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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"feature_server.py crashes with TypeError: MessageToDict() got an unexpected keyword argument 'float_precision' on protobuf \u003e= 7.34.0","articleBody":"## Summary\n\nThe feature server crashes on every `/get-online-features` and `/retrieve-online-documents` request \nwhen running with `protobuf \u003e= 7.34.0`. The `float_precision` parameter was deprecated in protobuf \n6.32.x and **removed** in 7.34.0. Since Feast's `pyproject.toml` allows `protobuf \u003e= 4.24.0`, \nfresh installs (including the official `quay.io/feastdev/feature-server:latest` image) pull \nprotobuf 7.34.1, which does not accept this argument.\n\n## Error\n\n`TypeError: MessageToDict() got an unexpected keyword argument 'float_precision'`\n\n\nFull traceback from Gunicorn worker:\n\n`File \"/opt/app-root/lib64/python3.12/site-packages/feast/feature_server.py\", line 397 response_dict = await run_in_threadpool( MessageToDict, response.proto, preserving_proto_field_name=True, float_precision=18, # \u003c-- removed in protobuf 7.34.0 )`\n\n\nThe worker process crashes, Gunicorn master respawns it, and the next request crashes again — \nmaking the online feature server completely non-functional.\n\n## Affected Code\n\n`sdk/python/feast/feature_server.py` — two call sites:\n\n1. **`get_online_features` endpoint** (line ~398–401)\n2. **`retrieve_online_documents` endpoint** (line ~440–443)\n\nBoth pass `float_precision=18` to `google.protobuf.json_format.MessageToDict`.\n\n## Environment\n\n- **Feast version:** 0.63.0\n- **Image:** `quay.io/feastdev/feature-server:latest` (also `quay.io/feastdev-ci/feature-server:develop`)\n- **Python:** 3.12.12\n- **protobuf:** 7.34.1 (installed by pip as allowed by `protobuf\u003e=4.24.0` in pyproject.toml)\n\n## Reproducer\n\n```bash\n# 1. Install feast with latest protobuf\npip install feast\n\n# 2. Verify protobuf version\npython -c \"import google.protobuf; print(google.protobuf.__version__)\"\n# Output: 7.34.1\n\n# 3. Reproduce the crash directly\npython -c \"\nfrom google.protobuf.json_format import MessageToDict\nfrom feast.protos.feast.serving.ServingService_pb2 import GetOnlineFeaturesResponse\nresp = GetOnlineFeaturesResponse()\nMessageToDict(resp, preserving_proto_field_name=True, float_precision=18)\n\"\n\n# Output:\n# TypeError: MessageToDict() got an unexpected keyword argument 'float_precision'\n\n```\n\nOr with a running feature server, Any POST to the online server will crash the worker:\n\n```\ncurl -X POST https://\u003cfeast-server\u003e/get-online-features \\\n  -H \"Content-Type: application/json\" \\\n  -d '{\"features\": [\"my_fv:my_feature\"], \"entities\": {\"entity_id\": [1]}}'\n# Returns: 500 Internal Server Error\n\n```","author":{"url":"https://github.com/ntkathole","@type":"Person","name":"ntkathole"},"datePublished":"2026-05-27T05:54:00.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":0},"url":"https://github.com/6435/feast/issues/6435"}