worker select strategy</a></li> |
| </ul> |
| <p>JavaScript can be injected dynamically at runtime, making it convenient to rapidly prototype new functionality |
| without needing to write and deploy Druid extensions.</p> |
| <p>Druid uses the Mozilla Rhino engine at optimization level 9 to compile and execute JavaScript.</p> |
| <h2><a class="anchor" aria-hidden="true" id="security"></a><a href="#security" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Security</h2> |
| <p>Druid does not execute JavaScript functions in a sandbox, so they have full access to the machine. So JavaScript |
| functions allow users to execute arbitrary code inside druid process. So, by default, JavaScript is disabled. |
| However, on dev/staging environments or secured production environments you can enable those by setting |
| the <a href="/docs/24.0.1/configuration/index.html#javascript">configuration property</a> |
| <code>druid.javascript.enabled = true</code>.</p> |
| <h2><a class="anchor" aria-hidden="true" id="global-variables"></a><a href="#global-variables" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Global variables</h2> |
| <p>Avoid using global variables. Druid may share the global scope between multiple threads, which can lead to |
| unpredictable results if global variables are used.</p> |
| <h2><a class="anchor" aria-hidden="true" id="performance"></a><a href="#performance" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Performance</h2> |
| <p>Simple JavaScript functions typically have a slight performance penalty to native speed. More complex JavaScript |
| functions can have steeper performance penalties. Druid compiles JavaScript functions once on each data process per query.</p> |
| <p>You may need to pay special attention to garbage collection when making heavy use of JavaScript functions, especially |
| garbage collection of the compiled classes themselves. Be sure to use a garbage collector configuration that supports |
| timely collection of unused classes (this is generally easier on JDK8 with the Metaspace than it is on JDK7).</p> |
| <h2><a class="anchor" aria-hidden="true" id="javascript-vs-native-extensions"></a><a href="#javascript-vs-native-extensions" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>JavaScript vs. Native Extensions</h2> |
| <p>Generally we recommend using JavaScript when security is not an issue, and when speed of development is more important |
| than performance or memory use. If security is an issue, or if performance and memory use are of the utmost importance, |
| we recommend developing a native Druid extension.</p> |
| <p>In addition, native Druid extensions are more flexible than JavaScript functions. There are some kinds of extensions |
| (like sketches) that must be written as native Druid extensions due to their need for custom data formats.</p> |
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