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Date: Thu, 17 Oct 2013 17:23:43 +0000 (UTC)
From: "Bikas Saha (JIRA)" <jira@apache.org>
To: yarn-issues@hadoop.apache.org
Message-ID: <JIRA.12673794.1381794575511.80912.1382030623316@arcas>
In-Reply-To: <JIRA.12673794.1381794575511@arcas>
References: <JIRA.12673794.1381794575511@arcas>
Subject: [jira] [Commented] (YARN-1307) Rethink znode structure for RM HA
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    [ https://issues.apache.org/jira/browse/YARN-1307?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13798122#comment-13798122 ] 

Bikas Saha commented on YARN-1307:
----------------------------------

Jira messed up the tree in previous comment. Here it is again.

{noformat}
ROOT_DIR_PATH
 |--- VERSION_INFO
 |--- RM_APP_ROOT
 |     |----- (#ApplicationId1)
 |     |        |----- (#ApplicationAttemptIds)
 |     |                 
 |     |----- (#ApplicationId2)
 |             |----- (#ApplicationAttemptIds)
 |      ,,,,
 |--- RM_DT_SECRET_MANAGER_ROOT
       |----- RMDTSequenceNumber
       |----- RMDelegationToken
{noformat}

> Rethink znode structure for RM HA
> ---------------------------------
>
>                 Key: YARN-1307
>                 URL: https://issues.apache.org/jira/browse/YARN-1307
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>          Components: resourcemanager
>            Reporter: Tsuyoshi OZAWA
>            Assignee: Tsuyoshi OZAWA
>
> Rethink for znode structure for RM HA is proposed in some JIRAs(YARN-659, YARN-1222). The motivation of this JIRA is quoted from Bikas' comment in YARN-1222:
> {quote}
> We should move to creating a node hierarchy for apps such that all znodes for an app are stored under an app znode instead of the app root znode. This will help in removeApplication and also in scaling better on ZK. The earlier code was written this way to ensure create/delete happens under a root znode for fencing. But given that we have moved to multi-operations globally, this isnt required anymore.
> {quote}


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