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