Major Description
Many test jobs such as testmapredsort, TestDFSIO and nnbench try to write to HDFS under root.
If a user 'X' brings up the cluster and gives full access to user 'Y' under /user/Y, user Y's test jobs still will not run because they demand access to / which cannot be granted. Such jobs should be modified to write their temp outputs under /user/Y and not directly under /