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From "Jason Lowe (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-3104) RM generates new AMRM tokens every heartbeat between rolling and activation
Date Tue, 03 Feb 2015 16:59:35 GMT

    [ https://issues.apache.org/jira/browse/YARN-3104?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14303577#comment-14303577
] 

Jason Lowe commented on YARN-3104:
----------------------------------

The test failure is unrelated, and it passes for me locally with this patch.  Appears to be
another instance of YARN-2483.

> RM generates new AMRM tokens every heartbeat between rolling and activation
> ---------------------------------------------------------------------------
>
>                 Key: YARN-3104
>                 URL: https://issues.apache.org/jira/browse/YARN-3104
>             Project: Hadoop YARN
>          Issue Type: Bug
>          Components: resourcemanager
>    Affects Versions: 2.6.0
>            Reporter: Jason Lowe
>            Assignee: Jason Lowe
>         Attachments: YARN-3104.001.patch, YARN-3104.002.patch, YARN-3104.003.patch
>
>
> When the RM rolls a new AMRM secret, it conveys this to the AMs when it notices they
are still connected with the old key.  However neither the RM nor the AM explicitly close
the connection or otherwise try to reconnect with the new secret.  Therefore the RM keeps
thinking the AM doesn't have the new token on every heartbeat and keeps sending new tokens
for the period between the key roll and the key activation.  Once activated the RM no longer
squawks in its logs about needing to generate a new token every heartbeat (i.e.: second) for
every app, but the apps can still be using the old token.  The token is only checked upon
connection to the RM.  The apps don't reconnect when sent a new token, and the RM doesn't
force them to reconnect by closing the connection.



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