Xiaoyu Yao created HADOOP-13520:
-----------------------------------

             Summary: Document HADOOP-10158 for multi home/SPN support of HTTP 
principles
                 Key: HADOOP-13520
                 URL: https://issues.apache.org/jira/browse/HADOOP-13520
             Project: Hadoop Common
          Issue Type: Improvement
            Reporter: Xiaoyu Yao
            Assignee: Xiaoyu Yao


With HADOOP-10158, it is possible to load multiple principal names or all HTTP 
principals in the key tab by specifying “*” for multi home/realm scenarios 
where multiple SPNs exist for HTTP. 

This ticket is opened to 

1) Document the newly supported option * for HTTP principles such as 
hadoop.http.authentication.kerberos.principal.  

2) Change the hadoop.http.authentication.kerberos.principal in core-default.xml 
from 
{code}
<property>
  <name>hadoop.http.authentication.kerberos.principal</name>
  <value>HTTP/_HOST@LOCALHOST</value>
  <description>
    Indicates the Kerberos principal to be used for HTTP endpoint.
    The principal MUST start with 'HTTP/' as per Kerberos HTTP SPNEGO 
specification.
  </description>
</property>
{code}

to save one more configuration key needed.
{code}
<property>
  <name>hadoop.http.authentication.kerberos.principal</name>
  <value>*</value>
  <description>
    Indicates using all the Kerberos principals from 
hadoop.http.authentication.kerberos.keytab for Kerberos HTTP SPNEGO 
authentication, which is needed for multiple interface/SPN scenarios.
  </description>
</property>
{code}



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