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From "Robert Joseph Evans (JIRA)" <j...@apache.org>
Subject [jira] [Created] (YARN-941) RM Should have a way to update the tokens it has for a running application
Date Fri, 19 Jul 2013 19:04:49 GMT
Robert Joseph Evans created YARN-941:
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             Summary: 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


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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