title: Hbase quickly count number of rows
body: <p>Right now I implement row count over <code>ResultScanner</code> like this</p>
  
  <pre><code>for (Result rs = scanner.next(); rs != null; rs = scanner.next()) {
      number++;
  }
  </code></pre>
  
  <p>If data reaching millions time computing is large.I want to compute in real time that i don't want to use Mapreduce</p>
  
  <p>How to quickly count number of rows.</p>