title: java.lang.NoClassDefFoundError: org/apache/hadoop/security/authorize/RefreshAuthorizationPolicyProtocol
body: <p>I am currently trying to install hadoop 2.3.0 on my cluster. However, when I run command "bin/hdfs namenode -format", I got this error:<br>
  Exception in thread "main" java.lang.NoClassDefFoundError: org/apache/hadoop/security/authorize/RefreshAuthorizationPolicyProtocol</p>
  
  <p>Caused by: java.lang.ClassNotFoundException: org.apache.hadoop.security.authorize.RefreshAuthorizationPolicyProtocol</p>
  
  <p>Any ideas how to solve it?</p>