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Posted to yarn-issues@hadoop.apache.org by "Karthik Kambatla (JIRA)" <ji...@apache.org> on 2013/08/30 03:29:52 UTC
[jira] [Commented] (YARN-1098) Separate out RM services into
"Always On" and "Active"
[ 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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