Deploying Hue with an HA Cluster

If you are going to use Hue with an HA Cluster, make changes to /etc/hue/conf/hue.ini file.

1. Install the Hadoop HttpFS component on the Hue server.

   For RHEL/CentOS/Oracle Linux:

   yum install hadoop-httpfs

   For SLES:

   zypper install hadoop-httpfs

2. Modify /etc/hadoop-httpfs/conf/httpfs-env.sh to add the JDK path. In the file, ensure that JAVA_HOME is set:
   export JAVA_HOME=/usr/jdk64/jdk1.7.0_67
3. Configure the HttpFS service script by setting up the symlink in /etc/init.d:

   > ln -s /usr/hdp/{HDP2.4.x version number}
   /hadoop-httpfs/etc/rc.d/init.d/hadoop-httpfs /etc/init.d/hadoop-httpfs

4. Modify /etc/hadoop-httpfs/conf/httpfs-site.xml to configure HttpFS to talk to the cluster, by confirming that the following properties are correct:

   <property>
    <name>httpfs.proxyuser.hue.hosts</name>
    <value>*</value>
   </property>
   
   <property>
    <name>httpfs.proxyuser.hue.groups</name>
    <value>*</value>
   </property>

5. Start the HttpFS service.

   service hadoop-httpfs start 

6. Modify the core-site.xml file. On the NameNodes and all the DataNodes, add the following properties to the $HADOOP_CONF_DIR /core-site.xml file, where $HADOOP_CONF_DIR is the directory for storing the Hadoop configuration files. For example, /etc/hadoop/conf.

   <property>
    <name>hadoop.proxyuser.httpfs.groups</name>
    <value>*</value>
   </property>
   
   <property>
    <name>hadoop.proxyuser.httpfs.hosts</name>
    <value>*</value>
   </property>

7. In the hue.ini file, under the [hadoop][[hdfs_clusters]][[[default]]] subsection, use the following variables to configure the cluster:

   Property	Description	Example
   fs_defaultfs	NameNode URL using the logical name for the new name service. For reference, this is the dfs.nameservices property in hdfs-site.xml in your Hadoop configuration.	hdfs://mycluster
   webhdfs_url	URL to the HttpFS server.	http://c6401.apache.org:14000/ webhdfs/v1/

8. Restart Hue for the changes to take effect.

   service hue restart