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"""
A controller manages distributed workers.
It sends worker addresses to clients.
"""
import argparse
import asyncio
import dataclasses
from enum import Enum, auto
import json
import logging
import time
from typing import List, Union
import threading
from fastapi import FastAPI, Request
from fastapi.responses import StreamingResponse
import numpy as np
import requests
import uvicorn
from mplug_owl2.constants import CONTROLLER_HEART_BEAT_EXPIRATION
from mplug_owl2.utils import build_logger, server_error_msg
logger = build_logger("controller", "controller.log")
class DispatchMethod(Enum):
LOTTERY = auto()
SHORTEST_QUEUE = auto()
@classmethod
def from_str(cls, name):
if name == "lottery":
return cls.LOTTERY
elif name == "shortest_queue":
return cls.SHORTEST_QUEUE
else:
raise ValueError(f"Invalid dispatch method")
@dataclasses.dataclass
class WorkerInfo:
model_names: List[str]
speed: int
queue_length: int
check_heart_beat: bool
last_heart_beat: str
def heart_beat_controller(controller):
while True:
time.sleep(CONTROLLER_HEART_BEAT_EXPIRATION)
controller.remove_stable_workers_by_expiration()
class Controller:
def __init__(self, dispatch_method: str):
# Dict[str -> WorkerInfo]
self.worker_info = {}
self.dispatch_method = DispatchMethod.from_str(dispatch_method)
self.heart_beat_thread = threading.Thread(
target=heart_beat_controller, args=(self,))
self.heart_beat_thread.start()
logger.info("Init controller")
def register_worker(self, worker_name: str, check_heart_beat: bool,
worker_status: dict):
if worker_name not in self.worker_info:
logger.info(f"Register a new worker: {worker_name}")
else:
logger.info(f"Register an existing worker: {worker_name}")
if not worker_status:
worker_status = self.get_worker_status(worker_name)
if not worker_status:
return False
self.worker_info[worker_name] = WorkerInfo(
worker_status["model_names"], worker_status["speed"], worker_status["queue_length"],
check_heart_beat, time.time())
logger.info(f"Register done: {worker_name}, {worker_status}")
return True
def get_worker_status(self, worker_name: str):
try:
r = requests.post(worker_name + "/worker_get_status", timeout=5)
except requests.exceptions.RequestException as e:
logger.error(f"Get status fails: {worker_name}, {e}")
return None
if r.status_code != 200:
logger.error(f"Get status fails: {worker_name}, {r}")
return None
return r.json()
def remove_worker(self, worker_name: str):
del self.worker_info[worker_name]
def refresh_all_workers(self):
old_info = dict(self.worker_info)
self.worker_info = {}
for w_name, w_info in old_info.items():
if not self.register_worker(w_name, w_info.check_heart_beat, None):
logger.info(f"Remove stale worker: {w_name}")
def list_models(self):
model_names = set()
for w_name, w_info in self.worker_info.items():
model_names.update(w_info.model_names)
return list(model_names)
def get_worker_address(self, model_name: str):
if self.dispatch_method == DispatchMethod.LOTTERY:
worker_names = []
worker_speeds = []
for w_name, w_info in self.worker_info.items():
if model_name in w_info.model_names:
worker_names.append(w_name)
worker_speeds.append(w_info.speed)
worker_speeds = np.array(worker_speeds, dtype=np.float32)
norm = np.sum(worker_speeds)
if norm < 1e-4:
return ""
worker_speeds = worker_speeds / norm
if True: # Directly return address
pt = np.random.choice(np.arange(len(worker_names)),
p=worker_speeds)
worker_name = worker_names[pt]
return worker_name
# Check status before returning
while True:
pt = np.random.choice(np.arange(len(worker_names)),
p=worker_speeds)
worker_name = worker_names[pt]
if self.get_worker_status(worker_name):
break
else:
self.remove_worker(worker_name)
worker_speeds[pt] = 0
norm = np.sum(worker_speeds)
if norm < 1e-4:
return ""
worker_speeds = worker_speeds / norm
continue
return worker_name
elif self.dispatch_method == DispatchMethod.SHORTEST_QUEUE:
worker_names = []
worker_qlen = []
for w_name, w_info in self.worker_info.items():
