title: How to avoid generating crc files and SUCCESS files while saving a DataFrame?
body: <p>I am using the following code to save a spark DataFrame to JSON file</p>
  
  <pre><code>unzipJSON.write.mode("append").json("/home/eranw/Workspace/JSON/output/unCompressedJson.json")
  </code></pre>
  
  <p>the output result is:</p>
  
  <pre><code>part-r-00000-704b5725-15ea-4705-b347-285a4b0e7fd8
  .part-r-00000-704b5725-15ea-4705-b347-285a4b0e7fd8.crc
  part-r-00001-704b5725-15ea-4705-b347-285a4b0e7fd8
  .part-r-00001-704b5725-15ea-4705-b347-285a4b0e7fd8.crc
  _SUCCESS
  ._SUCCESS.crc
  </code></pre>
  
  <ol>
  <li>How do I generate a single JSON file and not a file per line?</li>
  <li>How can I avoid the *crc files?</li>
  <li>How can I avoid the SUCCESS file?</li>
  </ol>