title: MongoClient opened before fork. Create MongoClient
body: <p>When I start some of my services, it reports such warnings and the services stop:</p>
  
  <pre><code>/usr/lib64/python2.6/site-packages/pymongo/topology.py:75: 
  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#using-pymongo-with-multiprocessing&gt;
  "MongoClient opened before fork. Create MongoClient "
  </code></pre>
  
  <p>However, the <code>MongoClient</code> has been using the parameter <code>connect=False</code>, as you can review the code below:</p>
  
  <pre class="lang-py prettyprint-override"><code>client = MongoClient(host, port, connect=False)
  </code></pre>
  
  <p>It is still not working. By the way, I have upgraded my pymongo version to 3.4.0. 
  Can someone give me some suggestions?</p>
  
  <p>Cheers,
  Kai</p>