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From "Jian He (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-941) RM Should have a way to update the tokens it has for a running application
Date Fri, 17 Oct 2014 18:24:34 GMT

    [ https://issues.apache.org/jira/browse/YARN-941?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14175342#comment-14175342
] 

Jian He commented on YARN-941:
------------------------------

Found an issue while testing long running service in secure mode.
In secure mode, YARN requires the hdfs-delegation token to do localization and log aggregation
on behalf of the user. But the hdfs delegation token will eventually expire after max-token-life-time.
So, localization and log aggregation will fail after the delegation token expires.  opened
YARN-2704 for this issue.

> RM Should have a way to update the tokens it has for a running application
> --------------------------------------------------------------------------
>
>                 Key: YARN-941
>                 URL: https://issues.apache.org/jira/browse/YARN-941
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>            Reporter: Robert Joseph Evans
>            Assignee: Xuan Gong
>         Attachments: YARN-941.preview.2.patch, YARN-941.preview.3.patch, YARN-941.preview.4.patch,
YARN-941.preview.patch
>
>
> When an application is submitted to the RM it includes with it a set of tokens that the
RM will renew on behalf of the application, that will be passed to the AM when the application
is launched, and will be used when launching the application to access HDFS to download files
on behalf of the application.
> For long lived applications/services these tokens can expire, and then the tokens that
the AM has will be invalid, and the tokens that the RM had will also not work to launch a
new AM.
> We need to provide an API that will allow the RM to replace the current tokens for this
application with a new set.  To avoid any real race issues, I think this API should be something
that the AM calls, so that the client can connect to the AM with a new set of tokens it got
using kerberos, then the AM can inform the RM of the new set of tokens and quickly update
its tokens internally to use these new ones.



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