Set up kerberos error for Hadoop

[ZongtianHou]

Hi,everyone:
I am setting up kerberos for Hadoop cluster, but when starting the datanode, 
the following error happened:
java.lang.RuntimeException: Cannot start secure DataNode without configuring 
either privileged resources or SASL RPC data transfer protection and SSL for 
HTTP.  Using privileged resources in combination with SASL RPC data transfer 
protection is not supported.
I have searched the internet for a while but still can’t solve the issue, does 
anyone have a clue?