Files
sglang/python/sglang/srt/disaggregation/common/conn.py
Shangming Cai 738cbde902 [PD] Make pending reqs resolving more robust (#20505)
Signed-off-by: Shangming Cai <csmthu@gmail.com>
2026-03-16 14:12:13 +08:00

920 lines
37 KiB
Python

from __future__ import annotations
import asyncio
import dataclasses
import logging
import threading
import time
from collections import defaultdict
from functools import cache
from typing import Dict, List, Optional, Set, Tuple, Union
import numpy as np
import numpy.typing as npt
import requests
import zmq
from aiohttp import web
from sglang.srt.disaggregation.base.conn import (
BaseKVBootstrapServer,
BaseKVManager,
BaseKVReceiver,
BaseKVSender,
KVArgs,
KVPoll,
)
from sglang.srt.disaggregation.utils import DisaggregationMode
from sglang.srt.distributed import get_pp_group
from sglang.srt.environ import envs
from sglang.srt.layers.dp_attention import (
get_attention_cp_rank,
get_attention_cp_size,
get_attention_dp_rank,
get_attention_dp_size,
get_attention_tp_rank,
get_attention_tp_size,
)
from sglang.srt.server_args import ServerArgs
from sglang.srt.utils.network import (
NetworkAddress,
get_local_ip_auto,
get_zmq_socket_on_host,
)
logger = logging.getLogger(__name__)
@dataclasses.dataclass
class PrefillServerInfo:
attn_tp_size: int
attn_cp_size: int
dp_size: int
pp_size: int
page_size: Optional[int]
kv_cache_dtype: Optional[str]
follow_bootstrap_room: bool
def __post_init__(self):
self.attn_tp_size = int(self.attn_tp_size)
self.attn_cp_size = int(self.attn_cp_size)
self.dp_size = int(self.dp_size)
self.pp_size = int(self.pp_size)
self.page_size = int(self.page_size) if self.page_size is not None else None
self.kv_cache_dtype = (
str(self.kv_cache_dtype) if self.kv_cache_dtype is not None else None
)
self.follow_bootstrap_room = bool(self.follow_bootstrap_room)
@dataclasses.dataclass
class PrefillRankInfo:
rank_ip: str
rank_port: int
def __post_init__(self):
self.rank_ip = str(self.rank_ip)
self.rank_port = int(self.rank_port)
class CommonKVManager(BaseKVManager):
def __init__(
self,
args: KVArgs,
disaggregation_mode: DisaggregationMode,
server_args: ServerArgs,
is_mla_backend: Optional[bool] = False,
):
self.kv_args = args
self.is_mla_backend = is_mla_backend
self.disaggregation_mode = disaggregation_mode
self.server_args = server_args
# for p/d multi node infer
self.bootstrap_host = server_args.host
self.bootstrap_port = server_args.disaggregation_bootstrap_port
self.dist_init_addr = server_args.dist_init_addr
self.attn_tp_size = get_attention_tp_size()
self.attn_tp_rank = get_attention_tp_rank()
self.attn_cp_size = get_attention_cp_size()
self.attn_cp_rank = get_attention_cp_rank()
self.attn_dp_size = get_attention_dp_size()
self.attn_dp_rank = get_attention_dp_rank()
self.system_dp_size = (
1 if server_args.enable_dp_attention else server_args.dp_size
)
self.system_dp_rank = (
self.kv_args.system_dp_rank if self.kv_args.system_dp_rank else 0
)
self.pp_size = server_args.pp_size
self.pp_rank = self.kv_args.pp_rank
self.local_ip = get_local_ip_auto()
self.enable_all_cp_ranks_for_transfer = (
envs.SGLANG_DISAGGREGATION_ALL_CP_RANKS_TRANSFER.get()
)
# bind zmq socket
context = zmq.Context()
self.rank_port, self.server_socket = get_zmq_socket_on_host(
context, zmq.PULL, host=self.local_ip
)
logger.debug(f"kv manager bind to {self.local_ip}:{self.rank_port}")
self.request_status: Dict[int, KVPoll] = {}
self.failure_records: Dict[int, str] = {}
self.failure_lock = threading.Lock()
if self.disaggregation_mode == DisaggregationMode.PREFILL:
# When SGLANG_DISAGGREGATION_ALL_CP_RANKS_TRANSFER is True, all CP ranks
# participate in KV transfer; Otherwise only CP rank 0 sends.
self.is_dummy_cp_rank = (
not self.enable_all_cp_ranks_for_transfer
and self.attn_cp_size > 1
and self.attn_cp_rank != 0
)
self.register_to_bootstrap()
self.transfer_infos = {}
self.decode_kv_args_table = {}
self.pp_group = get_pp_group()
