Nathan Roberts commented on YARN-5356:

Hi [~elgoiri]. Tried out the patch but get NPE in RM because physicalResource 
is null. Think this code in 
 needs to set it via the builder as well.
  public synchronized void setPhysicalResource(Resource pPhysicalResource) {
    if (pPhysicalResource == null) {
    this.physicalResource = pPhysicalResource;

> NodeManager should communicate physical resource capability to ResourceManager
> ------------------------------------------------------------------------------
>                 Key: YARN-5356
>                 URL: https://issues.apache.org/jira/browse/YARN-5356
>             Project: Hadoop YARN
>          Issue Type: Improvement
>          Components: nodemanager, resourcemanager
>    Affects Versions: 3.0.0-alpha1
>            Reporter: Nathan Roberts
>            Assignee: Inigo Goiri
>         Attachments: YARN-5356.000.patch, YARN-5356.001.patch, 
> YARN-5356.002.patch
> Currently ResourceUtilization contains absolute quantities of resource used 
> (e.g. 4096MB memory used). It would be good if the NM also communicated the 
> actual physical resource capabilities of the node so that the RM can use this 
> data to schedule more effectively (overcommit, etc)
> Currently the only available information is the Resource the node registered 
> with (or later updated using updateNodeResource). However, these aren't 
> really sufficient to get a good view of how utilized a resource is. For 
> example, if a node reports 400% CPU utilization, does that mean it's 
> completely full, or barely utilized? Today there is no reliable way to figure 
> this out.
> [~elgoiri] - Lots of good work is happening in YARN-2965 so curious if you 
> have thoughts/opinions on this?

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