sunilcsc,

It is possible to create a cluster with java 8 through Director.

The Deployment (CM) must be created with javaInstallationStrategy set to NONE. This setting tells CM not to install java on the CDH hosts. This property is not exposed through the UI so you need to create the cluster using a conf file.

...
cloudera-manager {
   ...
   javaInstallationStrategy: NONE
   ...
}
...

Java 8 needs to be installed on each instance using a bootstrap script.

Here is an example bootstrap script you can use as a starting point. It removes openjdk, downloads a java 8 rpm, and installs it.

#!/bin/sh

yum remove --assumeyes *openjdk*
yum install --assumeyes wget
cd /opt
wget --no-cookies --no-check-certificate --header "Cookie: gpw_e24=http%3A%2F%2Fwww.oracle.com%2F; oraclelicense=accept-securebackup-cookie" "http://download.oracle.com/otn-pub/java/jdk/8u45-b14/jdk-8u45-linux-x64.rpm"
yum install --assumeyes /opt/jdk-8u45-linux-x64.rpm