# If a timeout happens on the prefill side, it means prefill instances
# fail to receive the KV indices from the decode instance of this request.
# These timeout requests should be aborted to release the tree cache.
self.bootstrap_timeout = envs.SGLANG_DISAGGREGATION_BOOTSTRAP_TIMEOUT.get()
elif self.disaggregation_mode == DisaggregationMode.DECODE:
self.connection_pool: Dict[str, Dict[str, Union[str, int]]] = {}
self.connection_lock = threading.Lock()
self.required_prefill_response_num_table: Dict[int, int] = {}
self.prefill_info_table: Dict[str, PrefillServerInfo] = {}
self.heartbeat_failures: Dict[str, int] = {}
self.session_pool: Dict = defaultdict(requests.Session)
self.session_pool_lock = threading.Lock()
self.addr_to_rooms_tracker: Dict[str, Set[int]] = defaultdict(set)
self.prefill_response_tracker: Dict[int, Set[int]] = defaultdict(set)
# Heartbeat interval should be at least 2 seconds
self.heartbeat_interval = max(
envs.SGLANG_DISAGGREGATION_HEARTBEAT_INTERVAL.get(), 2.0
)
# Heartbeat failure should be at least 1
self.max_failures = max(
envs.SGLANG_DISAGGREGATION_HEARTBEAT_MAX_FAILURE.get(), 1
)
# If a timeout happens on the decode side, it means decode instances
# fail to receive the KV Cache transfer done signal after bootstrapping.
# These timeout requests should be aborted to release the tree cache.
self.waiting_timeout = envs.SGLANG_DISAGGREGATION_WAITING_TIMEOUT.get()
else:
raise ValueError(
f"Unsupported DisaggregationMode: {self.disaggregation_mode}"
)
def check_status(self, bootstrap_room: int) -> KVPoll:
return self.request_status[bootstrap_room]
def update_status(self, bootstrap_room: int, status: KVPoll):
if bootstrap_room not in self.request_status:
self.request_status[bootstrap_room] = status
else:
if status == KVPoll.Failed:
self.request_status[bootstrap_room] = KVPoll.Failed
else:
self.request_status[bootstrap_room] = max(
self.request_status[bootstrap_room], status
)
def record_failure(self, bootstrap_room: int, failure_reason: str):
with self.failure_lock:
self.failure_records[bootstrap_room] = failure_reason
def ensure_parallel_info(self, bootstrap_addr: str) -> bool:
"""Fetch and cache prefill parallel info if not yet available.
Returns True if info is available (cached or freshly fetched).
"""
if bootstrap_addr in self.prefill_info_table:
return True
info = self._fetch_prefill_server_info(bootstrap_addr)
if info is None:
return False
if info.page_size is not None and info.page_size != self.kv_args.page_size:
raise RuntimeError(
f"Page size mismatch: prefill server has page_size={info.page_size}, "
f"but decode server has page_size={self.kv_args.page_size}. "
f"Both servers must use the same --page-size value."
)
if (
info.kv_cache_dtype is not None
and info.kv_cache_dtype != self.server_args.kv_cache_dtype
):
raise RuntimeError(
f"KV cache dtype mismatch: prefill server has kv_cache_dtype={info.kv_cache_dtype}, "
f"but decode server has kv_cache_dtype={self.server_args.kv_cache_dtype}. "
f"Both servers must use the same --kv-cache-dtype value."
)
self.prefill_info_table[bootstrap_addr] = info
logger.debug(f"Prefill parallel info for [{bootstrap_addr}]: {info}")
return True
@staticmethod
def _fetch_prefill_server_info(
bootstrap_addr: str,
) -> Optional[PrefillServerInfo]:
"""Fetch the prefill server info from the bootstrap server."""
try:
url = f"http://{bootstrap_addr}/route?prefill_dp_rank={-1}&prefill_cp_rank={-1}&target_tp_rank={-1}&target_pp_rank={-1}"
response = requests.get(url, timeout=5)
if response.status_code == 200:
data = response.json()
return PrefillServerInfo(**data)
else:
logger.error(
f"Failed to get prefill server info: {response.status_code}, {response.text}"
)
return None
except Exception as e:
logger.error(f"Error fetching prefill server info from bootstrap: {e}")
return None
def register_to_bootstrap(self):
"""Register prefill server info to bootstrap server via HTTP POST."""
