title: Cassandra write consistency level ALL clarification
body: <p>According to Datastax <a href="https://docs.datastax.com/en/cassandra/3.0/cassandra/dml/dmlClientRequestsWrite.html" rel="nofollow noreferrer">documentation for Cassandra</a>:</p>
  
  <p>"If the coordinator cannot write to enough replicas to meet the requested consistency level, it throws an Unavailable Exception and does not perform any writes."</p>
  
  <p>Does this mean that while the write is in process, the data updated by the write will not be available to read requests? I mean it is possible that 4/5 nodes have successfully sent a SUCCESS to the coordinator, meaning that their data have been updated. But the 5th one is yet to do the write. Now if a read request comes in and goes to one of these 4 nodes, it will still show the old data until the coordinator recieves a confirmation from the 5th node and marks the new data valid?</p>