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From "Daryn Sharp (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-2956) calling fetchdt without a --renewer argument throws NPE
Date Fri, 01 Jun 2012 22:24:24 GMT

    [ https://issues.apache.org/jira/browse/HDFS-2956?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13287738#comment-13287738

Daryn Sharp commented on HDFS-2956:

It's potentially more than a 1-liner.  The NN used to generate (apparently by design) a non-renewable
token if the renewer is null.  The PB stuff broke the ability to pass a null renewer.  OTOH,
the hftp servlet defaults the renewer to the client's UGI when passed a null renewer.

The quick and dirty answer is for the token fetcher to default the renewer to UGI's login
user unless the renewer flag is explicitly provided.  This breaks the ability to request a
non-renewable hdfs token, but as mentioned earlier, PB broke that anyway.

Or should the PB code be fixed to allow a null renewer once again, and perhaps for consistency
change hftp to not default a null renewer to the client's UGI?
> calling fetchdt without a --renewer argument throws NPE
> -------------------------------------------------------
>                 Key: HDFS-2956
>                 URL: https://issues.apache.org/jira/browse/HDFS-2956
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: security
>    Affects Versions: 0.24.0
>            Reporter: Todd Lipcon
>            Assignee: Daryn Sharp
> If I call "bin/hdfs fetchdt /tmp/mytoken" without a "--renewer foo" argument, then it
will throw a NullPointerException:
> Exception in thread "main" java.lang.NullPointerException
>         at org.apache.hadoop.hdfs.protocolPB.ClientNamenodeProtocolTranslatorPB.getDelegationToken(ClientNamenodeProtocolTranslatorPB.java:830)
> this is because getDelegationToken is being called with a null renewer

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