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class="search-icon" tabindex="0"></span><input type="search" id="search_input_react" placeholder="Loading..." aria-label="Search" class="navbar__search-input search-bar" disabled=""></div></div></div></div><div role="presentation" class="navbar-sidebar__backdrop"></div></nav><div id="__docusaurus_skipToContent_fallback" class="main-wrapper mainWrapper_z2l0 docsWrapper_BCFX"><button aria-label="Scroll back to top" class="clean-btn theme-back-to-top-button backToTopButton_sjWU" type="button"></button><div class="docPage__5DB"><main class="docMainContainer_gTbr docMainContainerEnhanced_Uz_u"><div class="container padding-top--md padding-bottom--lg"><div class="row"><div class="col docItemCol_VOVn"><div class="docItemContainer_Djhp"><article><div class="tocCollapsible_ETCw theme-doc-toc-mobile tocMobile_ITEo"><button type="button" class="clean-btn tocCollapsibleButton_TO0P">On this page</button></div><div class="theme-doc-markdown markdown"><header><h1>MySQL metadata store</h1></header><p>To use this Apache Druid extension, <a href="/docs/latest/configuration/extensions#loading-extensions">include</a> <code>mysql-metadata-storage</code> in the extensions load list.</p><p>With the MySQL extension, you can use MySQL as a metadata store or ingest from a MySQL database.</p><p>The extension requires a connector library that&#x27;s not included with Druid.
See the <a href="#prerequisites">Prerequisites</a> for installation instructions.</p><h2 class="anchor anchorWithStickyNavbar_LWe7" id="prerequisites">Prerequisites<a href="#prerequisites" class="hash-link" aria-label="Direct link to Prerequisites" title="Direct link to Prerequisites">​</a></h2><p>To use the MySQL extension, you need to install one of the following libraries:</p><ul><li><a href="#install-mysql-connectorj">MySQL Connector/J</a></li><li><a href="#install-mariadb-connectorj">MariaDB Connector/J</a></li></ul><h3 class="anchor anchorWithStickyNavbar_LWe7" id="install-mysql-connectorj">Install MySQL Connector/J<a href="#install-mysql-connectorj" class="hash-link" aria-label="Direct link to Install MySQL Connector/J" title="Direct link to Install MySQL Connector/J">​</a></h3><p>The MySQL extension uses Oracle&#x27;s MySQL JDBC driver.
The current version of Druid uses version 8.2.0.
Other versions may not work with this extension.</p><p>You can download the library from one of the following sources:</p><ul><li><a href="https://dev.mysql.com/downloads/connector/j/" target="_blank" rel="noopener noreferrer">MySQL website</a><br>Visit the archives page to access older product versions.</li><li><a href="https://repo1.maven.org/maven2/com/mysql/mysql-connector-j/8.2.0/mysql-connector-j-8.2.0.jar" target="_blank" rel="noopener noreferrer">Maven Central (direct download)</a></li><li>Your package manager. For example, <code>libmysql-java</code> on APT for a Debian-based OS.</li></ul><p>The download includes the MySQL connector JAR file with a name like <code>mysql-connector-j-8.2.0.jar</code>.
Copy or create a symbolic link to this file inside the <code>lib</code> folder in the distribution root directory.</p><h3 class="anchor anchorWithStickyNavbar_LWe7" id="install-mariadb-connectorj">Install MariaDB Connector/J<a href="#install-mariadb-connectorj" class="hash-link" aria-label="Direct link to Install MariaDB Connector/J" title="Direct link to Install MariaDB Connector/J">​</a></h3><p>This extension also supports using the MariaDB connector jar.
The current version of Druid uses version 2.7.3.
Other versions may not work with this extension.</p><p>You can download the library from one of the following sources:</p><ul><li><a href="https://mariadb.com/downloads/connectors/connectors-data-access/java8-connector" target="_blank" rel="noopener noreferrer">MariaDB website</a><br>Click <strong>Show All Files</strong> to access older product versions.</li><li><a href="https://repo1.maven.org/maven2/org/mariadb/jdbc/mariadb-java-client/2.7.3/mariadb-java-client-2.7.3.jar" target="_blank" rel="noopener noreferrer">Maven Central (direct download)</a></li></ul><p>The download includes the MariaDB connector JAR file with a name like <code>maria-java-client-2.7.3.jar</code>.
Copy or create a symbolic link to this file inside the <code>lib</code> folder in the distribution root directory.</p><p>To configure the <code>mysql-metadata-storage</code> extension to use the MariaDB connector library instead of MySQL, set <code>druid.metadata.mysql.driver.driverClassName=org.mariadb.jdbc.Driver</code>.</p><p>The protocol of the connection string is <code>jdbc:mysql:</code> or <code>jdbc:mariadb:</code>,
depending on your specific version of the MariaDB client library.
