docs/reference/online-stores/scylladb.md
ScyllaDB is a low-latency and high-performance Cassandra-compatible (uses CQL) database. You can use the existing Cassandra connector to use ScyllaDB as an online store in Feast.
The ScyllaDB online store provides support for materializing feature values into a ScyllaDB or ScyllaDB Cloud cluster for serving online features real-time.
Install Feast with Cassandra support:
pip install "feast[cassandra]"
Create a new Feast project:
feast init REPO_NAME -t cassandra
{% code title="feature_store.yaml" %}
project: scylla_feature_repo
registry: data/registry.db
provider: local
online_store:
type: cassandra
hosts:
- 172.17.0.2
keyspace: feast
username: scylla
password: password
{% endcode %}
{% code title="feature_store.yaml" %}
project: scylla_feature_repo
registry: data/registry.db
provider: local
online_store:
type: cassandra
hosts:
- node-0.aws_us_east_1.xxxxxxxx.clusters.scylla.cloud
- node-1.aws_us_east_1.xxxxxxxx.clusters.scylla.cloud
- node-2.aws_us_east_1.xxxxxxxx.clusters.scylla.cloud
keyspace: feast
username: scylla
password: password
{% endcode %}
The full set of configuration options is available in CassandraOnlineStoreConfig.
For a full explanation of configuration options please look at file
sdk/python/feast/infra/online_stores/contrib/cassandra_online_store/README.md.
Storage specifications can be found at docs/specs/online_store_format.md.
The set of functionality supported by online stores is described in detail here. Below is a matrix indicating which functionality is supported by the Cassandra plugin.
| Cassandra | |
|---|---|
| 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 | yes |
| support for on-demand transforms | yes |
| readable by Python SDK | yes |
| readable by Java | no |
| readable by Go | no |
| support for entityless feature views | yes |
| support for concurrent writing to the same key | no |
| support for ttl (time to live) at retrieval | no |
| support for deleting expired data | no |
| collocated by feature view | yes |
| collocated by feature service | no |
| collocated by entity key | no |
To compare this set of functionality against other online stores, please see the full functionality matrix.