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https://issues.apache.org/jira/browse/YARN-4983?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15258960#comment-15258960
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Li Lu commented on YARN-4983:
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bq. One pedantic little comment: lest we work against YARN-4977, can we please
include a message on the throws tag in the javadoc headers?
Sure. I'll update that part.
bq. Also, it looks like the test tests the transition from active to standby,
but not back to active. Any value in adding that last step?
Not necessarily? The problem happens when we try to reinitialize the RM active
service. This step happens when we call transitionToStandBy. The actual symptom
also happens when the RM becomes standby from active.
> JVM and UGI metrics disappear after RM is once transitioned to standby mode
> ---------------------------------------------------------------------------
>
> Key: YARN-4983
> URL: https://issues.apache.org/jira/browse/YARN-4983
> Project: Hadoop YARN
> Issue Type: Bug
> Reporter: Li Lu
> Assignee: Li Lu
> Attachments: YARN-4983-trunk.000.patch, YARN-4983-trunk.001.patch,
> YARN-4983-trunk.002.patch
>
>
> When get transitioned to standby, the RM will shutdown the existing metric
> system and relaunch a new one. This will cause the jvm metrics and ugi
> metrics to miss in the new metric system.
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