if self.dist_init_addr:
# Multi-node case: bootstrap server's host is dist_init_addr
host = NetworkAddress.parse(self.dist_init_addr).host
else:
# Single-node case: bootstrap server's host is the same as http server's host
host = self.bootstrap_host
bootstrap_na = NetworkAddress(host, self.bootstrap_port)
bootstrap_server_url = bootstrap_na.to_host_port_str()
url = f"{bootstrap_na.to_url()}/route"
payload = {
"attn_tp_size": self.attn_tp_size,
"attn_tp_rank": self.attn_tp_rank,
"attn_cp_size": self.attn_cp_size,
"attn_cp_rank": self.attn_cp_rank,
"attn_dp_size": self.attn_dp_size,
"attn_dp_rank": self.attn_dp_rank,
"pp_size": self.pp_size,
"pp_rank": self.pp_rank,
"system_dp_size": self.system_dp_size,
"system_dp_rank": self.system_dp_rank,
"rank_ip": self.local_ip,
"rank_port": self.rank_port,
"page_size": self.kv_args.page_size,
"kv_cache_dtype": self.server_args.kv_cache_dtype,
"load_balance_method": self.server_args.load_balance_method,
}
try:
response = requests.put(url, json=payload, timeout=5)
if response.status_code == 200:
logger.debug("Prefill successfully registered to bootstrap server.")
else:
logger.error(
f"Prefill instance failed to connect to bootstrap server: {response.status_code}, {response.text}"
)
except Exception as e:
logger.error(
f"Prefill instance failed to register to bootstrap server: {e}"
)
@cache
def _connect(self, endpoint: str, is_ipv6: bool = False):
socket = zmq.Context().socket(zmq.PUSH)
if is_ipv6:
socket.setsockopt(zmq.IPV6, 1)
socket.connect(endpoint)
return socket
def get_mha_kv_ptrs_with_pp(
self, src_kv_ptrs: List[int], dst_kv_ptrs: List[int]
) -> Tuple[List[int], List[int], List[int], List[int], int]:
start_layer = self.kv_args.prefill_start_layer
num_kv_layers = len(src_kv_ptrs) // 2
end_layer = start_layer + num_kv_layers
dst_num_total_layers = len(dst_kv_ptrs) // 2
src_k_ptrs = src_kv_ptrs[:num_kv_layers]
src_v_ptrs = src_kv_ptrs[num_kv_layers:]
if num_kv_layers == dst_num_total_layers:
dst_k_ptrs = dst_kv_ptrs[:dst_num_total_layers]
dst_v_ptrs = dst_kv_ptrs[dst_num_total_layers:]
elif (
num_kv_layers < dst_num_total_layers
and dst_num_total_layers % num_kv_layers != 0
):
# Case: Decode has draft model KV while Prefill is deployed without speculative decoding
# dst_kv_ptrs layout: [K_main..., V_main..., draft_K..., draft_V...]
multiplier_ratio = dst_num_total_layers // num_kv_layers
dst_k_ptrs = dst_kv_ptrs[start_layer:end_layer]
v_ptr_offset = num_kv_layers * multiplier_ratio
dst_v_ptrs = dst_kv_ptrs[
v_ptr_offset + start_layer : v_ptr_offset + end_layer
]
else:
# Decode pp size should be equal to prefill pp size or 1
dst_k_ptrs = dst_kv_ptrs[start_layer:end_layer]
dst_v_ptrs = dst_kv_ptrs[
dst_num_total_layers + start_layer : dst_num_total_layers + end_layer
]
layers_current_pp_stage = len(src_k_ptrs)
return src_k_ptrs, src_v_ptrs, dst_k_ptrs, dst_v_ptrs, layers_current_pp_stage
def get_mla_kv_ptrs_with_pp(
self, src_kv_ptrs: List[int], dst_kv_ptrs: List[int]
) -> Tuple[List[int], List[int], int]:
start_layer = self.kv_args.prefill_start_layer
end_layer = start_layer + len(src_kv_ptrs)
if len(src_kv_ptrs) == len(dst_kv_ptrs):
sliced_dst_kv_ptrs = dst_kv_ptrs
else:
# Decode pp size should be equal to prefill pp size or 1
sliced_dst_kv_ptrs = dst_kv_ptrs[start_layer:end_layer]
layers_current_pp_stage = len(src_kv_ptrs)
return src_kv_ptrs, sliced_dst_kv_ptrs, layers_current_pp_stage
class CommonKVSender(BaseKVSender):
def __init__(
self,
mgr: CommonKVManager,
bootstrap_addr: str,
bootstrap_room: int,
dest_tp_ranks: List[int],
pp_rank: int,
):
self.kv_mgr = mgr
self.bootstrap_room = bootstrap_room
self.aux_index = None
self.bootstrap_server_url = bootstrap_addr
# inner state
self.curr_idx = 0
if self.kv_mgr.is_dummy_cp_rank:
