title: hive slow performance with this configuration
body: <p>When i add this configuration command in hive-site.xml ,hive queries is very slow.<br>
  Anyone can explain why happened for me?how can we fix it?</p>
  
  <pre><code>&lt;property&gt;
  &lt;name&gt;hive.support.concurrency&lt;/name&gt;
  &lt;value&gt;true&lt;/value&gt;
  &lt;/property&gt;
  </code></pre>
  
  <p>this is my hive-site.xml:<br></p>
  
  <pre><code>&lt;configuration&gt;
  &lt;property&gt;
  &lt;name&gt;javax.jdo.option.ConnectionUserName&lt;/name&gt;
  &lt;value&gt;root&lt;/value&gt;
  &lt;description&gt;Username to use against metastore database&lt;/description&gt;
  &lt;/property&gt;
  &lt;property&gt;
  &lt;name&gt;javax.jdo.option.ConnectionPassword&lt;/name&gt;
  &lt;value&gt;&lt;/value&gt;
  &lt;description&gt;Username to use against metastore database&lt;/description&gt;
  &lt;/property&gt;
  &lt;property&gt;
  &lt;name&gt;hive.exec.dynamic.partition.mode&lt;/name&gt;
  &lt;value&gt;nonstrict&lt;/value&gt;
  &lt;/property&gt;
  property&gt;
  &lt;name&gt;hive.enforce.bucketing&lt;/name&gt;
  &lt;value&gt;true&lt;/value&gt;
  &lt;/property&gt;
  </code></pre>