Hadoop WebHDFS REST API disable default user

[#1]

I am running a pseudo-distributed hadoop system. When I put some data using a REST API to HDFS without setting user.name in a post request a default user dr.who is used.

The documentation says If the user.name parameter is not set, the server may either set the authenticated user to a default web user, if there is any, or return an error response.

How I can enforce the service to return an error response instead of using the default user. I am quite affraid that everybody can put whatever he wants as a default user.

[#2]

Well to be "fair" if you have not kerberos configured anyone can do anything using the API.

Since you just need to "tell" the API you are "HDFS" (without showing a proof of it) for doing whatever you want.