[jira] [Commented] (HADOOP-13005) if local hostname doesn't resolve, HttpServer2 fails with a kerberos exception

["Andrew K Long (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HADOOP-13005?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16688678#comment-16688678 ] 

Andrew K Long commented on HADOOP-13005:
----------------------------------------

I ran into this as well while setting up my dev environment on OSX.  I was able to fix this by editing my /etc/hosts file to include the domain name.  

> if local hostname doesn't resolve, HttpServer2 fails with a kerberos exception
> ------------------------------------------------------------------------------
>
>                 Key: HADOOP-13005
>                 URL: https://issues.apache.org/jira/browse/HADOOP-13005
>             Project: Hadoop Common
>          Issue Type: Bug
>          Components: net
>    Affects Versions: 2.7.2
>         Environment: a VM whose hostname was no longer in /etc/hosts
>            Reporter: Steve Loughran
>            Priority: Minor
>
> When a service (NN, DN) is started and the local hostname isn't in /etc/hosts, things will, obviously, fail.
> However, the failure is reported as a wrapped Kerberos Exception, rather than going via the NetUtils.wrapException handling code {{java.lang.RuntimeException: Could not resolve Kerberos principal name: java.net.UnknownHostException: xubunty: xubunty: unknown error}}
> The text is a dangerous distraction from the real cause. Especially as it appears even on systems which aren't running kerberos.
> A fail-fast check could go into the http server startup process ahead of the security setup; NetUtils could add special reporting of the unknown-local-host problem



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