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From "Aaron T. Myers (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-3980) NPE in HttpURLConnection.java while starting SecondaryNameNode.
Date Wed, 17 Oct 2012 00:36:03 GMT

    [ https://issues.apache.org/jira/browse/HDFS-3980?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13477495#comment-13477495
] 

Aaron T. Myers commented on HDFS-3980:
--------------------------------------

Hi Brahma, can you tell me exactly what you did to generate the keytab in question? It's unfortunately
quite easy to accidentally invalidate a keytab for a given principal if you later export another
keytab including entries for the same principal.

The fact that servicePrincipal is null is interesting, and I would guess that it's due to
having not properly configured the relevant principal setting in your configs. One things
confuses me, however: I can't find the method KerberosUtil#getWebDfsPrincipalAndReset in any
version of Hadoop that I'm aware of. What exact version are you experiencing this with?
                
> NPE in HttpURLConnection.java while starting SecondaryNameNode.
> ---------------------------------------------------------------
>
>                 Key: HDFS-3980
>                 URL: https://issues.apache.org/jira/browse/HDFS-3980
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: security
>    Affects Versions: 3.0.0, 2.0.1-alpha
>            Reporter: Brahma Reddy Battula
>            Priority: Critical
>         Attachments: core-site.xml, hdfs-site.xml
>
>
> Scenario:
> ========
> I started secure cluster by going thru following..
> https://ccp.cloudera.com/display/CDHDOC/CDH3+Security+Guide..
> Here SecondaryNamenode is getting shutdown by throwing NPE..
> Please correct me If I am wrong...
> Will attach conf and logs..

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