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From "Josh Elser (JIRA)" <>
Subject [jira] [Commented] (ACCUMULO-3513) Ensure MapReduce functionality with Kerberos enabled
Date Tue, 27 Jan 2015 23:08:34 GMT


Josh Elser commented on ACCUMULO-3513:

I'm still unclear of how you think this prevents unwanted impersonation from happening. For
mapreduce, the only time that we "know" who a client is happens when they submit the job.
We need to tie the fact that the client is who they say they are (from their kerberos credentials)
and construct a way to let node managers who no longer have any idea what the job-submitter's
credentials are (this is the notion of the delegation token from HDFS and others).

In your example, we would have to trust that each and every mapreduce job in the system is
going to "do the right thing" and not impersonate users they shouldn't which isn't sufficient
for a solution. We can do much better by taking the delegation token approach.

> 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
> 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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