File size: 9,936 Bytes
61f3f56
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
"""
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 llava.constants import CONTROLLER_HEART_BEAT_EXPIRATION
from llava.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")