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href="#">Connecting to Databases</a></li><li class="theme-doc-sidebar-item-category theme-doc-sidebar-item-category-level-1 menu__list-item menu__list-item--collapsed"><a class="menu__link menu__link--sublist" href="#">Creating Charts and Dashboards</a></li><li class="theme-doc-sidebar-item-category theme-doc-sidebar-item-category-level-1 menu__list-item menu__list-item--collapsed"><a class="menu__link menu__link--sublist" href="#">Miscellaneous</a></li><li class="theme-doc-sidebar-item-category theme-doc-sidebar-item-category-level-1 menu__list-item menu__list-item--collapsed"><a class="menu__link menu__link--sublist" href="#">Contributing</a></li><li class="theme-doc-sidebar-item-link theme-doc-sidebar-item-link-level-1 menu__list-item"><a class="menu__link" href="/docs/frequently-asked-questions">Frequently Asked Questions</a></li><li class="theme-doc-sidebar-item-link theme-doc-sidebar-item-link-level-1 menu__list-item"><a class="menu__link" href="/docs/api">API</a></li><li class="theme-doc-sidebar-item-link theme-doc-sidebar-item-link-level-1 menu__list-item"><a class="menu__link" href="/docs/security">Security</a></li></ul></nav></div></aside><main class="docMainContainer_r8cw"><div class="container padding-top--md padding-bottom--lg"><div class="row"><div class="col docItemCol_zHA2"><div class="docItemContainer_oiyr"><article><div class="tocCollapsible_aw-L theme-doc-toc-mobile tocMobile_Tx6Y"><button type="button" class="clean-btn tocCollapsibleButton_zr6a">On this page</button></div><div class="theme-doc-markdown markdown"><h2 class="anchor anchorWithStickyNavbar_y2LR" id="caching">Caching<a aria-hidden="true" class="hash-link" href="#caching" title="Direct link to heading"></a></h2><p>Superset uses <a href="https://flask-caching.readthedocs.io/" target="_blank" rel="noopener noreferrer">Flask-Caching</a> for caching purpose. For security reasons, |
| there are two separate cache configs for Superset's own metadata (<code>CACHE_CONFIG</code>) and charting data queried from |
| connected datasources (<code>DATA_CACHE_CONFIG</code>). However, Query results from SQL Lab are stored in another backend |
| called <code>RESULTS_BACKEND</code>, See <a href="/docs/installation/async-queries-celery">Async Queries via Celery</a> for details.</p><p>Configuring caching is as easy as providing <code>CACHE_CONFIG</code> and <code>DATA_CACHE_CONFIG</code> in your |
| <code>superset_config.py</code> that complies with <a href="https://flask-caching.readthedocs.io/en/latest/#configuring-flask-caching" target="_blank" rel="noopener noreferrer">the Flask-Caching specifications</a>.</p><p>Flask-Caching supports various caching backends, including Redis, Memcached, SimpleCache (in-memory), or the |
| local filesystem.</p><ul><li>Memcached: we recommend using <a href="https://pypi.org/project/pylibmc/" target="_blank" rel="noopener noreferrer">pylibmc</a> client library as |
| <code>python-memcached</code> does not handle storing binary data correctly.</li><li>Redis: we recommend the <a href="https://pypi.python.org/pypi/redis" target="_blank" rel="noopener noreferrer">redis</a> Python package</li></ul><p>Both of these libraries can be installed using pip.</p><p>For chart data, Superset goes up a “timeout search path”, from a slice's configuration |
| to the datasource’s, the database’s, then ultimately falls back to the global default |
| defined in <code>DATA_CACHE_CONFIG</code>.</p><div class="codeBlockContainer_J+bg"><div class="codeBlockContent_csEI"><pre tabindex="0" class="prism-code language-undefined codeBlock_rtdJ thin-scrollbar" style="color:#393A34;background-color:#f6f8fa"><code class="codeBlockLines_1zSZ"><span class="token-line" style="color:#393A34"><span class="token plain">DATA_CACHE_CONFIG = {</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> 'CACHE_TYPE': 'redis',</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> 'CACHE_DEFAULT_TIMEOUT': 60 * 60 * 24, # 1 day default (in secs)</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> 'CACHE_KEY_PREFIX': 'superset_results',</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> 'CACHE_REDIS_URL': 'redis://localhost:6379/0',</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain">}</span><br></span></code></pre><button type="button" aria-label="Copy code to clipboard" class="copyButton_M3SB clean-btn">Copy</button></div></div><p>Custom cache backends are also supported. See <a href="https://flask-caching.readthedocs.io/en/latest/#custom-cache-backends" target="_blank" rel="noopener noreferrer">here</a> for specifics.</p><p>Superset has a Celery task that will periodically warm up the cache based on different strategies. |
