3.3. 3. Deploy Hue with an HA Cluster

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

Install the Hadoop HttpFS component on the Hue server.
For RHEL/CentOS/Oracle Linux:
```
yum install hadoop-httpfs
```
For SLES:
```
yum install hadoop-httpfs
```
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
Configure the HttpFS service script for use by setting up the symlink in /etc/init.d:
> ln -s /usr/hdp/{$VERSION $BUILD}/hadoop-httpfs/etc/rc.d/init.d/hadoop-httpfs /etc/init.d/hadoop-httpfs
For example, {HDP2.2.x version number} could be 2.2.4.0-2913.

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>

Start the HttpFS service.
```
service hadoop-httpfs start 
```
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>
```

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/

Restart Hue for the changes to take effect.
```
service hue restart
```

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