osg roll: Users Guide: 
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The following are short examples of how to customize Hadoop using Rocks commands.
Change default Hadoop Node Name on all compute Appliances: rocks set appliance attr compute OSG_HadoopNameNode value=hadoop-0-0
Change default Hadoop Secondary Name on all compute Appliances: rocks set appliance attr compute OSG_HadoopSecondaryNode value=hadoop-0-1
Change default Hadoop Data Dir on all compute Appliances, for example two data disks: rocks set appliance attr compute OSG_HadoopData value="/hadoop/data,/hadoop2/data"