# Non-authoritative CP ranks are dummy participants.
self.kv_mgr.update_status(self.bootstrap_room, KVPoll.WaitingForInput)
return
self.kv_mgr.update_status(self.bootstrap_room, KVPoll.Bootstrapping)
if (
self.kv_mgr.server_args.dp_size > 1
and self.kv_mgr.server_args.load_balance_method != "follow_bootstrap_room"
):
self._register_prefill_dp_rank()
def _register_prefill_dp_rank(self):
"""Register this request's prefill dp_rank to the bootstrap server."""
url = f"http://{self.bootstrap_server_url}/register_dp_rank"
payload = {
"bootstrap_room": self.bootstrap_room,
"dp_rank": self.kv_mgr.attn_dp_rank,
}
try:
response = requests.post(url, json=payload, timeout=5)
if response.status_code != 200:
logger.error(
f"Failed to register prefill dp_rank: {response.status_code}, {response.text}"
)
except Exception as e:
logger.error(f"Failed to register prefill dp_rank: {e}")
def init(self, num_kv_indices: int, aux_index: Optional[int] = None):
self.num_kv_indices = num_kv_indices
self.aux_index = aux_index
logger.debug(
f"CommonKVSender init with num_kv_indices: {num_kv_indices} and aux_index: {aux_index}"
)
def send(
self,
kv_indices: npt.NDArray[np.int32],
state_indices: Optional[List[int]] = None,
):
pass
def poll(self) -> KVPoll:
pass
def failure_exception(self):
raise Exception("Fake KVReceiver Exception")
class CommonKVReceiver(BaseKVReceiver):
_ctx = zmq.Context()
_socket_cache = {}
_socket_locks = {}
_global_lock = threading.Lock()
def __init__(
self,
mgr: CommonKVManager,
bootstrap_addr: str,
bootstrap_room: Optional[int] = None,
prefill_dp_rank: Optional[int] = None,
):
self.bootstrap_room = bootstrap_room
self.bootstrap_addr = bootstrap_addr
self.kv_mgr = mgr
self.kv_mgr.update_status(self.bootstrap_room, KVPoll.Bootstrapping)
if self.bootstrap_addr not in self.kv_mgr.prefill_info_table:
self.kv_mgr.record_failure(
self.bootstrap_room,
f"Could not fetch prefill parallel info from bootstrap_addr: {self.bootstrap_addr}",
f"Prefill server with bootstrap_addr: {self.bootstrap_addr} is down, prefill_info_table has been cleared."
