Druid Redis Cache

**THIS WAS MOVED TO DRUID.IO AS PR: apache/druid#4615

How to use

Refer to: http://druid.io/docs/latest/operations/including-extensions.html

Requirement

JDK 1.8 and higher.

Configuration

Below are the configuration options known to this module:

runtime.properties	Description	Default
druid.cache.host	Redis server host.	none; must be provided
druid.cache.port	Redis server port.	none; must be provided
druid.cache.expiration	Expiration(in milliseconds) for cache entries.	24 * 3600 * 1000
druid.cache.timeout	Timeout(in milliseconds) for get cache entries from Redis.	2000
druid.cache.maxTotalConnections	Max total connections to Redis(This module use JedisPool to connect to Redis).	8
druid.cache.maxIdleConnections	Max idle connections to Redis.	8
druid.cache.minIdleConnections	Min idle connections to Redis.	0

Metrics

In addition to the normal cache metrics, the redis cache implementation also reports the following in both total and delta

Metric	Description
query/cache/redis/*/requests	Count of requests to redis cache