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https://issues.apache.org/jira/browse/YARN-4308?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14980243#comment-14980243
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Junping Du commented on YARN-4308:
----------------------------------

I think the long discussion was happening in YARN-3304. As most people agreed, 
"-1" is used to represent resource is unavailable for tracking to differentiate 
with zero resource.

> 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
>
>
> 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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