title: hbase NameError: uninitialized constant IS_MOB
body: <p>I am a user of hbase-0.98.18-hadoop2, when I try to create a table:</p>
  
  <pre><code>create 'MOBTable', {NAME =&gt; 'columFamily', VERSION =&gt; 1, IS_MOB =&gt; true, MOB_THRESHOLD =&gt; 102400}
  </code></pre>
  
  <p>there is an error:</p>
  
  <pre><code>NameError: uninitialized constant IS_MOB
  </code></pre>
  
  <p>But I have add the following line to hbase-site.xml:</p>
  
  <pre><code>&lt;property&gt;
    &lt;name&gt;hfile.format.version&lt;/name&gt;
    &lt;value&gt;3&lt;/value&gt;
  &lt;/property&gt;
  </code></pre>
  
  <p>in order to support Hfile version3.
  However the problem still exist.
  how can I solve this problem?</p>