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From "Li Lu (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (YARN-4983) JVM and UGI metrics disappear after RM is once transitioned to standby mode
Date Thu, 21 Apr 2016 21:28:12 GMT

     [ https://issues.apache.org/jira/browse/YARN-4983?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Li Lu updated YARN-4983:
------------------------
    Attachment: YARN-4983-trunk.000.patch

This is a patch to quickly fix the problem. I'm reattaching the JvmMetrics after the rm got
transitioned to standby state. UgiMetrics is a different story since it fails when get reattached.
As a quick fix I recreate it. 

Right now this patch is just demo for a quick fix. I think the root contradiction here is
our metric system does not quite consider the case when a metric system got restarted (and
metrics got reattached), while the RM HA code relaunches the metric system. If there are more
elegant ways to fix this please do let me know. Thanks! 

> 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
>
>
> 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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