For more information on the parameters to configure a connection,
<a href="https://mariadb.com/kb/en/about-mariadb-connector-j/#connection-strings" target="_blank" rel="noopener noreferrer">see the MariaDB documentation</a>
for your connector version.</p><h2 class="anchor anchorWithStickyNavbar_LWe7" id="set-up-mysql">Set up MySQL<a href="#set-up-mysql" class="hash-link" aria-label="Direct link to Set up MySQL" title="Direct link to Set up MySQL">​</a></h2><p>To avoid issues with upgrades that require schema changes to a large metadata table, consider a MySQL version that supports instant ADD COLUMN semantics. For example, MySQL 8.</p><ol><li><p>Install MySQL</p><p>Use your favorite package manager to install mysql, e.g.:</p></li></ol><ul><li><p>on Ubuntu/Debian using apt <code>apt-get install mysql-server</code></p></li><li><p>on OS X, using <a href="http://brew.sh/" target="_blank" rel="noopener noreferrer">Homebrew</a> <code>brew install mysql</code></p><p>Alternatively, download and follow installation instructions for MySQL
Community Server here:
<a href="http://dev.mysql.com/downloads/mysql/" target="_blank" rel="noopener noreferrer">http://dev.mysql.com/downloads/mysql/</a>.</p></li></ul><p>This extension also supports using MariaDB server, <a href="https://mariadb.org/download/" target="_blank" rel="noopener noreferrer">https://mariadb.org/download/</a>, substituting for MariaDB in the following instructions where appropriate.</p><ol start="2"><li><p>Create a druid database and user</p><p>Connect to MySQL from the machine where it is installed.</p><div class="language-bash codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#bfc7d5;--prism-background-color:#292d3e"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-bash codeBlock_bY9V thin-scrollbar"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#bfc7d5"><span class="token plain">mysql -u root</span><br></span></code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_eSgA" aria-hidden="true"><svg viewBox="0 0 24 24" class="copyButtonIcon_y97N"><path fill="currentColor" d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg viewBox="0 0 24 24" class="copyButtonSuccessIcon_LjdS"><path fill="currentColor" d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></span></button></div></div></div><p>Paste the following snippet into the mysql prompt:</p><div class="language-sql codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#bfc7d5;--prism-background-color:#292d3e"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-sql codeBlock_bY9V thin-scrollbar"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#bfc7d5"><span class="token comment" style="color:rgb(105, 112, 152);font-style:italic">-- create a druid database, make sure to use utf8mb4 as encoding</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"></span><span class="token keyword" style="font-style:italic">CREATE</span><span class="token plain"> </span><span class="token keyword" style="font-style:italic">DATABASE</span><span class="token plain"> druid </span><span class="token keyword" style="font-style:italic">DEFAULT</span><span class="token plain"> </span><span class="token keyword" style="font-style:italic">CHARACTER</span><span class="token plain"> </span><span class="token keyword" style="font-style:italic">SET</span><span class="token plain"> utf8mb4</span><span class="token punctuation" style="color:rgb(199, 146, 234)">;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"></span><span class="token comment" style="color:rgb(105, 112, 152);font-style:italic">-- create a druid user</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"></span><span class="token keyword" style="font-style:italic">CREATE</span><span class="token plain"> </span><span class="token keyword" style="font-style:italic">USER</span><span class="token plain"> </span><span class="token string" style="color:rgb(195, 232, 141)">&#x27;druid&#x27;</span><span class="token variable" style="color:rgb(191, 199, 213)">@&#x27;localhost&#x27;</span><span class="token plain"> IDENTIFIED </span><span class="token keyword" style="font-style:italic">BY</span><span class="token plain"> </span><span class="token string" style="color:rgb(195, 232, 141)">&#x27;password&#x27;</span><span class="token punctuation" style="color:rgb(199, 146, 234)">;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"></span><span class="token comment" style="color:rgb(105, 112, 152);font-style:italic">-- grant the user all the permissions on the database we just created</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"></span><span class="token keyword" style="font-style:italic">GRANT</span><span class="token plain"> </span><span class="token keyword" style="font-style:italic">ALL</span><span class="token plain"> </span><span class="token keyword" style="font-style:italic">PRIVILEGES</span><span class="token plain"> </span><span class="token keyword" style="font-style:italic">ON</span><span class="token plain"> druid</span><span class="token punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token operator" style="color:rgb(137, 221, 255)">*</span><span class="token plain"> </span><span class="token keyword" style="font-style:italic">TO</span><span class="token plain"> </span><span class="token string" style="color:rgb(195, 232, 141)">&#x27;druid&#x27;</span><span class="token variable" style="color:rgb(191, 199, 213)">@&#x27;localhost&#x27;</span><span class="token punctuation" style="color:rgb(199, 146, 234)">;</span><br></span></code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_eSgA" aria-hidden="true"><svg viewBox="0 0 24 24" class="copyButtonIcon_y97N"><path fill="currentColor" d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg viewBox="0 0 24 24" class="copyButtonSuccessIcon_LjdS"><path fill="currentColor" d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></span></button></div></div></div></li><li><p>Configure your Druid metadata storage extension:</p><p>Add the following parameters to your Druid configuration, replacing <code>&lt;host&gt;</code>
