Python Tornado:如何为多个请求共享pymongo连接?
我想为多个请求共享MongoDB连接。这就是我现在拥有的,但看起来它正在为每个请求创建一个新的连接Python Tornado:如何为多个请求共享pymongo连接?,python,mongodb,tornado,pymongo,Python,Mongodb,Tornado,Pymongo,我想为多个请求共享MongoDB连接。这就是我现在拥有的,但看起来它正在为每个请求创建一个新的连接 dbasync = asyncmongo.Client(pool_id='mydb', host='127.0.0.1', port=27017, maxcached=10, maxconnections=50, dbname='bench') @route('/readAsync') class ReadAllAsynchHandler(tornado.web.RequestHandler):
dbasync = asyncmongo.Client(pool_id='mydb', host='127.0.0.1', port=27017, maxcached=10, maxconnections=50, dbname='bench')
@route('/readAsync')
class ReadAllAsynchHandler(tornado.web.RequestHandler):
@tornado.web.asynchronous
def get(self):
print("getting sessions")
dbasync["ss"].find({}, callback=self._on_response)
def _on_response(self, response, error):
print("on response: %s" % response)
if error:
raise tornado.web.HTTPError(500)
self.finish(SS_TEMPLATE.generate(sessions=response))
在对1000个并发客户端进行基准测试时,我会遇到以下错误:
Traceback (most recent call last):
File "/home/ubuntu/envs/myproj/local/lib/python2.7/site-packages/tornado/web.py", line 1115, in _stack_context_handle_exception
raise_exc_info((type, value, traceback))
File "/home/ubuntu/envs/myproj/local/lib/python2.7/site-packages/tornado/web.py", line 1298, in wrapper
result = method(self, *args, **kwargs)
File "bench.py", line 29, in get
dbasync["ss"].find({}, callback=self._on_response)
File "/home/ubuntu/envs/myproj/local/lib/python2.7/site-packages/asyncmongo/cursor.py", line 380, in find
connection = self.__pool.connection()
File "/home/ubuntu/envs/myproj/local/lib/python2.7/site-packages/asyncmongo/pool.py", line 116, in connection
raise TooManyConnections("%d connections are already equal to the max: %d" % (self._connections, self._maxconnections))
TooManyConnections: 50 connections are already equal to the max: 50
DEBUG:root:dropping connection. connection pool (10) is full. maxcached 10
maxconnections
参数不用于缓冲现有连接池重用的请求。相反,它的存在只是为了确保,如果需要的话,您的应用程序不会消耗无限量的资源。有关此行为的更多讨论,请参阅。这个拉请求似乎提供了您想要的行为。您可以使用以下内容安装asyncmongo及其修订版:
pip install git+git://github.com/ceymard/asyncmongo.git@7a8e6f6f446d71f8fd4f17de48994c0b6bee72ee
或者,您可以在Tornado设置中的某个位置或通过nginx(例如,请参阅HttpLimitConnModule)限制应用程序的并发连接数