Hi,
I suggest:
1. Making sure that the various command lines (hdfs, hive, spark-shellโฆ) work correctly from the node where Dataiku is installed. If not, it is a Hadoop configuration problem, so you should ask your Hadoop administrator or Cloudera support.
2. If it works on the command line but not in Dataiku DSS, perform a DSS diagnostic (in Administration > Maintenance) and send the result to Dataiku support http://support.dataiku.com/ along with a precise description of what doesn't work.