| To use it, add the following to the <code>CELERYBEAT_SCHEDULE</code> section in <code>config.py</code>:</p><div class="codeBlockContainer_J+bg"><div class="codeBlockContent_csEI python"><pre tabindex="0" class="prism-code language-python codeBlock_rtdJ thin-scrollbar" style="color:#393A34;background-color:#f6f8fa"><code class="codeBlockLines_1zSZ"><span class="token-line" style="color:#393A34"><span class="token plain">CELERYBEAT_SCHEDULE </span><span class="token operator" style="color:#393A34">=</span><span class="token plain"> </span><span class="token punctuation" style="color:#393A34">{</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> </span><span class="token string" style="color:#e3116c">'cache-warmup-hourly'</span><span class="token punctuation" style="color:#393A34">:</span><span class="token plain"> </span><span class="token punctuation" style="color:#393A34">{</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> </span><span class="token string" style="color:#e3116c">'task'</span><span class="token punctuation" style="color:#393A34">:</span><span class="token plain"> </span><span class="token string" style="color:#e3116c">'cache-warmup'</span><span class="token punctuation" style="color:#393A34">,</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> </span><span class="token string" style="color:#e3116c">'schedule'</span><span class="token punctuation" style="color:#393A34">:</span><span class="token plain"> crontab</span><span class="token punctuation" style="color:#393A34">(</span><span class="token plain">minute</span><span class="token operator" style="color:#393A34">=</span><span class="token number" style="color:#36acaa">0</span><span class="token punctuation" style="color:#393A34">,</span><span class="token plain"> hour</span><span class="token operator" style="color:#393A34">=</span><span class="token string" style="color:#e3116c">'*'</span><span class="token punctuation" style="color:#393A34">)</span><span class="token punctuation" style="color:#393A34">,</span><span class="token plain"> </span><span class="token comment" style="color:#999988;font-style:italic"># hourly</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> </span><span class="token string" style="color:#e3116c">'kwargs'</span><span class="token punctuation" style="color:#393A34">:</span><span class="token plain"> </span><span class="token punctuation" style="color:#393A34">{</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> </span><span class="token string" style="color:#e3116c">'strategy_name'</span><span class="token punctuation" style="color:#393A34">:</span><span class="token plain"> </span><span class="token string" style="color:#e3116c">'top_n_dashboards'</span><span class="token punctuation" style="color:#393A34">,</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> </span><span class="token string" style="color:#e3116c">'top_n'</span><span class="token punctuation" style="color:#393A34">:</span><span class="token plain"> </span><span class="token number" style="color:#36acaa">5</span><span class="token punctuation" style="color:#393A34">,</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> </span><span class="token string" style="color:#e3116c">'since'</span><span class="token punctuation" style="color:#393A34">:</span><span class="token plain"> </span><span class="token string" style="color:#e3116c">'7 days ago'</span><span class="token punctuation" style="color:#393A34">,</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> </span><span class="token punctuation" style="color:#393A34">}</span><span class="token punctuation" style="color:#393A34">,</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> </span><span class="token punctuation" style="color:#393A34">}</span><span class="token punctuation" style="color:#393A34">,</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"></span><span class="token punctuation" style="color:#393A34">}</span><br></span></code></pre><button type="button" aria-label="Copy code to clipboard" class="copyButton_M3SB clean-btn">Copy</button></div></div><p>This will cache all the charts in the top 5 most popular dashboards every hour. For other |
| strategies, check the <code>superset/tasks/cache.py</code> file.</p><h3 class="anchor anchorWithStickyNavbar_y2LR" id="caching-thumbnails">Caching Thumbnails<a aria-hidden="true" class="hash-link" href="#caching-thumbnails" title="Direct link to heading"></a></h3><p>This is an optional feature that can be turned on by activating it’s feature flag on config:</p><div class="codeBlockContainer_J+bg"><div class="codeBlockContent_csEI"><pre tabindex="0" class="prism-code language-undefined codeBlock_rtdJ thin-scrollbar" style="color:#393A34;background-color:#f6f8fa"><code class="codeBlockLines_1zSZ"><span class="token-line" style="color:#393A34"><span class="token plain">FEATURE_FLAGS = {</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> "THUMBNAILS": True,</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> "THUMBNAILS_SQLA_LISTENERS": True,</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain">}</span><br></span></code></pre><button type="button" aria-label="Copy code to clipboard" class="copyButton_M3SB clean-btn">Copy</button></div></div><p>For this feature you will need a cache system and celery workers. All thumbnails are stored on cache |
