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From "Akira AJISAKA (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-2956) calling fetchdt without a --renewer argument throws NPE
Date Thu, 09 Jul 2015 05:30:05 GMT

    [ https://issues.apache.org/jira/browse/HDFS-2956?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14619929#comment-14619929
] 

Akira AJISAKA commented on HDFS-2956:
-------------------------------------

Hi [~vinayrpet], thank you for taking this issue. My concern is, when passing empty string
renewer to a request, the request will fail under any condition. If the concern is true, it's
better to fail fast by checking if {{--renewer}} argument exists in {{DelegationTokenFetcher#main}}.

> 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: 2.0.0-alpha, 3.0.0
>            Reporter: Todd Lipcon
>            Assignee: Vinayakumar B
>              Labels: BB2015-05-TBR
>         Attachments: HDFS-2956-01.patch, HDFS-2956.patch
>
>
> 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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