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From "Bikas Saha (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-1027) Implement RMHAServiceProtocol
Date Sun, 04 Aug 2013 21:03:48 GMT

    [ https://issues.apache.org/jira/browse/YARN-1027?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13728992#comment-13728992
] 

Bikas Saha commented on YARN-1027:
----------------------------------

RMHAServiceProtocol may be a wrapper that does what main() currently does. Upon transitionToActive()
it instantiates and starts ResourceManager object and upon transitionToStandby() it stops
the ResourceManager object. Potential issues may occur in the stopping/shutdown logic in the
RM and how it interacts with the extra wrapping layer. Since RPC services are not up and listening,
clients may see long timeouts when connecting to standby RM's.

Alternatively, RMHAServiceProtocol can be added as another service in the RM. All services
may be started as they currently do. Modify RM  service startup logic to first start this
service and maybe other RPC services. The RMHAServiceProtocol service starts internal services
when it transitionToActive() and stops them when transitionToStandby().

Add haEnabled configuration which is false by default. When HA is off then RM is always started
in active state immediately. 
                
> Implement RMHAServiceProtocol
> -----------------------------
>
>                 Key: YARN-1027
>                 URL: https://issues.apache.org/jira/browse/YARN-1027
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>            Reporter: Bikas Saha
>
> Implement existing HAServiceProtocol from Hadoop common. This protocol is the single
point of interaction between the RM and HA clients/services.

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