[jira] [Created] (HADOOP-15067) GC time percentage reported in JvmMetrics should be a gauge, not counter

["Misha Dmitriev (JIRA)" <ji...@apache.org>]

Misha Dmitriev created HADOOP-15067:
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             Summary: GC time percentage reported in JvmMetrics should be a gauge, not counter
                 Key: HADOOP-15067
                 URL: https://issues.apache.org/jira/browse/HADOOP-15067
             Project: Hadoop Common
          Issue Type: Bug
            Reporter: Misha Dmitriev


A new GcTimeMonitor class has been recently added, and the corresponding metrics added in JvmMetrics.java, line 190:

{code}
    if (gcTimeMonitor != null) {
      rb.addCounter(GcTimePercentage,
          gcTimeMonitor.getLatestGcData().getGcTimePercentage());
    }
{code}

Since GC time percentage can go up and down, a gauge rather than counter should be used to report it. That is, {{addCounter}} should be replaced with {{addGauge}} above.



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