<param> <name>main.ldapRealm</name> <value>org.apache.hadoop.gateway.shirorealm.KnoxLdapRealm</value> </param> <param> <name>main.ldapContextFactory</name> <value>org.apache.hadoop.gateway.shirorealm.KnoxLdapContextFactory </value> </param> <param> <name>main.ldapRealm.contextFactory</name> <value>$ldapContextFactory</value> </param>