{"record":{"id":"cb2e5a877efd0c12","repo":"vllm-project/vllm","slug":"dbo-is-not-yet-supported-in-elastic-ep","errorCode":null,"errorMessage":"DBO is not yet supported in elastic EP","messagePattern":"DBO is not yet supported in elastic EP","errorType":"exception","errorClass":"RuntimeError","httpStatus":null,"severity":"error","filePath":"vllm/distributed/elastic_ep/elastic_execute.py","lineNumber":354,"sourceCode":"    def _commit_staged_moe_quant_methods(self) -> None:\n        model = self.worker.model_runner.get_model()\n        moe_modules = [module for module in model.modules() if is_moe_layer(module)]\n        for module in moe_modules:\n            staged_quant_method = self._staged_moe_quant_methods.pop(module, None)\n            if staged_quant_method is None:\n                continue\n            assert staged_quant_method.moe_kernel is not None\n            module._replace_quant_method(staged_quant_method)\n            staged_quant_method.moe_kernel.prepare_finalize.on_commit()\n        self._staged_moe_quant_methods.clear()\n\n    def _release_cuda_graphs(self) -> None:\n        if isinstance(self.worker.model_runner.model, CUDAGraphWrapper):\n            wrapper = self.worker.model_runner.model\n            wrapper.concrete_cudagraph_entries = {}\n\n        elif isinstance(self.worker.model_runner.model, UBatchWrapper):\n            raise RuntimeError(\"DBO is not yet supported in elastic EP\")\n\n        torch.compiler.reset()\n        with set_current_vllm_config(self.worker.vllm_config):\n            reset_compile_wrapper(self.worker.model_runner.get_model())\n\n        gc.collect()\n        torch.accelerator.synchronize()\n        torch.accelerator.empty_cache()\n\n    def switch_and_remove(self) -> None:\n        self._release_cuda_graphs()\n        _replace_active_groups(world=None, dp=None, ep=None, eplb=None, node_count=None)\n\n    def switch_and_prepare(self) -> None:\n        old_dp_size = get_dp_group().world_size\n        old_ep_size = get_ep_group().world_size\n\n        self._release_cuda_graphs()","sourceCodeStart":336,"sourceCodeEnd":372,"githubUrl":"https://github.com/vllm-project/vllm/blob/c794754062d49a8fdb63ab3c5215b488b865030c/vllm/distributed/elastic_ep/elastic_execute.py#L336-L372","documentation":"Error \"DBO is not yet supported in elastic EP\" thrown in vllm-project/vllm.","triggerScenarios":"Raised at vllm/distributed/elastic_ep/elastic_execute.py:354 when validation fails: DBO is not yet supported in elastic EP. Typically triggered by an incompatible or incomplete vLLM configuration, an unsupported platform/backend combination, or a runtime resource/dependency that is missing.","commonSituations":"Commonly encountered at vllm/distributed/elastic_ep/elastic_execute.py:354 during vLLM startup/config validation or runtime setup when: (1) conflicting CLI flags or config fields are combined, (2) the current platform (CUDA/ROCm/CPU/XPU) or installed optional packages do not support the requested feature, or (3) a required value is absent or out of range. Resolve by correcting the configuration as described in the message, or by selecting a supported alternative.","solutions":["Disable DBO (dual batch overlap) when using elastic EP; it is not supported yet."],"exampleFix":null,"handlingStrategy":null,"validationCode":null,"typeGuard":null,"tryCatchPattern":null,"preventionTips":[],"tags":[],"backgroundTag":null,"analyzedSha":"c794754062d49a8fdb63ab3c5215b488b865030c","analyzedAt":"2026-08-14T21:17:39.825Z","schemaVersion":2},"datasetVersion":"2026-08-15T22:17:37.221Z"}