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From "Jeff Bean (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HADOOP-7507) jvm metrics all use the same namespace
Date Wed, 03 Aug 2011 17:19:27 GMT
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

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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