if model_name in w_info.model_names:
worker_names.append(w_name)
worker_qlen.append(w_info.queue_length / w_info.speed)
if len(worker_names) == 0:
return ""
min_index = np.argmin(worker_qlen)
w_name = worker_names[min_index]
self.worker_info[w_name].queue_length += 1
logger.info(f"names: {worker_names}, queue_lens: {worker_qlen}, ret: {w_name}")
return w_name
else:
raise ValueError(f"Invalid dispatch method: {self.dispatch_method}")
def receive_heart_beat(self, worker_name: str, queue_length: int):
if worker_name not in self.worker_info:
logger.info(f"Receive unknown heart beat. {worker_name}")
return False
self.worker_info[worker_name].queue_length = queue_length
self.worker_info[worker_name].last_heart_beat = time.time()
logger.info(f"Receive heart beat. {worker_name}")
return True
def remove_stable_workers_by_expiration(self):
expire = time.time() - CONTROLLER_HEART_BEAT_EXPIRATION
to_delete = []
for worker_name, w_info in self.worker_info.items():
if w_info.check_heart_beat and w_info.last_heart_beat < expire:
to_delete.append(worker_name)
for worker_name in to_delete:
self.remove_worker(worker_name)
def worker_api_generate_stream(self, params):
worker_addr = self.get_worker_address(params["model"])
if not worker_addr:
logger.info(f"no worker: {params['model']}")
ret = {
"text": server_error_msg,
"error_code": 2,
}
yield json.dumps(ret).encode() + b"\0"
try:
response = requests.post(worker_addr + "/worker_generate_stream",
json=params, stream=True, timeout=5)
for chunk in response.iter_lines(decode_unicode=False, delimiter=b"\0"):
if chunk:
yield chunk + b"\0"
except requests.exceptions.RequestException as e:
logger.info(f"worker timeout: {worker_addr}")
ret = {
"text": server_error_msg,
"error_code": 3,
}
yield json.dumps(ret).encode() + b"\0"
# Let the controller act as a worker to achieve hierarchical
# management. This can be used to connect isolated sub networks.
def worker_api_get_status(self):
model_names = set()
speed = 0
queue_length = 0
for w_name in self.worker_info:
worker_status = self.get_worker_status(w_name)
if worker_status is not None:
model_names.update(worker_status["model_names"])
speed += worker_status["speed"]
queue_length += worker_status["queue_length"]
return {
"model_names": list(model_names),
"speed": speed,
"queue_length": queue_length,
}
app = FastAPI()
@app.post("/register_worker")
async def register_worker(request: Request):
data = await request.json()
controller.register_worker(
data["worker_name"], data["check_heart_beat"],
data.get("worker_status", None))
@app.post("/refresh_all_workers")
async def refresh_all_workers():
models = controller.refresh_all_workers()
@app.post("/list_models")
async def list_models():
models = controller.list_models()
return {"models": models}
@app.post("/get_worker_address")
async def get_worker_address(request: Request):
data = await request.json()
addr = controller.get_worker_address(data["model"])
return {"address": addr}
@app.post("/receive_heart_beat")
async def receive_heart_beat(request: Request):
data = await request.json()
exist = controller.receive_heart_beat(
data["worker_name"], data["queue_length"])
return {"exist": exist}
@app.post("/worker_generate_stream")
async def worker_api_generate_stream(request: Request):
params = await request.json()
generator = controller.worker_api_generate_stream(params)
return StreamingResponse(generator)
@app.post("/worker_get_status")
async def worker_api_get_status(request: Request):
return controller.worker_api_get_status()
if __name__ == "__main__":
parser = argparse.ArgumentParser()
parser.add_argument("--host", type=str, default="localhost")
parser.add_argument("--port", type=int, default=21001)
parser.add_argument("--dispatch-method", type=str, choices=[
"lottery", "shortest_queue"], default="shortest_queue")
args = parser.parse_args()
logger.info(f"args: {args}")
controller = Controller(args.dispatch_method)
uvicorn.run(app, host=args.host, port=args.port, log_level="info") |