f"Request (bootstrap_addr: {self.bootstrap_addr}) has been marked as failed.",
)
self.kv_mgr.update_status(self.bootstrap_room, KVPoll.Failed)
self.bootstrap_infos = None
return
self.prefill_info = self.kv_mgr.prefill_info_table[self.bootstrap_addr]
# Rank mapping for PD with different TP sizes per rank for target DP/CP group
if self.kv_mgr.attn_tp_size == self.prefill_info.attn_tp_size:
self.target_tp_rank = (
self.kv_mgr.kv_args.engine_rank % self.kv_mgr.attn_tp_size
)
self.required_dst_info_num = 1
self.required_prefill_response_num = 1
self.target_tp_ranks = [self.target_tp_rank]
elif self.kv_mgr.attn_tp_size > self.prefill_info.attn_tp_size:
if not self.kv_mgr.is_mla_backend:
logger.warning_once(
"Performance is NOT guaranteed when using different TP sizes for non-MLA models. "
)
self.target_tp_rank = (
self.kv_mgr.kv_args.engine_rank % self.kv_mgr.attn_tp_size
) // (self.kv_mgr.attn_tp_size // self.prefill_info.attn_tp_size)
self.required_dst_info_num = (
self.kv_mgr.attn_tp_size // self.prefill_info.attn_tp_size
)
self.required_prefill_response_num = 1
self.target_tp_ranks = [self.target_tp_rank]
else:
if not self.kv_mgr.is_mla_backend:
logger.warning_once(
"Performance is NOT guaranteed when using different TP sizes for non-MLA models. "
)
# For non-MLA models, one decode rank needs to retrieve KVCache from multiple prefill ranks for non MLA models;
self.target_tp_ranks = [
rank
for rank in range(
(self.kv_mgr.kv_args.engine_rank % self.kv_mgr.attn_tp_size)
* (self.prefill_info.attn_tp_size // self.kv_mgr.attn_tp_size),
(self.kv_mgr.kv_args.engine_rank % self.kv_mgr.attn_tp_size + 1)
* (self.prefill_info.attn_tp_size // self.kv_mgr.attn_tp_size),
)
]
# For MLA models, we can retrieve KVCache from only one prefill rank, but we still need to maintain
# multiple connections in the connection pool and have to send dummy requests to other prefill ranks,
# or the KVPoll will never be set correctly
self.target_tp_rank = self.target_tp_ranks[0]
self.required_dst_info_num = 1
if self.kv_mgr.is_mla_backend:
self.required_prefill_response_num = 1
else:
self.required_prefill_response_num = (
self.prefill_info.attn_tp_size // self.kv_mgr.attn_tp_size
)
# Decode cp size should be equal to 1
assert self.kv_mgr.attn_cp_size == 1, (
f"Decode cp size ({self.kv_mgr.attn_cp_size}) should be equal to 1",
)
if self.kv_mgr.attn_cp_size == self.prefill_info.attn_cp_size:
# This means that the prefill cp size is 1
assert self.prefill_info.attn_cp_size == 1, (
f"When prefill cp size is 1, attn cp size should be 1, but got {self.kv_mgr.attn_cp_size}",
)
self.target_cp_ranks = [self.kv_mgr.attn_cp_rank]
else:
self.target_cp_ranks = [
rank for rank in range(self.prefill_info.attn_cp_size)
]
if not self.kv_mgr.enable_all_cp_ranks_for_transfer:
# Only retrieve from prefill CP rank 0 when not using all ranks
self.target_cp_ranks = self.target_cp_ranks[:1]
self.required_prefill_response_num *= 1
else:
self.required_prefill_response_num *= (
self.prefill_info.attn_cp_size // self.kv_mgr.attn_cp_size
)
# Decode pp size should be equal to prefill pp size or 1
assert (
self.kv_mgr.pp_size == self.prefill_info.pp_size or self.kv_mgr.pp_size == 1
), (
f"Decode pp size ({self.kv_mgr.pp_size}) should be equal to prefill pp size ({self.prefill_info.pp_size}) or 1",
)
if self.prefill_info.pp_size == self.kv_mgr.pp_size:
self.target_pp_ranks = [self.kv_mgr.pp_rank]
else:
self.target_pp_ranks = [rank for rank in range(self.prefill_info.pp_size)]
self.required_prefill_response_num *= (
self.prefill_info.pp_size // self.kv_mgr.pp_size
)
self.kv_mgr.required_prefill_response_num_table[self.bootstrap_room] = (
self.required_prefill_response_num
)
assert (
prefill_dp_rank is not None
), "prefill_dp_rank must be resolved before creating receiver"
self.prefill_dp_rank = prefill_dp_rank
self._setup_bootstrap_infos()
def _setup_bootstrap_infos(self):
all_bootstrap_infos = []
