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From "Mike Drob (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-7602) NM should reference the singleton JvmMetrics instance
Date Mon, 04 Dec 2017 16:55:00 GMT

    [ https://issues.apache.org/jira/browse/YARN-7602?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16277068#comment-16277068

Mike Drob commented on YARN-7602:

There is no assertions in {{testReferenceOfSingletonJvmMetrics}}.

Would we want to check that the same instance is returned before and after calls to {{initSingleton}}?
Before and after starting a NM?

> NM should reference the singleton JvmMetrics instance
> -----------------------------------------------------
>                 Key: YARN-7602
>                 URL: https://issues.apache.org/jira/browse/YARN-7602
>             Project: Hadoop YARN
>          Issue Type: Bug
>          Components: nodemanager
>    Affects Versions: 3.0.0-beta1
>            Reporter: Haibo Chen
>            Assignee: Haibo Chen
>         Attachments: YARN-7602.00.patch
> NM does not reference the singleton JvmMetrics instance in its NodeManagerMetrics. This
will easily cause NM to crash if any of the node manager components tries to register JvmMetrics.
An example of this is TimelineCollectorManager that hosts a HBaseClient that registers JvmMetrics
again. See HBASE-19409 for details.

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