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Date: Wed, 4 Sep 2013 19:00:52 +0000 (UTC)
From: "Daryn Sharp (JIRA)" <jira@apache.org>
To: yarn-issues@hadoop.apache.org
Message-ID: <JIRA.12666928.1378314950678.79798.1378321252353@arcas>
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Subject: [jira] [Commented] (YARN-1146) RM DTSM and RMStateStore mismanage
 sequence number
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    [ https://issues.apache.org/jira/browse/YARN-1146?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13758184#comment-13758184 ] 

Daryn Sharp commented on YARN-1146:
-----------------------------------

[~vinodkv] I'm desynch'ing the ADTSM on HADOOP-9930.  Is it ok for me to exasperate this seq number handling?
                
> RM DTSM and RMStateStore mismanage sequence number
> --------------------------------------------------
>
>                 Key: YARN-1146
>                 URL: https://issues.apache.org/jira/browse/YARN-1146
>             Project: Hadoop YARN
>          Issue Type: Bug
>    Affects Versions: 2.0.0-alpha
>            Reporter: Daryn Sharp
>
> {{RMDelegationTokenSecretManager}} implements {{storeNewToken}} and {{updateStoredToken}} (renew) to pass the token and its sequence number to {{RMStateStore#storeRMDelegationTokenAndSequenceNumber}}.
> There are two problems:
> # The assumption is that new tokens will be synchronously stored in-order.  With an async secret manager this may not hold true and the state's sequence number may be incorrect.
> # A token renewal will reset the state's sequence number to _that token's_ sequence number.
> Bug #2 is generally masked.  Creating a new token (with the first caveat) will bump the state's sequence number back up.  Restoring the dtsm will first set the state's stored sequence number, then re-add all the tokens which will update the sequence number if the token's sequence number is greater than the dtsm's current sequence number.

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