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Date: Thu, 5 Oct 2017 00:39:00 +0000 (UTC)
From: "Robert Kanter (JIRA)" <jira@apache.org>
To: yarn-issues@hadoop.apache.org
Message-ID: <JIRA.13105566.1506545913000.275826.1507163940261@Atlassian.JIRA>
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Subject: [jira] [Updated] (YARN-7262) Add a hierarchy into the
 ZKRMStateStore for delegation token znodes to prevent jute buffer overflow
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archived-at: Thu, 05 Oct 2017 00:39:05 -0000


     [ https://issues.apache.org/jira/browse/YARN-7262?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Robert Kanter updated YARN-7262:
--------------------------------
    Target Version/s: 3.1.0  (was: 3.0.0)

> Add a hierarchy into the ZKRMStateStore for delegation token znodes to prevent jute buffer overflow
> ---------------------------------------------------------------------------------------------------
>
>                 Key: YARN-7262
>                 URL: https://issues.apache.org/jira/browse/YARN-7262
>             Project: Hadoop YARN
>          Issue Type: Improvement
>    Affects Versions: 2.6.0
>            Reporter: Robert Kanter
>            Assignee: Robert Kanter
>         Attachments: YARN-7262.001.patch, YARN-7262.002.patch
>
>
> We've seen users who are running into a problem where the RM is storing so many delegation tokens in the {{ZKRMStateStore}} that the _listing_ of those znodes is higher than the jute buffer. This is fine during operations, but becomes a problem on a fail over because the RM will try to read in all of the token znodes (i.e. call {{getChildren}} on the parent znode).  This is particularly bad because everything appears to be okay, but then if a failover occurs you end up with no active RMs.
> There was a similar problem with the Yarn application data that was fixed in YARN-2962 by adding a (configurable) hierarchy of znodes so the RM could pull subchildren without overflowing the jute buffer (though it's off by default).
> We should add a hierarchy similar to that of YARN-2962, but for the delegation token znodes.


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