Chris Douglas commented on YARN-3820:

[~aw] Is there a corresponding part of the datanode already monitoring these 
resources? I looked, but found only the metrics. This JIRA and YARN-3819 only 
extend the monitoring. As Karthik pointed out in YARN-2745, refactoring for 
more unified resource monitoring is in YARN-3332.

On the patch: looks good, though why does the disk need a {{forcedRead}} 

> Collect disks usages on the node
> --------------------------------
>                 Key: YARN-3820
>                 URL: https://issues.apache.org/jira/browse/YARN-3820
>             Project: Hadoop YARN
>          Issue Type: New Feature
>    Affects Versions: 3.0.0
>            Reporter: Robert Grandl
>            Assignee: Robert Grandl
>              Labels: yarn-common, yarn-util
>         Attachments: YARN-3820-1.patch, YARN-3820-2.patch, YARN-3820-3.patch, 
> YARN-3820-4.patch
> In this JIRA we propose to collect disks usages on a node. This JIRA is part 
> of a larger effort of monitoring resource usages on the nodes. 

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