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Redis cache extension doc (#4702) 

* Redis cache extension doc

* link redis cache doc in extensions.md
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QiuMM 2017-08-24 22:53:51 +08:00 committed by Himanshu
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docs/content/development/extensions-contrib/redis-cache.md Normal file
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---
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|

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@ -61,6 +61,7 @@ All of these community extensions can be downloaded using *pull-deps* with the c
|druid-orc-extensions|Support for data in Apache Orc data format.|[link](../development/extensions-contrib/orc.html)|
|druid-parquet-extensions|Support for data in Apache Parquet data format. Requires druid-avro-extensions to be loaded.|[link](../development/extensions-contrib/parquet.html)|
|druid-rabbitmq|RabbitMQ firehose.|[link](../development/extensions-contrib/rabbitmq.html)|
|druid-redis-cache|A cache implementation for Druid based on Redis.|[link](../development/extensions-contrib/redis-cache.html)|
|druid-rocketmq|RocketMQ firehose.|[link](../development/extensions-contrib/rocketmq.html)|
|druid-time-min-max|Min/Max aggregator for timestamp.|[link](../development/extensions-contrib/time-min-max.html)|
|druid-google-extensions|Google Cloud Storage deep storage.|[link](../development/extensions-contrib/google.html)|