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From "Chris Nauroth (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-12356) CPU usage statistics on Windows
Date Thu, 17 Dec 2015 20:01:46 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-12356?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15062681#comment-15062681
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Chris Nauroth commented on HADOOP-12356:
----------------------------------------

I'm not confident enough about the YARN part of this patch, so I'd like to call in help from
someone deeper on YARN.  [~leftnoteasy], would you mind taking a look?  I'm +1 for the change
in {{SysInfoWindows}}, but I'm not sure about the change in {{NodeResourceMonitorImpl}}.

[~elgoiri], my understanding of the resource monitoring code at this layer is that it needs
to track utilization as a percentage, not in units of vcores.  I'd also be concerned that
changing this calculation could cause unusual effects during a rolling upgrade scenario, when
some NodeManagers are running the old calculation and some NodeManagers are running the new
calculation.  I expect Wangda can give us a more definitive answer.

Thanks!

> CPU usage statistics on Windows
> -------------------------------
>
>                 Key: HADOOP-12356
>                 URL: https://issues.apache.org/jira/browse/HADOOP-12356
>             Project: Hadoop Common
>          Issue Type: Bug
>          Components: util
>         Environment: CPU: Intel Xeon
> OS: Windows server
>            Reporter: Yunqi Zhang
>            Assignee: Yunqi Zhang
>              Labels: easyfix, newbie, patch
>         Attachments: 0001-Correct-the-CPU-usage-calcualtion.patch, 0001-Correct-the-CPU-usage-calcualtion.patch,
HADOOP-12356-v3.patch
>
>   Original Estimate: 2h
>  Remaining Estimate: 2h
>
> The CPU usage information on Windows is computed incorrectly. The proposed patch fixes
the issue, and unifies the the interface with Linux.



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