关于python：Gunicorn + flask + pymongo + gevent在初始化时挂起


Gunicorn+flask+pymongo+gevent hangs on initialization

简单测试应用程序：

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from gevent import monkey
monkey.patch_all()

from pymongo import Connection, MongoClient
from flask import Flask, make_response

app = Flask(__name__)
print"connect"
connection = MongoClient("host1, host2, host3", 27017, max_pool_size=4, **{"connectTimeoutMS": 3000,"socketTimeoutMS": 3000,"use_greenlets": True})
print"db"
db = connection.barn_2

@app.route('/')
def hello_world():
    return make_response("Hello world!", 200, {'Content-type': 'application/json; charset=UTF-8'})

if __name__ == '__main__':
    app.run()

如果它是作为独立应用程序运行的，那么它就可以很好地工作：

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shcheklein@hostname:~$ python test.py
connect
db
 * Running on http://127.0.0.1:5000/
127.0.0.1 - - [07/Apr/2014 13:07:31]"GET / HTTP/1.1" 200 -
^CKeyboardInterrupt

但未能从Gunicorn开始：

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shcheklein@hostname:~$ gunicorn -w 1 -k gevent -t 5 --debug test:app
2014-04-07 13:15:04 [9752] [INFO] Starting gunicorn 18.0
2014-04-07 13:15:04 [9752] [INFO] Listening at: http://127.0.0.1:8000 (9752)
2014-04-07 13:15:04 [9752] [INFO] Using worker: gevent
2014-04-07 13:15:04 [9757] [INFO] Booting worker with pid: 9757
connect
2014-04-07 13:15:09 [9752] [CRITICAL] WORKER TIMEOUT (pid:9757)
2014-04-07 13:15:09 [9752] [CRITICAL] WORKER TIMEOUT (pid:9757)
2014-04-07 13:15:10 [9787] [INFO] Booting worker with pid: 9787
connect
2014-04-07 13:15:15 [9752] [CRITICAL] WORKER TIMEOUT (pid:9787)
2014-04-07 13:15:15 [9752] [CRITICAL] WORKER TIMEOUT (pid:9787)
2014-04-07 13:15:16 [9809] [INFO] Booting worker with pid: 9809
connect
2014-04-07 13:15:21 [9752] [CRITICAL] WORKER TIMEOUT (pid:9809)
2014-04-07 13:15:21 [9752] [CRITICAL] WORKER TIMEOUT (pid:9809)
2014-04-07 13:15:22 [9830] [INFO] Booting worker with pid: 9830

一些注释：

  • 如果关闭gevent(猴子修补和Gunicorn工人班)，它会很好地工作。
  • 如果每个传入请求都创建了db对象，那么它就会工作。
  • 版本：gevent 1.0、gunircon 18.0、pymongo 2.6.2、flask 0.9、python 2.6.5

我怀疑这是初始化和共享数据库池的正确方法。不过，如果有其他方法可以在请求之间共享对象，我还是找不到任何地方。

好吧，这是同一个问题：

https://jira.mongodb.org/browse/python-607

对我有用的解决方法：

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from gevent import monkey
monkey.patch_all()

unicode('foo').encode('idna')

...

或：

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shcheklein@hostname:~$ export GEVENT_RESOLVER=ares
shcheklein@hostname:~$ gunicorn -w 1 -k gevent -t 5 --debug test:app

也许这个古尼康问题可以为您提供一些额外的信息和帮助。

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