with the location (host name and port) of the database.</p><div class="language-properties codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#bfc7d5;--prism-background-color:#292d3e"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-properties codeBlock_bY9V thin-scrollbar"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#bfc7d5"><span class="token plain">druid.extensions.loadList=[&quot;mysql-metadata-storage&quot;]</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain">druid.metadata.storage.type=mysql</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain">druid.metadata.storage.connector.connectURI=jdbc:mysql://&lt;host&gt;/druid</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain">druid.metadata.storage.connector.user=druid</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain">druid.metadata.storage.connector.password=diurd</span><br></span></code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_eSgA" aria-hidden="true"><svg viewBox="0 0 24 24" class="copyButtonIcon_y97N"><path fill="currentColor" d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg viewBox="0 0 24 24" class="copyButtonSuccessIcon_LjdS"><path fill="currentColor" d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></span></button></div></div></div></li></ol><p>If using the MariaDB connector library, set <code>druid.metadata.mysql.driver.driverClassName=org.mariadb.jdbc.Driver</code>.</p><h2 class="anchor anchorWithStickyNavbar_LWe7" id="encrypt-mysql-connections">Encrypt MySQL connections<a href="#encrypt-mysql-connections" class="hash-link" aria-label="Direct link to Encrypt MySQL connections" title="Direct link to Encrypt MySQL connections">​</a></h2><p>This extension provides support for encrypting MySQL connections. To get more information about encrypting MySQL connections using TLS/SSL in general, please refer to this <a href="https://dev.mysql.com/doc/refman/5.7/en/using-encrypted-connections.html" target="_blank" rel="noopener noreferrer">guide</a>.</p><h2 class="anchor anchorWithStickyNavbar_LWe7" id="configuration-properties">Configuration properties<a href="#configuration-properties" class="hash-link" aria-label="Direct link to Configuration properties" title="Direct link to Configuration properties">​</a></h2><table><thead><tr><th>Property</th><th>Description</th><th>Default</th><th>Required</th></tr></thead><tbody><tr><td><code>druid.metadata.mysql.ssl.useSSL</code></td><td>Enable SSL</td><td><code>false</code></td><td>no</td></tr><tr><td><code>druid.metadata.mysql.ssl.clientCertificateKeyStoreUrl</code></td><td>The file path URL to the client certificate key store.</td><td>none</td><td>no</td></tr><tr><td><code>druid.metadata.mysql.ssl.clientCertificateKeyStoreType</code></td><td>The type of the key store where the client certificate is stored.</td><td>none</td><td>no</td></tr><tr><td><code>druid.metadata.mysql.ssl.clientCertificateKeyStorePassword</code></td><td>The <a href="/docs/latest/operations/password-provider">Password Provider</a> or String password for the client key store.</td><td>none</td><td>no</td></tr><tr><td><code>druid.metadata.mysql.ssl.verifyServerCertificate</code></td><td>Enables server certificate verification.</td><td>false</td><td>no</td></tr><tr><td><code>druid.metadata.mysql.ssl.trustCertificateKeyStoreUrl</code></td><td>The file path to the trusted root certificate key store.</td><td>Default trust store provided by MySQL</td><td>yes if <code>verifyServerCertificate</code> is set to true and a custom trust store is used</td></tr><tr><td><code>druid.metadata.mysql.ssl.trustCertificateKeyStoreType</code></td><td>The type of the key store where trusted root certificates are stored.</td><td>JKS</td><td>yes if <code>verifyServerCertificate</code> is set to true and keystore type is not JKS</td></tr><tr><td><code>druid.metadata.mysql.ssl.trustCertificateKeyStorePassword</code></td><td>The <a href="/docs/latest/operations/password-provider">Password Provider</a> or String password for the trust store.</td><td>none</td><td>yes if <code>verifyServerCertificate</code> is set to true and password is not null</td></tr><tr><td><code>druid.metadata.mysql.ssl.enabledSSLCipherSuites</code></td><td>Overrides the existing cipher suites with these cipher suites.</td><td>none</td><td>no</td></tr><tr><td><code>druid.metadata.mysql.ssl.enabledTLSProtocols</code></td><td>Overrides the TLS protocols with these protocols.</td><td>none</td><td>no</td></tr></tbody></table><h2 class="anchor anchorWithStickyNavbar_LWe7" id="mysql-input-source">MySQL input source<a href="#mysql-input-source" class="hash-link" aria-label="Direct link to MySQL input source" title="Direct link to MySQL input source">​</a></h2><p>The MySQL extension provides an implementation of an SQL input source to ingest data into Druid from a MySQL database.
For more information on the input source parameters, see <a href="/docs/latest/ingestion/input-sources#sql-input-source">SQL input source</a>.</p><div class="language-json codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#bfc7d5;--prism-background-color:#292d3e"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-json codeBlock_bY9V thin-scrollbar"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#bfc7d5"><span class="token punctuation" style="color:rgb(199, 146, 234)">{</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token property">&quot;type&quot;</span><span class="token operator" style="color:rgb(137, 221, 255)">:</span><span class="token plain"> </span><span class="token string" style="color:rgb(195, 232, 141)">&quot;index_parallel&quot;</span><span class="token punctuation" style="color:rgb(199, 146, 234)">,</span><span 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