| and are processed asynchronously by the workers.</p><p>An example config where images are stored on S3 could be:</p><div class="codeBlockContainer_J+bg"><div class="codeBlockContent_csEI python"><pre tabindex="0" class="prism-code language-python codeBlock_rtdJ thin-scrollbar" style="color:#393A34;background-color:#f6f8fa"><code class="codeBlockLines_1zSZ"><span class="token-line" style="color:#393A34"><span class="token keyword" style="color:#00009f">from</span><span class="token plain"> flask </span><span class="token keyword" style="color:#00009f">import</span><span class="token plain"> Flask</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"></span><span class="token keyword" style="color:#00009f">from</span><span class="token plain"> s3cache</span><span class="token punctuation" style="color:#393A34">.</span><span class="token plain">s3cache </span><span class="token keyword" style="color:#00009f">import</span><span class="token plain"> S3Cache</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"></span><span class="token punctuation" style="color:#393A34">.</span><span class="token punctuation" style="color:#393A34">.</span><span class="token punctuation" style="color:#393A34">.</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"></span><span class="token keyword" style="color:#00009f">class</span><span class="token plain"> </span><span class="token class-name">CeleryConfig</span><span class="token punctuation" style="color:#393A34">(</span><span class="token builtin">object</span><span class="token punctuation" style="color:#393A34">)</span><span class="token punctuation" style="color:#393A34">:</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> BROKER_URL </span><span class="token operator" style="color:#393A34">=</span><span class="token plain"> </span><span class="token string" style="color:#e3116c">"redis://localhost:6379/0"</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> CELERY_IMPORTS </span><span class="token operator" style="color:#393A34">=</span><span class="token plain"> </span><span class="token punctuation" style="color:#393A34">(</span><span class="token string" style="color:#e3116c">"superset.sql_lab"</span><span class="token punctuation" style="color:#393A34">,</span><span class="token plain"> </span><span class="token string" style="color:#e3116c">"superset.tasks"</span><span class="token punctuation" style="color:#393A34">,</span><span class="token plain"> </span><span class="token string" style="color:#e3116c">"superset.tasks.thumbnails"</span><span class="token punctuation" style="color:#393A34">)</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> CELERY_RESULT_BACKEND </span><span class="token operator" style="color:#393A34">=</span><span class="token plain"> </span><span class="token string" style="color:#e3116c">"redis://localhost:6379/0"</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> CELERYD_PREFETCH_MULTIPLIER </span><span class="token operator" style="color:#393A34">=</span><span class="token plain"> </span><span class="token number" style="color:#36acaa">10</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> CELERY_ACKS_LATE </span><span class="token operator" style="color:#393A34">=</span><span class="token plain"> </span><span class="token boolean" style="color:#36acaa">True</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain">CELERY_CONFIG </span><span class="token operator" style="color:#393A34">=</span><span class="token plain"> CeleryConfig</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"></span><span class="token keyword" style="color:#00009f">def</span><span class="token plain"> </span><span class="token function" style="color:#d73a49">init_thumbnail_cache</span><span class="token punctuation" style="color:#393A34">(</span><span class="token plain">app</span><span class="token punctuation" style="color:#393A34">:</span><span class="token plain"> Flask</span><span class="token punctuation" style="color:#393A34">)</span><span class="token plain"> </span><span class="token operator" style="color:#393A34">-</span><span class="token operator" style="color:#393A34">></span><span class="token plain"> S3Cache</span><span class="token punctuation" style="color:#393A34">:</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> </span><span class="token keyword" style="color:#00009f">return</span><span class="token plain"> S3Cache</span><span class="token punctuation" style="color:#393A34">(</span><span class="token