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Date: Fri, 20 Jun 2014 22:14:26 +0000 (UTC)
From: "Sandy Ryza (JIRA)" <jira@apache.org>
To: yarn-issues@hadoop.apache.org
Message-ID: <JIRA.12658813.1374260608194.20690.1403302466377@arcas>
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References: <JIRA.12658813.1374260608194@arcas>
Subject: [jira] [Commented] (YARN-941) RM Should have a way to update the
 tokens it has for a running application
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    [ https://issues.apache.org/jira/browse/YARN-941?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14039446#comment-14039446 ] 

Sandy Ryza commented on YARN-941:
---------------------------------

Just to make sure we're not getting tripped up on terminology, I think everyone agrees on the continued need for token "renewal", which in Hadoop means extending the lifespan of an existing token.  The question is whether we should have a mechanism for token "replacement", or allow tokens to be renewed indefinitely.

> 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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