Allow HAProxy to be self-tuning for the parts of the stack installed
Allow keepalived's configuration file template to be parameterized
Namenode initialize-shared-edits should be done with NN stopped per the Hadoop 2.3.0 High Availability guide: "At this point you may start both of your HA NameNodes as you normally would start a NameNode."
Enable - HDFS-3703: Decrease the datanode failure detection time
For Graphite mysql nodes are synonymous with head nodes for both OpenStack and Hadoop clusters
Add in explict service supports for xinetd (reload is in use and supported)
Similarly, mysql and head nodes are synonymous for both Hadoop and OpenStack at this time
Necessary changes for Zabbix to install under both Hadoop and OpenStack clusters
Add zabbix, graphite, haproxy, keepalived to Hadoop stack