JvmMetrics can't distinguish between jvms with same processName
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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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