I just started playing with your VMWare based Quickstart VM. I find CDH very convenient to use. I'm using Clover ETL graph to write some data on to a file present in HDFS. When i use the "write to hdfs" component, the connectivity seems to be fine and i can see the file (text) present in hdfs via hue, the write operation is failing with the error:
File /tmp/bigdata_examples/key-value-pairs could only be replicated to 0 nodes instead of minReplication (=1). There are 1 datanode(s) running and 1 node(s) are excluded in this operation.
Please let me know if you require any additional details, thanks. I suspect this to be some sort of a permission related issue.