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Date: Thu, 7 Oct 2010 18:22:31 -0400 (EDT)
From: "Aaron T. Myers (JIRA)" <jira@apache.org>
To: common-issues@hadoop.apache.org
Subject: [jira] Commented: (HADOOP-6988) Add support for reading multiple
 hadoop delegation token files
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    [ https://issues.apache.org/jira/browse/HADOOP-6988?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12919082#action_12919082 ] 

Aaron T. Myers commented on HADOOP-6988:
----------------------------------------

Even if it's not intended for job submission, it's documented as being the preferred way to pass token files to bin/hadoop for the purpose of running HDFS commands.

>From the HDFS user guide:

{quote}
The HDFS fetchdt command is not a Hadoop shell command. It can be run as 'bin/hadoop fetchdt DTfile'. After you got the token you can run an HDFS command without having Kerberos tickets, by pointing HADOOP_TOKEN_FILE_LOCATION environmental variable to the delegation token file.
{quote}

Thus, this change could be useful for any HDFS command which is capable of communicating with multiple distinct NNs.

> Add support for reading multiple hadoop delegation token files
> --------------------------------------------------------------
>
>                 Key: HADOOP-6988
>                 URL: https://issues.apache.org/jira/browse/HADOOP-6988
>             Project: Hadoop Common
>          Issue Type: Improvement
>          Components: security
>    Affects Versions: 0.22.0
>            Reporter: Aaron T. Myers
>            Assignee: Aaron T. Myers
>         Attachments: hadoop-6988.0.txt, hadoop-6988.1.txt
>
>
> It would be nice if there were a way to specify multiple delegation token files via the HADOOP_TOKEN_FILE_LOCATION environment variable and the "mapreduce.job.credentials.binary" configuration value. I suggest a colon-separated list of paths, each of which is read as a separate delegation token file.

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