ScyllaDB (contrib)

Description

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.

Getting started

Install Feast with Cassandra support:

pip install "feast[cassandra]"

Create a new Feast project:

feast init REPO_NAME -t cassandra

Example (ScyllaDB)

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

Example (ScyllaDB Cloud)

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

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.

Functionality Matrix

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.

Resources

• Sample application with ScyllaDB

• ScyllaDB website

• ScyllaDB Cloud documentation