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From "Josh Elser (JIRA)" <>
Subject [jira] [Commented] (ACCUMULO-3513) Ensure MapReduce functionality with Kerberos enabled
Date Wed, 04 Feb 2015 22:56:35 GMT


Josh Elser commented on ACCUMULO-3513:

bq. Ugh, I missed that. Sorry. Now you need to grant YARN setuid privileges. That's... unfortunate.
I suppose you also have to make assumptions about which UID you need to use, based on the
content of the delegation token, too, and I guess there's no guarantee that this will even
be the same on every node, or match the submitter's UID. (Though, presumably, they will all
be the same if using some common login service, like AD on all the nodes.)

Yes, it is a pain to get YARN set up in secure mode (notably setuid stuff), but it is well
written out what you need to do. It's also a stated YARN assumption that the user must exist
on every node.

> Ensure MapReduce functionality with Kerberos enabled
> ----------------------------------------------------
>                 Key: ACCUMULO-3513
>                 URL:
>             Project: Accumulo
>          Issue Type: Bug
>          Components: client
>            Reporter: Josh Elser
>            Assignee: Josh Elser
>            Priority: Blocker
>             Fix For: 1.7.0
>         Attachments: ACCUMULO-3513-design.pdf
> 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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