错误记录 "MongoClient opened before fork. Create MongoClient "

mongodb+pool多进程，在启动时会有如下提示：

/home/kk/python3.6_kk/lib/python3.6/site-packages/pymongo/topology.py:145: UserWarning: MongoClient opened before fork. Create MongoClient with connect=False, or create client after forking. See PyMongo's documentation for details: http://api.mongodb.org/python/current/faq.html#pymongo-fork-safe>
"MongoClient opened before fork. Create MongoClient "
/home/kk/python3.6_kk/lib/python3.6/site-packages/pymongo/topology.py:145: UserWarning: MongoClient opened before fork. Create MongoClient with connect=False, or create client after forking. See PyMongo's documentation for details: http://api.mongodb.org/python/current/faq.html#pymongo-fork-safe>
"MongoClient opened before fork. Create MongoClient "
/home/kk/python3.6_kk/lib/python3.6/site-packages/pymongo/topology.py:145: UserWarning: MongoClient opened before fork. Create MongoClient with connect=False, or create client after forking. See PyMongo's documentation for details: http://api.mongodb.org/python/current/faq.html#pymongo-fork-safe>
"MongoClient opened before fork. Create MongoClient "
/home/kk/python3.6_kk/lib/python3.6/site-packages/pymongo/topology.py:145: UserWarning: MongoClient opened before fork. Create MongoClient with connect=False, or create client after forking. See PyMongo's documentation for details: http://api.mongodb.org/python/current/faq.html#pymongo-fork-safe>
"MongoClient opened before fork. Create MongoClient "

"MongoClient opened before fork. Create MongoClient "

只需要在数据库连接时  加上，connect=False

client=pymongo.MongoClient('localhost',27017,connect=False)

就可以了。