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From "Alejandro Abdelnur (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HADOOP-7507) jvm metrics all use the same namespace
Date Wed, 07 Sep 2011 21:41:11 GMT

     [ https://issues.apache.org/jira/browse/HADOOP-7507?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Alejandro Abdelnur updated HADOOP-7507:
---------------------------------------

    Attachment: HADOOP-7507v7.patch

v7 addresses Todd's comments with a minor twist, using @InterfaceAudience.Private annotation
because the testcase is in a different package.

> jvm metrics all use the same namespace
> --------------------------------------
>
>                 Key: HADOOP-7507
>                 URL: https://issues.apache.org/jira/browse/HADOOP-7507
>             Project: Hadoop Common
>          Issue Type: Bug
>          Components: metrics
>    Affects Versions: 0.20.2
>            Reporter: Jeff Bean
>            Assignee: Alejandro Abdelnur
>             Fix For: 0.23.0, 0.24.0
>
>         Attachments: HADOOP-7507-v2.patch, HADOOP-7507v1.patch, HADOOP-7507v3.patch,
HADOOP-7507v4.patch, HADOOP-7507v5.patch, HADOOP-7507v6.patch, HADOOP-7507v7.patch, JvmMetrics.java,
hadoop-metrics.properties, screenshot-1.jpg
>
>
> Ganglia jvm metrics don't make sense because it's not clear which java process the metrics
refer to. In fact, all hadoop java processes running on a node report their jvm metrics to
the same namespace.
> The metrics are exposed by the "jvm" context in JvmMetrics.java. This leads to confusing
and nonsensical graphs in ganglia and maybe other monitoring tools.
> One way to fix this is to make sure the process name is reported in the jvm context,
making it clear which process is associated with the context, and separating out the jvm metrics
per process.
> This is marked as an "incompatible change" because the fix provided removes the JVM metrics
and replaces it with process-specific metrics.

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