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[BugFix] Adapt mooncake_connector_v1 to latest vllm #1080

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[BugFix] Adapt mooncake_connector_v1 to latest vllm #1080

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bf8c9c8
fix
ZeldaHuang Nov 19, 2025
24e164d
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ZeldaHuang Nov 19, 2025
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13 changes: 6 additions & 7 deletions mooncake-wheel/mooncake/mooncake_connector_v1.py
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Original file line number Diff line number Diff line change
Expand Up @@ -22,16 +22,15 @@
import torch
import zmq

from vllm.attention.selector import backend_name_to_enum, get_attn_backend
from vllm.attention.selector import AttentionBackendEnum, get_attn_backend
from vllm.config import VllmConfig
from vllm.distributed.kv_transfer.kv_connector.v1.base import (
KVConnectorBase_V1, KVConnectorMetadata, KVConnectorRole)
from vllm.distributed.parallel_state import (get_tensor_model_parallel_rank,
get_tp_group)
from vllm.forward_context import ForwardContext
from vllm.logger import init_logger
from vllm.platforms import _Backend
from vllm.utils import get_ip, make_zmq_path, make_zmq_socket
from vllm.utils.network_utils import get_ip, make_zmq_path, make_zmq_socket
from vllm.v1.attention.backends.utils import get_kv_cache_layout
from vllm.v1.core.sched.output import SchedulerOutput
from vllm.v1.request import RequestStatus
Expand Down Expand Up @@ -114,6 +113,7 @@ class MooncakeConnector(KVConnectorBase_V1):
def __init__(self, vllm_config: VllmConfig, role: KVConnectorRole):
assert vllm_config.kv_transfer_config is not None
assert vllm_config.kv_transfer_config.engine_id is not None
super().__init__(vllm_config, role)
self.engine_id: EngineId = vllm_config.kv_transfer_config.engine_id

if role == KVConnectorRole.SCHEDULER:
Expand Down Expand Up @@ -425,12 +425,11 @@ def __init__(self, vllm_config: VllmConfig, engine_id: str):
self.model_config.dtype,
self.cache_config.cache_dtype,
self.block_size,
self.model_config.is_attention_free,
use_mla=self.use_mla)
self.backend_name = backend.get_name()
attn_backend = backend_name_to_enum(self.backend_name)
self._use_flashinfer = attn_backend == _Backend.FLASHINFER_VLLM_V1
self._use_pallas_v1 = attn_backend == _Backend.PALLAS_VLLM_V1
attn_backend = AttentionBackendEnum[self.backend_name]
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@gemini-code-assist gemini-code-assist bot Nov 19, 2025

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critical

The current implementation AttentionBackendEnum[self.backend_name] attempts to access an enum member by its name. However, self.backend_name (e.g., 'flashinfer') is the value of the enum member, not its name (e.g., 'FLASHINFER'). This will cause a KeyError at runtime, preventing the worker from initializing.

To correctly get the enum member from its value, you should call the enum as a function: AttentionBackendEnum(self.backend_name).

Suggested change
attn_backend = AttentionBackendEnum[self.backend_name]
attn_backend = AttentionBackendEnum(self.backend_name)

self._use_flashinfer = attn_backend in [AttentionBackendEnum.FLASHINFER, AttentionBackendEnum.FLASHINFER_MLA]
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@stmatengss stmatengss Nov 24, 2025

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if vllm.version = xxx
    Use _Backend
elif vllm version = yyy
    Use AttentionBackendEnum
else
    raise Exception("we don't support this vllm version")

self._use_pallas_v1 = attn_backend == AttentionBackendEnum.PALLAS
self.kv_cache_layout = get_kv_cache_layout()
logger.debug("Detected attention backend %s", self.backend_name)
logger.debug("Detected kv cache layout %s", self.kv_cache_layout)
Expand Down
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