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From "Li Lu (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-4983) JVM and UGI metrics disappear after RM is once transitioned to standby mode
Date Tue, 26 Apr 2016 21:27:12 GMT

    [ https://issues.apache.org/jira/browse/YARN-4983?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15258960#comment-15258960
] 

Li Lu commented on YARN-4983:
-----------------------------

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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