title: How to source data from multiple collection in DocumentDB to Hadoop
body: <p>I'm having a hadoop job which sources data from multiple DocumentDB collection. While configuring the connection with DocumentDB I can set <code>INOUT_COLLECTION_NAMES</code> using the following comand</p>
  
  <pre><code> conf.set(ConfigurationUtil.INPUT_COLLECTION_NAMES, inputCollName);
  </code></pre>
  
  <p>My question is what if I have more than just one collection?What if I don't know how many collections I have in advance? </p>