title: mongoDB mongoimport upsert
body: <p>I'm trying to do a bulk update with the following</p>
  
  <pre><code>mongoimport -d my_db -c db_collection -upsertFields email ~/Desktop/update_list.csv
  </code></pre>
  
  <p>the csv that i'm trying to import looks like this. </p>
  
  <pre><code>email, full_name
  stack@overflow.com,stackoverflow
  mongo@db.com,mongodb
  </code></pre>
  
  <p>It should check the email column as a query arg and update the full name accordingly. However, none were imported, it encountered errors.</p>
  
  <pre><code>exception:Failure parsing JSON string near: abc@sa
  abc@sasa.com,abc
  imported 0 objects
  encountered 99398 errors
  </code></pre>
  
  <p>Where is the problem? How should i be doing it?</p>