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| <h1 id="loading-extensions">Loading extensions</h1> |
| |
| <h2 id="loading-core-extensions">Loading core extensions</h2> |
| |
| <p>Druid bundles all <a href="../development/extensions.html#core-extensions">core extensions</a> out of the box. |
| See the <a href="../development/extensions.html#core-extensions">list of extensions</a> for your options. You |
| can load bundled extensions by adding their names to your common.runtime.properties |
| <code>druid.extensions.loadList</code> property. For example, to load the <em>postgresql-metadata-storage</em> and |
| <em>druid-hdfs-storage</em> extensions, use the configuration:</p> |
| <div class="highlight"><pre><code class="language-text" data-lang="text"><span></span>druid.extensions.loadList=["postgresql-metadata-storage", "druid-hdfs-storage"] |
| </code></pre></div> |
| <p>These extensions are located in the <code>extensions</code> directory of the distribution.</p> |
| |
| <div class="note info"> |
| Druid bundles two sets of configurations: one for the <a href="../tutorials/quickstart.html">quickstart</a> and |
| one for a <a href="../tutorials/cluster.html">clustered configuration</a>. Make sure you are updating the correct |
| common.runtime.properties for your setup. |
| </div> |
| |
| <div class="note caution"> |
| Because of licensing, the mysql-metadata-storage extension does not include the required MySQL JDBC driver. For instructions |
| on how to install this library, see the <a href="../development/extensions-core/mysql.html">MySQL extension page</a>. |
| </div> |
| |
| <h2 id="loading-community-and-third-party-extensions-contrib-extensions">Loading community and third-party extensions (contrib extensions)</h2> |
| |
| <p>You can also load community and third-party extensions not already bundled with Druid. To do this, first download the extension and |
| then install it into your <code>extensions</code> directory. You can download extensions from their distributors directly, or |
| if they are available from Maven, the included <a href="../operations/pull-deps.html">pull-deps</a> can download them for you. To use <em>pull-deps</em>, |
| specify the full Maven coordinate of the extension in the form <code>groupId:artifactId:version</code>. For example, |
| for the (hypothetical) extension <em>com.example:druid-example-extension:1.0.0</em>, run: </p> |
| <div class="highlight"><pre><code class="language-text" data-lang="text"><span></span>java \ |
| -cp "lib/*" \ |
| -Ddruid.extensions.directory="extensions" \ |
| -Ddruid.extensions.hadoopDependenciesDir="hadoop-dependencies" \ |
| org.apache.druid.cli.Main tools pull-deps \ |
| --no-default-hadoop \ |
| -c "com.example:druid-example-extension:1.0.0" |
| </code></pre></div> |
| <p>You only have to install the extension once. Then, add <code>"druid-example-extension"</code> to |
| <code>druid.extensions.loadList</code> in common.runtime.properties to instruct Druid to load the extension.</p> |
| |
| <div class="note info"> |
| Please make sure all the Extensions related configuration properties listed <a href="../configuration/index.html#extensions">here</a> are set correctly. |
| </div> |
| |
| <div class="note info"> |
| The Maven groupId for almost every <a href="../development/extensions.html#community-extensions">community extension</a> is org.apache.druid.extensions.contrib. The artifactId is the name |
| of the extension, and the version is the latest Druid stable version. |
| </div> |
| |
| <h2 id="loading-extensions-from-classpath">Loading extensions from classpath</h2> |
| |
| <p>If you add your extension jar to the classpath at runtime, Druid will also load it into the system. This mechanism is relatively easy to reason about, |
| but it also means that you have to ensure that all dependency jars on the classpath are compatible. That is, Druid makes no provisions while using |
| this method to maintain class loader isolation so you must make sure that the jars on your classpath are mutually compatible.</p> |
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