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Things todo while Recreating the cluster:

*Stop all the services on all the nodes(including ganglia and nagios)
*It is also a good practice to delete the rpms from all nodes.
search for the rpms:
rpm -qa |grep ganglia
rpm -qa |grep oozie
rpm -qa |grep sqoop
rpm -qa |grep pig
rpm -qa |grep nagios
rpm -qa |grep hadoop
and remove them :
rpm -e <package name>