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Date: Mon, 16 May 2016 21:29:13 +0000 (UTC)
From: "Daniel Templeton (JIRA)" <jira@apache.org>
To: yarn-issues@hadoop.apache.org
Message-ID: <JIRA.12908617.1446049027000.201174.1463434153341@Atlassian.JIRA>
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Subject: [jira] [Commented] (YARN-4308) ContainersAggregated CPU resource
 utilization reports negative usage in first few heartbeats
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archived-at: Mon, 16 May 2016 21:29:16 -0000


    [ https://issues.apache.org/jira/browse/YARN-4308?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15285353#comment-15285353 ] 

Daniel Templeton commented on YARN-4308:
----------------------------------------

If the admin has to enable debug and bounce the daemon, the situation that caused the issue may not survive the bounce.  In that case, I don't think adding a metric will be enough of an improvement over javadocs and comments to be worth it.  I'm fine with just making sure that anyone hunting reasons for missing reports will trip over a pointer to the likely cause.

> ContainersAggregated CPU resource utilization reports negative usage in first few heartbeats
> --------------------------------------------------------------------------------------------
>
>                 Key: YARN-4308
>                 URL: https://issues.apache.org/jira/browse/YARN-4308
>             Project: Hadoop YARN
>          Issue Type: Bug
>          Components: nodemanager
>    Affects Versions: 2.7.1
>            Reporter: Sunil G
>            Assignee: Sunil G
>         Attachments: 0001-YARN-4308.patch, 0002-YARN-4308.patch
>
>
> NodeManager reports ContainerAggregated CPU resource utilization as -ve value in first few heartbeats cycles. I added a new debug print and received below values from heartbeats.
> {noformat}
> INFO org.apache.hadoop.yarn.server.nodemanager.containermanager.monitor.ContainersMonitorImpl: ContainersResource Utilization : CpuTrackerUsagePercent : -1.0 
> INFO org.apache.hadoop.yarn.server.nodemanager.containermanager.monitor.ContainersMonitorImpl:ContainersResource Utilization :  CpuTrackerUsagePercent : 198.94598
> {noformat}
> Its better we send 0 as CPU usage rather than sending a negative values in heartbeats eventhough its happening in only first few heartbeats.


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