我正在使用:
- Python 3.4.2
- PyMongo 3.0.2
- 运行 mongod 2.6.9 的 mongolab
- uWSGI 2.0.10
- CherryPy 3.7.0
- nginx 1.6.2
uWSGI 启动参数:
--socket 127.0.0.1:8081 --daemonize --enable-threads --threads 2 --processes 2
我只设置了一次MongoClient:
self.mongo_client = MongoClient('mongodb://user:pw@host.mongolab.com:port/mydb')
self.db = self.mongo_client['mydb']
我尝试将一个JSON字典保存到MongoDB:
result = self.db.jobs.insert_one(job_dict)
它通过执行同一个代码路径到mongodb的单元测试来工作。然而,当我使用HTTP POST通过CherryPy和uWSGI执行时,我得到了这个:
pymongo.errors.ServerSelectionTimeoutError: No servers found yet
为什么在通过CherryPy和uWSGI运行时会出现这种行为?这也许是PyMongo 3中的新线程模型吗?
更新:
如果我使用CherryPy内置服务器而不是uWSGI和nginx运行,则insert_one()可以正常工作。
更新1/25 4:53 pm EST:
在PyMongo中添加了一些调试后,看起来topology._update_servers()知道server 'myserver-a.mongolab.com'的server_type = 2。但是,server_description.known_servers()对于server 'myserver.mongolab.com'具有server_type = 0
这导致以下堆栈跟踪:
result = self.db.jobs.insert_one(job_dict)
File "/usr/local/lib/python3.4/site-packages/pymongo/collection.py", line 466, in insert_one
with self._socket_for_writes() as sock_info:
File "/usr/local/lib/python3.4/contextlib.py", line 59, in __enter__
return next(self.gen)
File "/usr/local/lib/python3.4/site-packages/pymongo/mongo_client.py", line 663, in _get_socket
server = self._get_topology().select_server(selector)
File "/usr/local/lib/python3.4/site-packages/pymongo/topology.py", line 121, in select_server
address))
File "/usr/local/lib/python3.4/site-packages/pymongo/topology.py", line 97, in select_servers
self._error_message(selector))
pymongo.errors.ServerSelectionTimeoutError: No servers found yet