title: Cassandra - transaction support
body: <p>I am going through apache cassandra and working on sample data insertion, retrieving etc.</p>
  
  <p>The documentation is very limited.</p>
  
  <p>I am interested in knowing</p>
  
  <ul>
  <li>can we completely replace relation db like mysql/ oracle with cassandra?</li>
  <li>does cassandra support rollback/ commit?</li>
  <li>does cassandra clients (thrift/ hector) support fetching associated object (objects where we save one super columns' key in another super column family)?</li>
  </ul>
  
  <p>This will help me a lot to proceed further.</p>
  
  <p>thank you in advance.</p>