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name feast-dev
description Development guide for contributing to the Feast codebase. Covers environment setup, testing, linting, project structure, and PR workflow for feast-dev/feast.
license Apache-2.0
compatibility Works with Claude Code, OpenAI Codex, and any Agent Skills compatible tool. Requires Python 3.10+, uv, and git.
metadata
author version
feast-dev
1.0

Feast Development Guide

Environment Setup

# Install development dependencies (uses uv pip sync with pinned requirements)
make install-python-dependencies-dev

# Install minimal dependencies
make install-python-dependencies-minimal

# Install pre-commit hooks (runs formatters and linters on commit)
make install-precommit

Running Tests

Unit Tests

# Run all unit tests
make test-python-unit

# Run a specific test file
python -m pytest sdk/python/tests/unit/test_unit_feature_store.py -v

# Run a specific test by name
python -m pytest sdk/python/tests/unit/test_unit_feature_store.py -k "test_apply" -v

# Run fast unit tests only (no external dependencies)
make test-python-unit-fast

Integration Tests (local)

# Run integration tests in local dev mode
make test-python-integration-local

Linting and Formatting

# Format Python code
make format-python

# Lint Python code
make lint-python

# Run all precommit checks (format + lint)
make precommit-check

# Type checking
cd sdk/python && python -m mypy feast

Code Style

  • Use type hints on all function signatures
  • Use from __future__ import annotations at the top of new files
  • Follow existing patterns in the module you are modifying
  • PR titles must follow semantic conventions: feat:, fix:, ci:, chore:, docs:
  • Add a GitHub label to PRs (e.g. kind/bug, kind/feature, kind/housekeeping)
  • Sign off commits with git commit -s (DCO requirement)

Project Structure

sdk/python/feast/          # Main Python SDK
  cli/cli.py               # CLI entry point (feast apply, feast materialize, etc.)
  feature_store.py         # FeatureStore class - core orchestration
  repo_config.py           # feature_store.yaml configuration parsing
  repo_operations.py       # feast apply / feast teardown logic
  infra/                   # Online/offline store implementations
    online_stores/         # Redis, DynamoDB, SQLite, etc.
    offline_stores/        # BigQuery, Snowflake, File, etc.
  transformation/          # On-demand and streaming transformations
protos/feast/              # Protobuf definitions
sdk/python/tests/          # Test suite
  unit/                    # Fast, no external deps
  integration/             # Requires infrastructure

Key Abstractions

  • FeatureStore (feature_store.py): Entry point for all operations
  • FeatureView: Defines a set of features from a data source
  • OnDemandFeatureView: Computed features using request-time transformations
  • Entity: Join key definition (e.g. driver_id, customer_id)
  • DataSource: Where raw data lives (BigQuery, files, Snowflake, etc.)
  • OnlineStore: Low-latency feature serving (Redis, DynamoDB, SQLite)
  • OfflineStore: Historical feature retrieval (BigQuery, Snowflake, file)