title: upserting mongoDB collection with CSV file
body: <p>i have one mongoDB collection which have follwing value</p>
  
  <pre><code>        lat    long   band1
         23.454  56.454  67
  </code></pre>
  
  <p>i want to updated that collection so that i get follwing collection</p>
  
  <pre><code>      lat     long    band1  band2
        23.454  56.454  67      73
  </code></pre>
  
  <p>csv which i want to use for update is  contains</p>
  
  <pre><code>  34.656,87.7565 ,78
  </code></pre>
  
  <p>size of this csv is 5gb </p>
  
  <p>I'm using follwing commands to updated collection</p>
  
  <pre><code> mongoimport --db test --collection nct_test --upsert --upsertFields band2 --file gdalexportedb8.csv
  </code></pre>
  
  <p>but I'm getting follwing error..</p>
  
  <pre><code>    Failed: error processing document #2: invalid character ',' looking for beginning of value
  </code></pre>
  
  <p>I want to know this is the right way or not and can anybody help me in this..</p>