[
https://issues.apache.org/jira/browse/YARN-3021?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14272308#comment-14272308
]
Yongjun Zhang commented on YARN-3021:
-------------------------------------
HI [~qwertymaniac],
I looked at your patch, I think if we can be sure renewing an invalid token
will throw InvalidToken instead of IOException, then the fix would be good.
However, it seems to me that there is chance to get IOException. Comments?
If we can have a way to tell YARN not to renew a token, and the client either
wants to just to use the lifetime of the token, or the client can renew itself
before the job finish, that will solve the problem. One possible solution is
to add a new parameter when submitting a job, or ro add a field in the job
context.
Should we create a YARN jira to request this support? Seems to be a useful
infrastructure to have...
Thanks.
> YARN's delegation-token handling disallows certain trust setups to operate
> properly
> -----------------------------------------------------------------------------------
>
> Key: YARN-3021
> URL: https://issues.apache.org/jira/browse/YARN-3021
> Project: Hadoop YARN
> Issue Type: Bug
> Components: security
> Affects Versions: 2.3.0
> Reporter: Harsh J
> Attachments: YARN-3021.patch
>
>
> Consider this scenario of 3 realms: A, B and COMMON, where A trusts COMMON,
> and B trusts COMMON (one way trusts both), and both A and B run HDFS + YARN
> clusters.
> Now if one logs in with a COMMON credential, and runs a job on A's YARN that
> needs to access B's HDFS (such as a DistCp), the operation fails in the RM,
> as it attempts a renewDelegationToken(…) synchronously during application
> submission (to validate the managed token before it adds it to a scheduler
> for automatic renewal). The call obviously fails cause B realm will not trust
> A's credentials (here, the RM's principal is the renewer).
> In the 1.x JobTracker the same call is present, but it is done asynchronously
> and once the renewal attempt failed we simply ceased to schedule any further
> attempts of renewals, rather than fail the job immediately.
> We should change the logic such that we attempt the renewal but go easy on
> the failure and skip the scheduling alone, rather than bubble back an error
> to the client, failing the app submission. This way the old behaviour is
> retained.
--
This message was sent by Atlassian JIRA
(v6.3.4#6332)