# NOTE: key distinguished by bootstrap_addr, prefill_dp_rank, prefill_cp_rank, and target_tp_rank
for target_cp_rank in self.target_cp_ranks:
bootstrap_key = f"{self.bootstrap_addr}_{self.prefill_dp_rank}_{target_cp_rank}_{self.target_tp_rank}"
if bootstrap_key not in self.kv_mgr.connection_pool:
bootstrap_infos = []
for target_tp_rank in self.target_tp_ranks:
# Enable higher PP ranks to be bootstrapped earlier to make PP PD requests bootstrap more robust
for target_pp_rank in reversed(self.target_pp_ranks):
bootstrap_info = self._get_bootstrap_info_from_server(
self.prefill_dp_rank,
target_cp_rank,
target_tp_rank,
target_pp_rank,
)
if bootstrap_info is not None:
if self.kv_mgr.is_mla_backend:
# For MLA: target_tp_rank is the selected real rank, others are dummy ranks
bootstrap_info["is_dummy"] = not bool(
target_tp_rank == self.target_tp_rank
or self.target_tp_rank is None
)
else:
# For non-MLA: all target_tp_ranks are selected real ranks
bootstrap_info["is_dummy"] = False
logger.debug(
f"Fetched bootstrap info: {bootstrap_info} for DP {self.prefill_dp_rank} CP {target_cp_rank} TP {target_tp_rank} PP {target_pp_rank}"
)
bootstrap_infos.append(bootstrap_info)
else:
self.kv_mgr.record_failure(
self.bootstrap_room,
f"Could not fetch bootstrap info for: prefill_dp_rank: {self.prefill_dp_rank} prefill_cp_rank: {target_cp_rank} target_tp_rank: {target_tp_rank} and target_pp_rank {target_pp_rank}",
)
self.kv_mgr.update_status(
self.bootstrap_room, KVPoll.Failed
)
return
self.bootstrap_infos = bootstrap_infos
self.kv_mgr.connection_pool[bootstrap_key] = self.bootstrap_infos
# Register kv_args only once to prefill KVManager according to the info fetched from the bootstrap server
self._register_kv_args()
else:
self.bootstrap_infos = self.kv_mgr.connection_pool[bootstrap_key]
assert len(self.bootstrap_infos) > 0
all_bootstrap_infos.extend(self.bootstrap_infos)
self.bootstrap_infos = all_bootstrap_infos
def _get_bootstrap_info_from_server(
self, prefill_dp_rank, prefill_cp_rank, target_tp_rank, target_pp_rank
):
"""Fetch the bootstrap info from the bootstrap server."""
try:
url = f"http://{self.bootstrap_addr}/route?prefill_dp_rank={prefill_dp_rank}&prefill_cp_rank={prefill_cp_rank}&target_tp_rank={target_tp_rank}&target_pp_rank={target_pp_rank}"
response = requests.get(url, timeout=5)
if response.status_code == 200:
bootstrap_info = response.json()
return bootstrap_info
else:
logger.error(
f"Failed to get prefill server info: {response.status_code}, {response.text}"
)
return None
except Exception as e:
logger.error(f"Error fetching prefill info from bootstrap: {e}")
return None
@staticmethod
def query_prefill_dp_ranks(
bootstrap_addr: str, bootstrap_rooms: List[int]
) -> Dict[str, int]:
"""Batch query prefill dp_ranks for given bootstrap_rooms."""
try:
url = f"http://{bootstrap_addr}/query_dp_ranks"
response = requests.post(
url,
json={"bootstrap_rooms": bootstrap_rooms},
timeout=5,
)
if response.status_code == 200:
return response.json()
else:
logger.error(
f"Failed to query dp_ranks: {response.status_code}, {response.text}"
)
return {}
except Exception as e:
logger.error(f"Error querying dp_ranks from bootstrap: {e}")
return {}
@classmethod
def _connect(cls, endpoint: str, is_ipv6: bool = False):
with cls._global_lock:
if endpoint not in cls._socket_cache:
sock = cls._ctx.socket(zmq.PUSH)
if is_ipv6:
sock.setsockopt(zmq.IPV6, 1)
sock.connect(endpoint)
cls._socket_cache[endpoint] = sock
cls._socket_locks[endpoint] = threading.Lock()
return cls._socket_cache[endpoint], cls._socket_locks[endpoint]
@classmethod
def _connect_to_bootstrap_server(cls, bootstrap_info: dict):
ip_address = bootstrap_info["rank_ip"]
port = bootstrap_info["rank_port"]
na = NetworkAddress(ip_address, port)
sock, lock = cls._connect(na.to_tcp(), is_ipv6=na.is_ipv6)
return sock, lock
def _register_kv_args(self):
pass
def failure_exception(self):
raise Exception("Fake KVReceiver Exception")
class CommonKVBootstrapServer(BaseKVBootstrapServer):
