# Redis

## Description

The [Redis](https://redis.io) online store provides support for materializing feature values into Redis.

* Both Redis and Redis Cluster are supported.
* The data model used to store feature values in Redis is described in more detail [here](https://github.com/feast-dev/feast/blob/v0.24-branch/docs/specs/online_store_format.md).

## Examples

Connecting to a single Redis instance:

{% code title="feature\_store.yaml" %}

```yaml
project: my_feature_repo
registry: data/registry.db
provider: local
online_store:
  type: redis
  connection_string: "localhost:6379"
```

{% endcode %}

Connecting to a Redis Cluster with SSL enabled and password authentication:

{% code title="feature\_store.yaml" %}

```yaml
project: my_feature_repo
registry: data/registry.db
provider: local
online_store:
  type: redis
  redis_type: redis_cluster
  connection_string: "redis1:6379,redis2:6379,ssl=true,password=my_password"
```

{% endcode %}

The full set of configuration options is available in [RedisOnlineStoreConfig](https://rtd.feast.dev/en/latest/#feast.infra.online_stores.redis.RedisOnlineStoreConfig).

## Functionality Matrix

The set of functionality supported by online stores is described in detail [here](https://docs.feast.dev/v0.24-branch/reference/overview#functionality). Below is a matrix indicating which functionality is supported by the Redis online store.

|                                                           | Redis |
| --------------------------------------------------------- | ----- |
| write feature values to the online store                  | yes   |
| read feature values from the online store                 | yes   |
| update infrastructure (e.g. tables) in the online store   | yes   |
| teardown infrastructure (e.g. tables) in the online store | yes   |
| generate a plan of infrastructure changes                 | no    |
| support for on-demand transforms                          | yes   |
| readable by Python SDK                                    | yes   |
| readable by Java                                          | yes   |
| readable by Go                                            | yes   |
| support for entityless feature views                      | yes   |
| support for concurrent writing to the same key            | yes   |
| support for ttl (time to live) at retrieval               | yes   |
| support for deleting expired data                         | yes   |
| collocated by feature view                                | no    |
| collocated by feature service                             | no    |
| collocated by entity key                                  | yes   |

To compare this set of functionality against other online stores, please see the full [functionality matrix](https://docs.feast.dev/v0.24-branch/reference/overview#functionality-matrix).