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From "Christopher Tubbs (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (ACCUMULO-3513) Ensure MapReduce functionality with Kerberos enabled
Date Wed, 28 Jan 2015 03:43:34 GMT

    [ https://issues.apache.org/jira/browse/ACCUMULO-3513?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14294673#comment-14294673
] 

Christopher Tubbs commented on ACCUMULO-3513:
---------------------------------------------

No, the yarn user still has to use its own Kerberos credentials to set up the transport layer
with Accumulo. It may be acting on behalf of a user, but it still needs to authenticate to
Accumulo as itself first. See below.

> Ensure MapReduce functionality with Kerberos enabled
> ----------------------------------------------------
>
>                 Key: ACCUMULO-3513
>                 URL: https://issues.apache.org/jira/browse/ACCUMULO-3513
>             Project: Accumulo
>          Issue Type: Bug
>          Components: client
>            Reporter: Josh Elser
>            Assignee: Josh Elser
>            Priority: Blocker
>             Fix For: 1.7.0
>
>
> I talked to [~devaraj] today about MapReduce support running on secure Hadoop to help
get a picture about what extra might be needed to make this work.
> Generally, in Hadoop and HBase, the client must have valid credentials to submit a job,
then the notion of delegation tokens is used by for further communication since the servers
do not have access to the client's sensitive information. A centralized service manages creation
of a delegation token which is a record which contains certain information (such as the submitting
user name) necessary to securely identify the holder of the delegation token.
> The general idea is that we would need to build support into the master to manage delegation
tokens to node managers to acquire and use to run jobs. Hadoop and HBase both contain code
which implements this general idea, but we will need to apply them Accumulo and verify that
it is M/R jobs still work on a kerberized environment.



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