Wei-Chiu Chuang created HADOOP-12879:
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             Summary: Web authentication documentation is contradicting
                 Key: HADOOP-12879
                 URL: https://issues.apache.org/jira/browse/HADOOP-12879
             Project: Hadoop Common
          Issue Type: Bug
    Affects Versions: 3.0.0
            Reporter: Wei-Chiu Chuang


Hi, I noticed recently folks are really focusing on documentation. (Kudos to 
+[~ajisakaa], +[~brahmareddy], +[~iwasakims], +[~daisuke.kobayashi], +[~jzhuge] 
and more). 

I've been following Hadoop documentation to set up web UI authentication, but 
it seems to be contradicting between docs, for example, for web UI Kerberos 
keytab settings:

* in _Hadoop in Secure Mode_ (SecureMode.md), HDFS daemons have distinct web UI 
authentication configs, for example, for name node that's 
{{dfs.web.authentication.kerberos.keytab}},
* but in _Authentication for Hadoop HTTP web-consoles_ (HttpAuthentication.md), 
it mentions a Hadoop-wide config: 
{{hadoop.http.authentication.kerberos.keytab}}; 
* finally, in _Hadoop Auth, Java HTTP SPNEGO - Server Side 
Configuration_(Configuration.md), it says{{\[PREFIX.\]kerberos.principal}} 
should be used.

They all seem to mean one thing, but different configuration names. So it's a 
bit of confusing, or even contradicting to each other. Can we improve it?



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