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From "Naganarasimha G R (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (YARN-4712) CPU Usage Metric is not captured properly in YARN-2928
Date Wed, 02 Mar 2016 03:24:18 GMT

     [ https://issues.apache.org/jira/browse/YARN-4712?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

Naganarasimha G R updated YARN-4712:
    Attachment: YARN-4712-YARN-2928.v1.002.patch

Hi [~varun_saxena],
bq. I was incorrectly assuming that CPU % is reported to NMTimelinePublisher in the range
of 0-1. This doesn't seem to be the case though.
You are right even i tested it i was able to to get more than cores as percentage. so multiplying
with 100 is not required and even i felt *round* is better than floor have incorporated the
required changes.

bq.  2 of the checkstyle issues seem fixable.
Well have corrected it but i generally use the eclipse formatter which follows the sun conventions
as mentioned in the [Hadoop wiki|https://wiki.apache.org/hadoop/HowToContribute] , so usually
eclipse formatter takes care of 80 chars per line effectively where ever possible but is required
to do additionally apart from it? cc/ [~sjlee0]

> CPU Usage Metric is not captured properly in YARN-2928
> ------------------------------------------------------
>                 Key: YARN-4712
>                 URL: https://issues.apache.org/jira/browse/YARN-4712
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>          Components: timelineserver
>            Reporter: Naganarasimha G R
>            Assignee: Naganarasimha G R
>              Labels: yarn-2928-1st-milestone
>         Attachments: YARN-4712-YARN-2928.v1.001.patch, YARN-4712-YARN-2928.v1.002.patch
> There are 2 issues with CPU usage collection 
> * I was able to observe that that many times CPU usage got from {{pTree.getCpuUsagePercent()}}
is ResourceCalculatorProcessTree.UNAVAILABLE(i.e. -1) but ContainersMonitor do the calculation
 i.e. {{cpuUsageTotalCoresPercentage = cpuUsagePercentPerCore /resourceCalculatorPlugin.getNumProcessors()}}
because of which UNAVAILABLE check in {{NMTimelinePublisher.reportContainerResourceUsage}}
is not encountered. so proper checks needs to be handled
> * {{EntityColumnPrefix.METRIC}} uses always LongConverter but ContainerMonitor is publishing
decimal values for the CPU usage.

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