title: Overwrite row in cassandra with INSERT, will it cause tombstone?
body: <p>Writing data to Cassandra without causing it to create tombstones are vital in our case, due to the amount of data and speed. Currently we have only written a row once, and then never had the need to update the row again, only fetch the data again.</p>
  
  <p>Now there has been a case, where we actually need to write data, and then complete it with more data, that is finished after awhile.
  It can be made by either;</p>
  
  <ol>
  <li><p>overwrite all of the data in a row again using INSERT (all data is available), or</p></li>
  <li><p>performing an Update only on the new data.</p></li>
  </ol>
  
  <p>What is the best way to do it, bear in mind of the speed and not creating a tombstone is of importance ?</p>