title: How to install python packages in a Google Dataproc cluster
body: <p>Is it possible to install python packages in a Google Dataproc cluster after the cluster is created and running?</p>
  
  <p>I tried to use "<code>pip install xxxxxxx</code>" in the master command line but it does not seem to work.</p>
  
  <p>Google's Dataproc documentation does not mention this situation.</p>