mirror of https://github.com/apache/druid.git
32 lines
1.3 KiB
Markdown
32 lines
1.3 KiB
Markdown
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---
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layout: doc_page
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---
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Druid Redis Cache
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--------------------
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A cache implementation for Druid based on [Redis](https://github.com/antirez/redis).
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# Configuration
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Below are the configuration options known to this module:
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|`runtime.properties`|Description|Default|Required|
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|--------------------|-----------|-------|--------|
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|`druid.cache.host`|Redis server host|None|yes|
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|`druid.cache.port`|Redis server port|None|yes|
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|`druid.cache.expiration`|Expiration(in milliseconds) for cache entries|24 * 3600 * 1000|no|
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|`druid.cache.timeout`|Timeout(in milliseconds) for get cache entries from Redis|2000|no|
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|`druid.cache.maxTotalConnections`|Max total connections to Redis|8|no|
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|`druid.cache.maxIdleConnections`|Max idle connections to Redis|8|no|
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|`druid.cache.minIdleConnections`|Min idle connections to Redis|0|no|
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# Enabling
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To enable the redis cache, include this module on the loadList and set `druid.cache.type` to `redis` in your properties.
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# Metrics
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In addition to the normal cache metrics, the redis cache implementation also reports the following in both `total` and `delta`
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|Metric|Description|Normal value|
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|------|-----------|------------|
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|`query/cache/redis/*/requests`|Count of requests to redis cache|whatever request to redis will increase request count by 1|
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