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https://issues.apache.org/jira/browse/YARN-4006?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15295097#comment-15295097
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Allen Wittenauer commented on YARN-4006:
----------------------------------------

bq. if we don't really need AltKerberos here then we could set this to just be 
kerberos.

Two issues:

a) split configurations are a pain in the ass to manage
b) timeline server is expected to be used by end users for querying.  so if 
your altkerberos has, say, JWT support for end user applications....

> YARN ATS Alternate Kerberos HTTP Authentication Changes
> -------------------------------------------------------
>
>                 Key: YARN-4006
>                 URL: https://issues.apache.org/jira/browse/YARN-4006
>             Project: Hadoop YARN
>          Issue Type: Improvement
>          Components: security, timelineserver
>    Affects Versions: 2.5.0, 2.6.0, 2.7.0, 2.5.1, 2.6.1, 2.8.0, 2.7.1, 2.7.2
>            Reporter: Greg Senia
>            Assignee: Greg Senia
>            Priority: Blocker
>         Attachments: YARN-4006-branch-trunk.patch, 
> YARN-4006-branch2.6.0.patch, sample-ats-alt-auth.patch
>
>
> When attempting to use The Hadoop Alternate Authentication Classes. They do 
> not exactly work with what was built with YARN-1935.
> I went ahead and made the following changes to support using a Custom 
> AltKerberos DelegationToken custom class.
> Changes to: TimelineAuthenticationFilterInitializer.class
> {code}
>    String authType = filterConfig.get(AuthenticationFilter.AUTH_TYPE);
>     LOG.info("AuthType Configured: "+authType);
>     if (authType.equals(PseudoAuthenticationHandler.TYPE)) {
>       filterConfig.put(AuthenticationFilter.AUTH_TYPE,
>           PseudoDelegationTokenAuthenticationHandler.class.getName());
>         LOG.info("AuthType: PseudoDelegationTokenAuthenticationHandler");
>     } else if (authType.equals(KerberosAuthenticationHandler.TYPE) || 
> (UserGroupInformation.isSecurityEnabled() && 
> conf.get("hadoop.security.authentication").equals(KerberosAuthenticationHandler.TYPE)))
>  {
>       if (!(authType.equals(KerberosAuthenticationHandler.TYPE))) {
>         filterConfig.put(AuthenticationFilter.AUTH_TYPE,
>           authType);
>         LOG.info("AuthType: "+authType);
>       } else {
>         filterConfig.put(AuthenticationFilter.AUTH_TYPE,
>           KerberosDelegationTokenAuthenticationHandler.class.getName());
>         LOG.info("AuthType: KerberosDelegationTokenAuthenticationHandler");
>       } 
>       // Resolve _HOST into bind address
>       String bindAddress = conf.get(HttpServer2.BIND_ADDRESS);
>       String principal =
>           filterConfig.get(KerberosAuthenticationHandler.PRINCIPAL);
>       if (principal != null) {
>         try {
>           principal = SecurityUtil.getServerPrincipal(principal, bindAddress);
>         } catch (IOException ex) {
>           throw new RuntimeException(
>               "Could not resolve Kerberos principal name: " + ex.toString(), 
> ex);
>         }
>         filterConfig.put(KerberosAuthenticationHandler.PRINCIPAL,
>             principal);
>       }
>     }
>  {code}



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