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From "Karthik Kambatla (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-1098) Separate out RM services into "Always On" and "Active"
Date Fri, 30 Aug 2013 01:29:52 GMT

    [ https://issues.apache.org/jira/browse/YARN-1098?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13754291#comment-13754291
] 

Karthik Kambatla commented on YARN-1098:
----------------------------------------

Spoke to Bikas and Vinod offline.

To begin with, AdminService is the only "Always On" service. All others go into "Active" services.
As the external services become aware of HA, we move them to the "Always On" group. Standby
group can be created when needed.
                
> 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-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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