It's a normal, cause' you don't have access ownership & permission of that path.
The path, /tmp/ambari-qa, ownership & permission is ambari:hdfs:700.
That means is only access to the path by ambari-qa user include a sub-path (staging).
So you have to access another user such as nifi, you should acquire ambari-qa ownership or hdfs ownership not group.
I'm not recommend to change ownership or permission /tmp/../path, but if you using with only nifi user necessarily, then change the permission "755" of the path "/tmp/ambari-qa" and a sub-path by hdfs user or ambari-qa user.
