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List:       hadoop-dev
Subject:    [jira] Created: (HADOOP-6874) JvmMetrics can't distinguish between
From:       "Franklin Ta (JIRA)" <jira () apache ! org>
Date:       2010-07-22 4:36:49
Message-ID: 24087775.511231279773409885.JavaMail.jira () thor
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JvmMetrics can't distinguish between jvms with same processName
---------------------------------------------------------------

                 Key: HADOOP-6874
                 URL: https://issues.apache.org/jira/browse/HADOOP-6874
             Project: Hadoop Common
          Issue Type: Bug
          Components: metrics
    Affects Versions: 0.20.2
            Reporter: Franklin Ta
            Priority: Minor


JvmMetrics has three tags: hostName, processName, and sessionId. For processes such \
tasktracker/jobtracker/namenode/datanode which there is only one of on each host, \
these tags are fine. But for process names such as "MAP" and "REDUCE", since there \
might be multiple jvms running map/reduce tasks, we might end up with multiple set of \
metrics which all have the same tags, and no way to find out which jvm they actually \
correspond to. (In addition, since there is jvm reuse, those process names might not \
correspond to the actual task being ran)

A quick fix is to change this line in Child.java
JvmMetrics.init(task.getPhase().toString(), job.getSessionId());
to this
JvmMetrics.init(jvmId.toString(), job.getSessionId());
so that we are using the jvm id for the process name instead.

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