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| <h1 id="druid-redis-cache">Druid Redis Cache</h1> |
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| <p>A cache implementation for Druid based on <a href="https://github.com/antirez/redis">Redis</a>.</p> |
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| <h1 id="configuration">Configuration</h1> |
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| <p>Below are the configuration options known to this module.</p> |
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| <p>Note that just adding these properties does not enable the cache. You still need to add the <code>druid.<nodetype>.cache.useCache</code> and <code>druid.<nodetype>.cache.populateCache</code> properties for the nodes you want to enable the cache on as described in the <a href="../../configuration/index.html#cache-configuration">cache configuration docs</a>.</p> |
| |
| <p>A possible configuration would be to keep the properties below in your <code>common.runtime.properties</code> file (present on all nodes) and then add <code>druid.<nodetype>.cache.useCache</code> and <code>druid.<nodetype>.cache.populateCache</code> in the <code>runtime.properties</code> file of the node types you want to enable caching on.</p> |
| |
| <table><thead> |
| <tr> |
| <th><code>common.runtime.properties</code></th> |
| <th>Description</th> |
| <th>Default</th> |
| <th>Required</th> |
| </tr> |
| </thead><tbody> |
| <tr> |
| <td><code>druid.cache.host</code></td> |
| <td>Redis server host</td> |
| <td>None</td> |
| <td>yes</td> |
| </tr> |
| <tr> |
| <td><code>druid.cache.port</code></td> |
| <td>Redis server port</td> |
| <td>None</td> |
| <td>yes</td> |
| </tr> |
| <tr> |
| <td><code>druid.cache.expiration</code></td> |
| <td>Expiration(in milliseconds) for cache entries</td> |
| <td>24 * 3600 * 1000</td> |
| <td>no</td> |
| </tr> |
| <tr> |
| <td><code>druid.cache.timeout</code></td> |
| <td>Timeout(in milliseconds) for get cache entries from Redis</td> |
| <td>2000</td> |
| <td>no</td> |
| </tr> |
| <tr> |
| <td><code>druid.cache.maxTotalConnections</code></td> |
| <td>Max total connections to Redis</td> |
| <td>8</td> |
| <td>no</td> |
| </tr> |
| <tr> |
| <td><code>druid.cache.maxIdleConnections</code></td> |
| <td>Max idle connections to Redis</td> |
| <td>8</td> |
| <td>no</td> |
| </tr> |
| <tr> |
| <td><code>druid.cache.minIdleConnections</code></td> |
| <td>Min idle connections to Redis</td> |
| <td>0</td> |
| <td>no</td> |
| </tr> |
| </tbody></table> |
| |
| <h1 id="enabling">Enabling</h1> |
| |
| <p>To enable the redis cache, include this module on the loadList and set <code>druid.cache.type</code> to <code>redis</code> in your properties.</p> |
| |
| <h1 id="metrics">Metrics</h1> |
| |
| <p>In addition to the normal cache metrics, the redis cache implementation also reports the following in both <code>total</code> and <code>delta</code></p> |
| |
| <table><thead> |
| <tr> |
| <th>Metric</th> |
| <th>Description</th> |
| <th>Normal value</th> |
| </tr> |
| </thead><tbody> |
| <tr> |
| <td><code>query/cache/redis/*/requests</code></td> |
| <td>Count of requests to redis cache</td> |
| <td>whatever request to redis will increase request count by 1</td> |
| </tr> |
| </tbody></table> |
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