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https://issues.apache.org/jira/browse/YARN-5685?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15784070#comment-15784070
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Daniel Templeton commented on YARN-5685:
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I would look at it the other way around. The default assumption should be
embedded leader election. If an out-of-process election is added, it will be
the new and different thing, and it should then have a config param that
enables it. Today with no alternative, having a config param for embedded
makes no sense. The two options are: cluster works and cluster broken.
If you're really convinced that leadership election is something that will
change again soon, then I'd still deprecate the embedded option and add a new
option that selects the election type: "embedded" or "external", with the
"external" value only added once that's actually a thing. Heck, throw in
"manual" as a valid value, and we can also deprecate the config param to enable
automatic failover.
> Non-embedded HA failover is broken
> ----------------------------------
>
> Key: YARN-5685
> URL: https://issues.apache.org/jira/browse/YARN-5685
> Project: Hadoop YARN
> Issue Type: Bug
> Components: resourcemanager
> Affects Versions: 2.9.0, 3.0.0-alpha1
> Reporter: Daniel Templeton
> Assignee: Daniel Templeton
> Priority: Critical
> Labels: oct16-hard
> Attachments: YARN-5685.001.patch, YARN-5685.002.patch
>
>
> If HA is enabled with automatic failover enabled and embedded failover
> disabled, all RMs all come up in standby state. To make one of them active,
> the {{--forcemanual}} flag must be used when manually triggering the state
> change. Should the active go down, the standby will not become active and
> must be manually transitioned with the {{--forcemanual}} flag.
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