string" style="color:#e3116c">"bucket_name"</span><span class="token punctuation" style="color:#393A34">,</span><span class="token plain"> </span><span class="token string" style="color:#e3116c">'thumbs_cache/'</span><span class="token punctuation" style="color:#393A34">)</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain">THUMBNAIL_CACHE_CONFIG </span><span class="token operator" style="color:#393A34">=</span><span class="token plain"> init_thumbnail_cache</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"></span><span class="token comment" style="color:#999988;font-style:italic"># Async selenium thumbnail task will use the following user</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain">THUMBNAIL_SELENIUM_USER </span><span class="token operator" style="color:#393A34">=</span><span class="token plain"> </span><span class="token string" style="color:#e3116c">"Admin"</span><br></span></code></pre><button type="button" aria-label="Copy code to clipboard" class="copyButton_M3SB clean-btn">Copy</button></div></div><p>Using the above example cache keys for dashboards will be <code>superset_thumb__dashboard__{ID}</code>. You can |
| override the base URL for selenium using:</p><div class="codeBlockContainer_J+bg"><div class="codeBlockContent_csEI"><pre tabindex="0" class="prism-code language-undefined codeBlock_rtdJ thin-scrollbar" style="color:#393A34;background-color:#f6f8fa"><code class="codeBlockLines_1zSZ"><span class="token-line" style="color:#393A34"><span class="token plain">WEBDRIVER_BASEURL = "https://superset.company.com"</span><br></span></code></pre><button type="button" aria-label="Copy code to clipboard" class="copyButton_M3SB clean-btn">Copy</button></div></div><p>Additional selenium web drive configuration can be set using <code>WEBDRIVER_CONFIGURATION</code>. You can |
| implement a custom function to authenticate selenium. The default function uses the <code>flask-login</code> |
| session cookie. Here's an example of a custom function signature:</p><div class="codeBlockContainer_J+bg"><div class="codeBlockContent_csEI python"><pre tabindex="0" class="prism-code language-python codeBlock_rtdJ thin-scrollbar" style="color:#393A34;background-color:#f6f8fa"><code class="codeBlockLines_1zSZ"><span class="token-line" style="color:#393A34"><span class="token keyword" style="color:#00009f">def</span><span class="token plain"> </span><span class="token function" style="color:#d73a49">auth_driver</span><span class="token punctuation" style="color:#393A34">(</span><span class="token plain">driver</span><span class="token punctuation" style="color:#393A34">:</span><span class="token plain"> WebDriver</span><span class="token punctuation" style="color:#393A34">,</span><span class="token plain"> user</span><span class="token punctuation" style="color:#393A34">:</span><span class="token plain"> </span><span class="token string" style="color:#e3116c">"User"</span><span class="token punctuation" style="color:#393A34">)</span><span class="token plain"> </span><span class="token operator" style="color:#393A34">-</span><span class="token operator" style="color:#393A34">></span><span class="token plain"> WebDriver</span><span class="token punctuation" style="color:#393A34">:</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> </span><span class="token keyword" style="color:#00009f">pass</span><br></span></code></pre><button type="button" aria-label="Copy code to clipboard" class="copyButton_M3SB clean-btn">Copy</button></div></div><p>Then on configuration:</p><div class="codeBlockContainer_J+bg"><div class="codeBlockContent_csEI"><pre tabindex="0" class="prism-code language-undefined codeBlock_rtdJ thin-scrollbar" style="color:#393A34;background-color:#f6f8fa"><code class="codeBlockLines_1zSZ"><span class="token-line" style="color:#393A34"><span class="token plain">WEBDRIVER_AUTH_FUNC = auth_driver</span><br></span></code></pre><button type="button" aria-label="Copy code to clipboard" class="copyButton_M3SB clean-btn">Copy</button></div></div></div><footer class="theme-doc-footer docusaurus-mt-lg"><div class="theme-doc-footer-edit-meta-row row"><div class="col"><a href="https://github.com/apache/superset/tree/master/docs/docs/installation/cache.mdx" target="_blank" rel="noreferrer noopener" class="theme-edit-this-page"><svg fill="currentColor" height="20" width="20" viewBox="0 0 40 40" class="iconEdit_mS5F" aria-hidden="true"><g><path d="m34.5 11.7l-3 3.1-6.3-6.3 3.1-3q0.5-0.5 1.2-0.5t1.1 0.5l3.9 3.9q0.5 0.4 0.5 1.1t-0.5 1.2z m-29.5 17.1l18.4-18.5 6.3 6.3-18.4 18.4h-6.3v-6.2z"></path></g></svg>Edit this page</a></div><div class="col lastUpdated_mt2f"></div></div></footer></article><nav class="pagination-nav docusaurus-mt-lg" aria-label="Docs pages navigation"><div class="pagination-nav__item"><a class="pagination-nav__link" 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