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Date: Wed, 4 Sep 2013 20:40:53 +0000 (UTC)
From: "Bikas Saha (JIRA)" <jira@apache.org>
To: yarn-issues@hadoop.apache.org
Message-ID: <JIRA.12665566.1377541733981.80546.1378327253520@arcas>
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Subject: [jira] [Commented] (YARN-1098) Separate out RM services into
 "Always On" and "Active"
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    [ https://issues.apache.org/jira/browse/YARN-1098?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13758308#comment-13758308 ] 

Bikas Saha commented on YARN-1098:
----------------------------------

Not a big fan of anonymous classes. We should probably create an ActiveServices that extends CompositeService. We can later add transitionToActive() and transitionToStandby() method to this object.

Dispatcher can actually also go into ActiveServices for now. We can move it into the main service later on because it looks like that the HAProtocol service will be the only always on service to start with.

Jenkins is not happy with the patch.


> Separate out RM services into "Always On" and "Active"
> ------------------------------------------------------
>
>                 Key: YARN-1098
>                 URL: https://issues.apache.org/jira/browse/YARN-1098
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>          Components: resourcemanager
>    Affects Versions: 2.1.0-beta
>            Reporter: Karthik Kambatla
>            Assignee: Karthik Kambatla
>              Labels: ha
>         Attachments: yarn-1098-1.patch, yarn-1098-approach.patch, yarn-1098-approach.patch
>
>
> From discussion on YARN-1027, it makes sense to separate out services that are stateful and stateless. The stateless services can  run perennially irrespective of whether the RM is in Active/Standby state, while the stateful services need to  be started on transitionToActive() and completely shutdown on transitionToStandby().
> The external-facing stateless services should respond to the client/AM/NM requests depending on whether the RM is Active/Standby.

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