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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 Tue, 30 Oct 2012 07:12:24 GMT

    [ https://issues.apache.org/jira/browse/HDFS-3980?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13486702#comment-13486702
] 

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

bq. i) Even If we configure IP, It should be resolved rite.(as I mentioned in defect, host-name
resolution should be done rite.).

I suppose we could perform reverse DNS on the configured fs.defaultFS, but I must admit that
I don't understand the use case for configuring an explicit IP address when the node in question
does indeed have an externally resolvable hostname that could be used.

bq. NPE,can we address NPE ?

I'm pretty sure that the NPE itself is actually a bug in the JDK. We might be able to check
for a specific Hadoop misconfiguration at a higher level so that we never reach the code that
will cause the NPE, but doing so in such a way that would cover all possible cases of this
NPE might prove difficult.
                
> 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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