title: cassandra count (*) query error OperationTimedOut: errors={}, last_host=127.0.0.1?
body: <p>when there is too many rows in cassandra table and I run following query in cqlsh:</p>
  
  <pre><code>select count(*) from tableA 
  </code></pre>
  
  <p>i get this error:</p>
  
  <pre><code>OperationTimedOut: errors={}, last_host=127.0.0.1
  </code></pre>
  
  <p>how can i resolve this error?</p>