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From "Xiao Chen (JIRA)" <j...@apache.org>
Subject [jira] [Comment Edited] (HADOOP-15067) GC time percentage reported in JvmMetrics should be a gauge, not counter
Date Wed, 22 Nov 2017 20:23:00 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-15067?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16263285#comment-16263285
] 

Xiao Chen edited comment on HADOOP-15067 at 11/22/17 8:22 PM:
--------------------------------------------------------------

+1 pending jenkins. Thanks Misha. Also thanks [~xkrogen] for the good catch.

Do you have any other comments Erik?

[~andrew.wang] FYI this would be a useful supportability fix that we'd like to add to 3.0.0,
so downstream could use hadoop-3.0.0 package.


was (Author: xiaochen):
+1 pending jenkins. Thanks Misha.

[~andrew.wang] FYI this would be a useful supportability fix that we'd like to add to 3.0.0,
so downstream could use hadoop-3.0.0 package.

> 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
>            Assignee: Misha Dmitriev
>         Attachments: HADOOP-15067.01.patch
>
>
> 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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