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franciscojavierarceo merged 2 commits into from
Oct 27, 2025
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feat: Add document of Go feature server. #5697

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feat: Add document of Go feature server.
Oct 27, 2025
6057da2
fix: Fix typos.
Oct 27, 2025
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54 changes: 54 additions & 0 deletions docs/reference/feature-servers/go-feature-server.md
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# Go feature server (Alpha)

## Overview
The Go feature server is an HTTP/gRPC endpoint that serves features. It is written in Go.

## Configuration of `feature_store.yaml`
The current Go feature server needs a Python based feature Transformation service support. Please refer to the following code as an example:
```
# -*- coding: utf-8 -*-
from feast.feature_store import FeatureStore


def main():
# Init the Feature Store
store = FeatureStore(repo_path="./feature_repo/")

# Start the feature transformation server
# default port is 6569
store.serve_transformations(6569)

if __name__ == "__main__":
main()
```
At the same time, we need to configure the `feature_store.yaml` as following:

```
...
entity_key_serialization_version: 3
feature_server:
type: local
transformation_service_endpoint: "localhost:6569"
...
```
## Supported APIs
Here is the list of supported APIs:
| Method | API | Comment |
|:---: | :---: | :---: |
| POST | /get-online-features | Retrieve features of one or many entities |
| GET | /health | Status of the Go Feature Server |

## OTEL based Observability
The Go feature server support [OTEL](https://opentelemetry.io/) based Observabilities.
To enable it, we need to set the global env `ENABLE_OTEL_TRACING` to `"true"` (as a string type!) in the container or your local OS.
```
export ENABLE_OTEL_TRACING='true'
```
There are example OTEL infra setup under the `/go/infra/docker/otel` folder.

## Demo
Please check the Reference[2] for a local demo of Go feature server. If you want to see a real world example of applying Go feature server in Production, please check Reference[1].

## Reference
1. [Expedia Group's Go Feature Server Implementation (in Production)](https://github.com/EXPEbdodla/feast)
2. [A Go Feature server demo from Feast](https://github.com/feast-dev/feast-credit-score-local-tutorial)
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