作为一个celery的初学者，我试图在我的简单的flask web项目中添加celery的异步特性。在安装并启动celery、redis和相关的python pip之后，我在一开始就遇到了卡在task.delay()的问题。很沮丧，能帮我一下吗?
在flask项目中有app.py和tasks.py。(一开始我把所有东西都写在app.py中，然后我把celery对象分开，但没有任何帮助)
tasks.py:
from celery import Celery
celery = Celery('app', broker='redis://localhost:6379/0', backend='redis://localhost:6379/1')
@celery.task
def modeling_task():
print('yes')
app.py:
@app.route('/train', methods=['GET', 'POST'])
def train():
if request.method == "GET":
return render_template('train.html')
else: # when request POST
# check if the post request has the file part
if 'file' not in request.files:
return jsonify({"code": 500, "status": 'No file is uploaded!'})
if file and allowed_file(file.filename):
print(request.files['file'].filename)
print('before task')
task = modeling_task.delay()
print('after task')
return jsonify({"code": 200, "status": 'model training', "task_id": task.id})
return 'Uploading file is wrong'
按理说，当server接收到前端上传的文件时，控制台应该输出这些
Car_TEST.csv
before task
yes
after task
但实际上输出的是这样
* Detected change in 'C:\\Users\\headmaster\\Desktop\\WEB\\tasks.py', reloading
* Restarting with stat
* Debugger is active!
* Debugger PIN: 308-608-393
* Running on http://127.0.0.1:5000/ (Press CTRL+C to quit)
127.0.0.1 - - [22/Apr/2020 11:39:22] "GET /train HTTP/1.1" 200 -
Car_TEST.csv
before task
然后server就一直卡在这里了
好像"task = modeling_task.delay()" 根本就没执行
是因为它有执行，然后“yes”被打印在别的地方了吗？
为什么会一直卡在那呢？
下面是celery的report
(base) C:\Users\headmaster\Desktop\WEB>celery -A tasks report
software -> celery:4.4.2 (cliffs) kombu:4.6.8 py:3.7.4
billiard:3.6.3.0 redis:3.4.1
platform -> system:Windows arch:64bit, WindowsPE
kernel version:10 imp:CPython
loader -> celery.loaders.app.AppLoader
settings -> transport:redis results:redis://localhost:6379/1
broker_url: 'redis://localhost:6379/0'
result_backend: 'redis://localhost:6379/1'
celery的运行状态：
(base) C:\Users\headmaster\Desktop\WEB>celery worker -A tasks.celery --loglevel=info
-------------- celery@LAPTOP-KLKJCK2F v4.4.2 (cliffs)
--- ***** -----
-- ******* ---- Windows-10-10.0.18362-SP0 2020-04-22 10:55:13
- *** --- * ---
- ** ---------- [config]
- ** ---------- .> app: app:0x2526977ac08
- ** ---------- .> transport: redis://localhost:6379/0
- ** ---------- .> results: redis://localhost:6379/1
- *** --- * --- .> concurrency: 4 (prefork)
-- ******* ---- .> task events: OFF (enable -E to monitor tasks in this worker)
--- ***** -----
-------------- [queues]
.> celery exchange=celery(direct) key=celery
[tasks]
. tasks.modeling_task
[2020-04-22 10:55:15,501: INFO/SpawnPoolWorker-1] child process 6692 calling self.run()
[2020-04-22 10:55:15,511: INFO/SpawnPoolWorker-2] child process 17736 calling self.run()
[2020-04-22 10:55:15,518: INFO/SpawnPoolWorker-3] child process 16320 calling self.run()
[2020-04-22 10:55:15,571: INFO/SpawnPoolWorker-4] child process 5608 calling self.run()
[2020-04-22 10:55:15,972: INFO/MainProcess] Connected to redis://localhost:6379/0
[2020-04-22 10:55:20,332: INFO/MainProcess] mingle: searching for neighbors
[2020-04-22 10:55:27,369: INFO/MainProcess] mingle: all alone
[2020-04-22 10:55:35,402: INFO/MainProcess] celery@LAPTOP-KLKJCK2F ready.
redis的启动状态：
PS D:\Applications\Redis> redis-server redis.conf
_._
_.-``__ ''-._
_.-`` `. `_. ''-._ Redis 3.2.100 (00000000/0) 64 bit
.-`` .-```. ```\/ _.,_ ''-._
( ' , .-` | `, ) Running in standalone mode
|`-._`-...-` __...-.``-._|'` _.-'| Port: 6379
| `-._ `._ / _.-' | PID: 21420
`-._ `-._ `-./ _.-' _.-'
|`-._`-._ `-.__.-' _.-'_.-'|
| `-._`-._ _.-'_.-' | http://redis.io
`-._ `-._`-.__.-'_.-' _.-'
|`-._`-._ `-.__.-' _.-'_.-'|
| `-._`-._ _.-'_.-' |
`-._ `-._`-.__.-'_.-' _.-'
`-._ `-.__.-' _.-'
`-._ _.-'
`-.__.-'
[21420] 22 Apr 10:38:22.506 # Server started, Redis version 3.2.100
[21420] 22 Apr 10:38:22.508 * DB loaded from disk: 0.000 seconds
[21420] 22 Apr 10:38:22.508 * The server is now ready to accept connections on port 6379
[21420] 22 Apr 10:43:23.025 * 10 changes in 300 seconds. Saving...
[21420] 22 Apr 10:43:23.030 * Background saving started by pid 6204
[21420] 22 Apr 10:43:23.231 # fork operation complete
[21420] 22 Apr 10:43:23.232 * Background saving terminated with success
[21420] 22 Apr 10:51:18.099 * 10 changes in 300 seconds. Saving...
[21420] 22 Apr 10:51:18.103 * Background saving started by pid 10116
[21420] 22 Apr 10:51:18.305 # fork operation complete
[21420] 22 Apr 10:51:18.306 * Background saving terminated with success
[21420] 22 Apr 10:56:19.022 * 10 changes in 300 seconds. Saving...
[21420] 22 Apr 10:56:19.026 * Background saving started by pid 11748
[21420] 22 Apr 10:56:19.227 # fork operation complete
[21420] 22 Apr 10:56:19.227 * Background saving terminated with success
