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From "Karthik Kambatla (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-1029) Allow embedding leader election into the RM
Date Wed, 18 Dec 2013 18:12:08 GMT

    [ https://issues.apache.org/jira/browse/YARN-1029?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13851977#comment-13851977
] 

Karthik Kambatla commented on YARN-1029:
----------------------------------------

I am a little confused here - I am not sure if we have consensus on whether the patch posted
here is in the right direction and I should go ahead and incorporate comments to improve it
(unify zk configs, automatically set leader election configs) or if we would want to change
the fundamental approach of addressing this. 

Current patch summary:
# RM starts a service, RMZKActiveStandbyElector, when automatic failover is enabled and configured
to be embedded.
# RMZKActiveStandbyElector spawns a thread that participates in leader election through the
ActiveStandbyElector
# RMZKActiveStandbyElector implements ElectorCallBacks for transitioning the RM to active,
standby.
# AdminService and RMZKActiveStandbyElector implement ZKFCProtocol (a.ka. GracefulFailoverProtocol)
for graceful failover through "yarn rmadmin -failover rm1 rm2" (HAAdmin)
# TestRMFailover verifies both automatic failover and manual graceful failover

> Allow embedding leader election into the RM
> -------------------------------------------
>
>                 Key: YARN-1029
>                 URL: https://issues.apache.org/jira/browse/YARN-1029
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>            Reporter: Bikas Saha
>            Assignee: Karthik Kambatla
>         Attachments: embedded-zkfc-approach.patch, yarn-1029-0.patch, yarn-1029-0.patch,
yarn-1029-approach.patch
>
>
> It should be possible to embed common ActiveStandyElector into the RM such that ZooKeeper
based leader election and notification is in-built. In conjunction with a ZK state store,
this configuration will be a simple deployment option.



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