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From "Christopher Tubbs (JIRA)" <>
Subject [jira] [Commented] (ACCUMULO-3513) Ensure MapReduce functionality with Kerberos enabled
Date Fri, 30 Jan 2015 22:57:34 GMT


Christopher Tubbs commented on ACCUMULO-3513:

A few questions/comments about this plan:

# Regarding DIGEST-MD5, which transport features would it support, and how do these relate
to the auth, auth-int, and auth-conf options currently available with GSSAPI?
# Wouldn't it be better to keep the existing GSSAPI transport, and pass the delegation tokens
on top of that layer? That way, we authenticate the middle-man, too, and not just the end
user. With the DIGEST-MD5 implementation, and skipping authentication for the middle-man,
we cannot trust that the middle-man (the NodeManager?) is managing clients delegation tokens
properly from only the RPC connection.
# Regarding the use of ZK to propagate the rolling shared secret, we'd need to be careful
about propagation delays using the watchers to update the cache. Rather than user the watchers.
# Regarding the rolling secret: this seems like it would make client tokens vary in their
duration, and the expiration outside the control of the client user.
# Instead of relying on the master, you could make it possible for any TServer to grant a
delegation token. The resulting token could only be checked by that same TServer, but you
wouldn't have to rely on a SPOF or worry about propagation. Clients would randomly choose
a TServer to authenticate to, every time it needs a delegation token, and the delegation token
remembers who issued it.

> 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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