def __init__(self, host: str, port: int):
self.host = host
self.port = port
self.app = web.Application()
self.store = dict()
self.lock = asyncio.Lock()
self._setup_routes()
self.pp_size = None
self.attn_tp_size = None
self.attn_cp_size = None
self.dp_size = None
self.page_size = None
self.kv_cache_dtype: Optional[str] = None
self.follow_bootstrap_room: Optional[bool] = None
self.prefill_port_table: Dict[
int, Dict[int, Dict[int, Dict[int, PrefillRankInfo]]]
] = {}
self.room_to_dp_rank: Dict[int, Dict[str, Union[int, float]]] = {}
self._registered_count = 0
self.entry_cleanup_interval = (
envs.SGLANG_DISAGGREGATION_BOOTSTRAP_ENTRY_CLEANUP_INTERVAL.get()
)
# Start bootstrap server
self.thread = threading.Thread(target=self._run_server, daemon=True)
self.run()
def run(self):
self.thread.start()
def _is_ready(self) -> bool:
if (
self.attn_tp_size is None
or self.attn_cp_size is None
or self.pp_size is None
or self.dp_size is None
):
return False
expected = self.dp_size * self.attn_cp_size * self.attn_tp_size * self.pp_size
logger.debug(
f"Expected {expected} prefill servers to be registered, {self._registered_count} registered so far"
)
return self._registered_count >= expected
def _setup_routes(self):
self.app.router.add_route("*", "/route", self._handle_route)
self.app.router.add_post("/register_dp_rank", self._handle_register_dp_rank)
self.app.router.add_post("/query_dp_ranks", self._handle_query_dp_ranks)
self.app.router.add_get("/health", self._handle_health_check)
async def _handle_health_check(self, request):
return web.Response(text="OK", status=200)
async def _handle_route(self, request: web.Request):
method = request.method
if method == "PUT":
return await self._handle_route_put(request)
elif method == "GET":
return await self._handle_route_get(request)
else:
return web.Response(
text="Method not allowed", status=405, content_type="application/json"
)
async def _handle_route_put(self, request: web.Request):
data = await request.json()
attn_tp_size = data["attn_tp_size"]
attn_tp_rank = data["attn_tp_rank"]
attn_cp_size = data["attn_cp_size"]
attn_cp_rank = data["attn_cp_rank"]
attn_dp_size = data["attn_dp_size"]
attn_dp_rank = data["attn_dp_rank"]
pp_size = data["pp_size"]
pp_rank = data["pp_rank"]
system_dp_size = data["system_dp_size"]
system_dp_rank = data["system_dp_rank"]
rank_ip = data["rank_ip"]
rank_port = int(data["rank_port"])
page_size = int(data["page_size"])
kv_cache_dtype = data["kv_cache_dtype"]
if self.attn_tp_size is None:
self.attn_tp_size = attn_tp_size
if self.attn_cp_size is None:
self.attn_cp_size = attn_cp_size
if self.dp_size is None:
self.dp_size = attn_dp_size if system_dp_size == 1 else system_dp_size
if self.pp_size is None:
self.pp_size = pp_size
if self.page_size is None and page_size is not None:
self.page_size = page_size
if self.kv_cache_dtype is None and kv_cache_dtype is not None:
self.kv_cache_dtype = kv_cache_dtype
if self.follow_bootstrap_room is None:
load_balance_method = data.get(
"load_balance_method", "follow_bootstrap_room"
)
self.follow_bootstrap_room = load_balance_method == "follow_bootstrap_room"
if system_dp_size == 1:
dp_group = attn_dp_rank
else:
dp_group = system_dp_rank
# Add lock to make sure thread-safe
async with self.lock:
dp_group_table = self.prefill_port_table.setdefault(dp_group, {})
cp_group_table = dp_group_table.setdefault(attn_cp_rank, {})
tp_group_table = cp_group_table.setdefault(attn_tp_rank, {})
tp_group_table[pp_rank] = PrefillRankInfo(
rank_ip=rank_ip,
rank_port=rank_port,
)
self._registered_count += 1
expected = self.dp_size * self.attn_cp_size * self.attn_tp_size * self.pp_size
logger.debug(
f"Register prefill bootstrap: DP{dp_group} CP{attn_cp_rank} TP{attn_tp_rank} PP{pp_rank} with rank_ip: {rank_ip} and rank_port: {rank_port}"
f" ({self._registered_count}/{expected} registered)"
)
return web.Response(text="OK", status=200)
async def _handle_route_get(self, request: web.Request):
