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From "Naganarasimha G R (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-4712) CPU Usage Metric is not captured properly in YARN-2928
Date Thu, 25 Feb 2016 05:18:18 GMT

    [ https://issues.apache.org/jira/browse/YARN-4712?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15166740#comment-15166740
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Naganarasimha G R commented on YARN-4712:
-----------------------------------------

One way to avoid ( in particular to CPU usage) is multiply with 100 and floor it and then
type cast it to int. 
But we need to further think YARN-4053 's aproach is not a limitation for others to load the
metrics as it doesnt support decimals !
cc /[~sjlee0] & [~varun_saxena]

> 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
>
> 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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