{"record":{"id":"bcce4996a1e67ada","repo":"vllm-project/vllm","slug":"hf3fs-fuse-io-is-not-available-please-install-the","errorCode":null,"errorMessage":"hf3fs_fuse.io is not available. Please install the hf3fs_fuse package.","messagePattern":"hf3fs_fuse\\.io is not available\\. Please install the hf3fs_fuse package\\.","errorType":"exception","errorClass":"ImportError","httpStatus":null,"severity":"error","filePath":"vllm/distributed/kv_transfer/kv_connector/v1/hf3fs/hf3fs_client.py","lineNumber":72,"sourceCode":"                return func(self, *args, **kwargs)\n\n        return wrapper\n\n    return _decorator\n\n\nclass Hf3fsClient:\n    def __init__(self, path: str, size: int, bytes_per_page: int, entries: int):\n        \"\"\"Initialize the HF3FS client with hf3fs_fuse.\n\n        Args:\n            path: Path to the file used for storage\n            size: Total size of the storage file in bytes\n            bytes_per_page: Size of each page in bytes\n            entries: Maximum number of concurrent operations\n        \"\"\"\n        if not HF3FS_AVAILABLE:\n            raise ImportError(\n                \"hf3fs_fuse.io is not available. Please install the hf3fs_fuse package.\"\n            )\n\n        self.path = path\n        self.size = size\n        self.bytes_per_page = bytes_per_page\n        self.entries = entries\n\n        self._closed = False\n\n        self.file = None\n        self.shm_r = None\n        self.shm_w = None\n        self.ior_r = None\n        self.ior_w = None\n        self.iov_r = None\n        self.iov_w = None\n        try:","sourceCodeStart":54,"sourceCodeEnd":90,"githubUrl":"https://github.com/vllm-project/vllm/blob/c794754062d49a8fdb63ab3c5215b488b865030c/vllm/distributed/kv_transfer/kv_connector/v1/hf3fs/hf3fs_client.py#L54-L90","documentation":"Hf3fsClient.__init__ checks the module-level HF3FS_AVAILABLE flag (set by a try-import of hf3fs_fuse.io) and raises ImportError when the hf3fs_fuse package is absent. The HF3FS connector stores KV pages in a shared file via hf3fs_fuse, so the package is a hard requirement.","triggerScenarios":"Instantiating Hf3fsClient (directly or via the HF3FS KV connector) in a Python environment where 'import hf3fs_fuse.io' failed at module load time.","commonSituations":"Using the SharedStorage/HF3FS connector without installing hf3fs_fuse; running in a container image that lacks the package; hf3fs_fuse installed for a different Python interpreter.","solutions":["Install the hf3fs_fuse package into the vLLM environment (pip install hf3fs-fuse or per project docs)","Verify: python -c \"import hf3fs_fuse.io\"","If using containers, rebuild the image with hf3fs_fuse included"],"exampleFix":"# before\nclient = Hf3fsClient(path, size, bytes_per_page, entries)  # hf3fs_fuse missing\n\n# after\npip install hf3fs_fuse\nclient = Hf3fsClient(path, size, bytes_per_page, entries)","handlingStrategy":"try-catch","validationCode":"try:\n    import hf3fs_fuse.io  # noqa\nexcept ImportError:\n    raise SystemExit(\"Install hf3fs_fuse before using the HF3FS connector\")","typeGuard":null,"tryCatchPattern":"try:\n    client = Hf3fsClient(path, size, bytes_per_page, entries)\nexcept ImportError as e:\n    raise SystemExit(f\"Missing dependency: {e}\") from e","preventionTips":["Bake hf3fs_fuse into container images used for HF3FS KV transfer","Verify optional imports in a startup readiness probe"],"tags":["kv-transfer","hf3fs","import","dependencies","vllm"],"backgroundTag":null,"analyzedSha":"c794754062d49a8fdb63ab3c5215b488b865030c","analyzedAt":"2026-08-14T21:17:39.825Z","schemaVersion":2},"datasetVersion":"2026-08-15T17:31:12.345Z"}