prefill_dp_rank = request.query.get("prefill_dp_rank")
prefill_cp_rank = request.query.get("prefill_cp_rank")
target_tp_rank = request.query.get("target_tp_rank")
target_pp_rank = request.query.get("target_pp_rank")
if (
not prefill_dp_rank
or not prefill_cp_rank
or not target_tp_rank
or not target_pp_rank
):
return web.Response(text="Missing inputs for bootstrap server.", status=400)
if (
int(prefill_dp_rank) == -1
and int(prefill_cp_rank) == -1
and int(target_tp_rank) == -1
and int(target_pp_rank) == -1
):
if not self._is_ready():
return web.Response(
text=f"Prefill server not fully registered yet"
f" ({self._registered_count} workers registered).",
status=503,
)
info = PrefillServerInfo(
attn_tp_size=self.attn_tp_size,
attn_cp_size=self.attn_cp_size,
dp_size=self.dp_size,
pp_size=self.pp_size,
page_size=self.page_size,
kv_cache_dtype=self.kv_cache_dtype,
follow_bootstrap_room=(
self.follow_bootstrap_room
if self.follow_bootstrap_room is not None
else True
),
)
return web.json_response(dataclasses.asdict(info), status=200)
if not self._is_ready():
return web.Response(
text=f"Prefill server not fully registered yet"
f" ({self._registered_count} workers registered).",
status=503,
)
# Find corresponding prefill info
try:
async with self.lock:
bootstrap_info = self.prefill_port_table[int(prefill_dp_rank)][
int(prefill_cp_rank)
][int(target_tp_rank)][int(target_pp_rank)]
except KeyError:
return web.Response(
text=f"Bootstrap info not found for dp_rank={prefill_dp_rank} cp_rank={prefill_cp_rank} "
f"tp_rank={target_tp_rank} pp_rank={target_pp_rank}",
status=404,
)
return web.json_response(dataclasses.asdict(bootstrap_info), status=200)
async def _handle_register_dp_rank(self, request: web.Request):
data = await request.json()
bootstrap_room = int(data["bootstrap_room"])
dp_rank = int(data["dp_rank"])
async with self.lock:
self.room_to_dp_rank[bootstrap_room] = {
"dp_rank": dp_rank,
"timestamp": time.time(),
}
logger.debug(f"Registered dp_rank={dp_rank} for {bootstrap_room=}")
return web.Response(text="OK", status=200)
async def _handle_query_dp_ranks(self, request: web.Request):
data = await request.json()
bootstrap_rooms = data["bootstrap_rooms"]
result = {}
async with self.lock:
for room in bootstrap_rooms:
room_int = int(room)
if room_int in self.room_to_dp_rank:
result[str(room_int)] = self.room_to_dp_rank[room_int]["dp_rank"]
return web.json_response(result, status=200)
async def _cleanup_expired_entries(self):
"""Remove entries older than cleanup interval from room_to_dp_rank."""
while True:
await asyncio.sleep(self.entry_cleanup_interval)
current_time = time.time()
async with self.lock:
expired_keys = [
key
for key, value in self.room_to_dp_rank.items()
if current_time - value["timestamp"] > self.entry_cleanup_interval
]
for key in expired_keys:
del self.room_to_dp_rank[key]
if expired_keys:
logger.debug(
f"Cleaned up {len(expired_keys)} expired entries from room_to_dp_rank"
)
def _run_server(self):
try:
# Event Loop
self._loop = asyncio.new_event_loop()
asyncio.set_event_loop(self._loop)
self._loop.create_task(self._cleanup_expired_entries())
access_log = None
if logging.getLogger(__name__).getEffectiveLevel() <= logging.DEBUG:
access_log = self.app.logger
self._runner = web.AppRunner(self.app, access_log=access_log)
self._loop.run_until_complete(self._runner.setup())
site = web.TCPSite(self._runner, host=self.host, port=self.port)
self._loop.run_until_complete(site.start())
self._loop.run_forever()
except Exception as e:
logger.error(f"Server error: {str(e)}")
finally:
# Cleanup
self._loop.run_until_complete(self._runner.cleanup())
self._loop.close()
def close(self):
"""Shutdown"""
if self._loop is not None and self._loop.is_running():
self._loop.call_soon_threadsafe(self._loop.stop)
logger.info("Stopping server loop...")
if self.thread.is_alive():
self.thread.join(timeout=2)
logger.info("Server thread stopped")
def poll(self) -> KVPoll: ...