Couchbase

NOTE: This is a community-contributed online store that is in alpha development. It is not officially supported by the Feast project.

Description

The Couchbase online store provides support for materializing feature values into a Couchbase Operational cluster for serving online features in real-time.

  • Only the latest feature values are persisted

  • Features are stored in a document-oriented format

The data model for using Couchbase as an online store follows a document format:

  • Document ID: {project}:{table_name}:{entity_key_hex}:{feature_name}

  • Document Content:

    • metadata:

      • event_ts (ISO formatted timestamp)

      • created_ts (ISO formatted timestamp)

      • feature_name (String)

    • value (Base64 encoded protobuf binary)

Getting started

In order to use this online store, you'll need to run pip install 'feast[couchbase]'. You can then get started with the command feast init REPO_NAME -t couchbase.

To get started with Couchbase Capella Operational:

  1. Create a bucket

    • This can be named anything, but must correspond to the bucket described in the feature_store.yaml configuration file.

  2. Create cluster access credentials

    • These credentials should have full access to the bucket created in step 3.

  3. Configure allowed IP addresses

    • You must allow the IP address of the machine running Feast.

Example

feature_store.yaml
project: my_feature_repo
registry: data/registry.db
provider: local
online_store:
  type: couchbase
  connection_string: couchbase://127.0.0.1 # Couchbase connection string, copied from 'Connect' page in Couchbase Capella console
  user: Administrator  # Couchbase username from access credentials
  password: password  # Couchbase password from access credentials
  bucket_name: feast  # Couchbase bucket name, defaults to feast
  kv_port: 11210  # Couchbase key-value port, defaults to 11210. Required if custom ports are used. 
entity_key_serialization_version: 2

The full set of configuration options is available in CouchbaseOnlineStoreConfig.

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 Couchbase online store.

Couchbase

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

no

readable by Go

no

support for entityless feature views

yes

support for concurrent writing to the same key

yes

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.

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