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https://issues.apache.org/jira/browse/HADOOP-7507?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13091423#comment-13091423
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Alejandro Abdelnur commented on HADOOP-7507:
--------------------------------------------
+1.
I've applied 'v2' patch and manually tested with the different versions of
ganglia, names are now namespaced. I.e.:
{code}
<METRIC NAME="jvm.NameNode.metrics.logWarn" VAL="0" TYPE="int32" UNITS=""
TN="5" TMAX="60" DMAX="0" SLOPE="both">
{code}
> 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
> Attachments: HADOOP-7507-v2.patch, HADOOP-7507v1.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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