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https://issues.apache.org/jira/browse/HADOOP-8565?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Alejandro Abdelnur resolved HADOOP-8565.
----------------------------------------

    Resolution: Duplicate

This is a dup of HADOOP-8355 (which I've missed to backport to branch-1, doing 
that now)
                
> AuthenticationFilter#doFilter warns unconditionally when using SPNEGO 
> ----------------------------------------------------------------------
>
>                 Key: HADOOP-8565
>                 URL: https://issues.apache.org/jira/browse/HADOOP-8565
>             Project: Hadoop Common
>          Issue Type: Improvement
>    Affects Versions: 1.0.3
>            Reporter: Eli Collins
>            Assignee: Alejandro Abdelnur
>
> The following code in AuthenticationFilter#doFilter throws 
> AuthenticationException (and warns) unconditionally because 
> KerberosAuthenticator#authenticate returns null if SPNEGO is used.
> {code}
>   token = authHandler.authenticate(httpRequest, httpResponse);
>   ...
>   if (token != null) { ... } else {
>     throw new AuthenticationException
>   }
> {code}

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