title: Cassandra - cfstats and meaning of read/write latency
body: <pre><code>Read Latency: 0.10471324863883848 ms.
  Write Latency: 0.10803364485981308 ms.
  </code></pre>
  
  <p>What is the meaning of those values?</p>
  
  <ul>
  <li>Is this average time? </li>
  <li>What is timeline for this calculation? Time since last restart?</li>
  <li>Is it possible to reset Read/Write Latency (over JMX
  maybie)?</li>
  </ul>