title: Apache NiFi : How to fetch data from Cassandra table whenever table record is getting modified
body: <p>I have <strong>Cassandra</strong> as the database, We are using "<strong>QueryCassandra</strong>" processor to fetch values from Cassandra table to an output port,
  Which uses a select query to fetch the records. I have a use case mentioned below.</p>
  
  <p>1) First time all the records need to be <strong>fetched from Cassandra and transferred to the output port</strong>, that's happening now. (i.e  All data is frequently fetched from the table at particular time interval as we mention in Run Schedule)</p>
  
  <p>2) Later whenever the Cassandra table is modified (Insert New Record or Row Updated or Row delete) then only the records need to be sent to the output port, 
  is there any way we can achieve this instead of fetching every time intervals?</p>
  
  <p><a href="https://i.stack.imgur.com/Zogre.png" rel="nofollow noreferrer">Sample Nifi Template</a></p>