Jian He commented on YARN-3272:

attached a screens shot to demonstrate how the locality is represented. 
The table indicates  the number of certain type of containers(i.e. node_local, 
rack_local, off_switch) satisfied by certain type of resource requests(i.e. 
node_local, rack_local, off_switch)

> Surface container locality info 
> --------------------------------
>                 Key: YARN-3272
>                 URL: https://issues.apache.org/jira/browse/YARN-3272
>             Project: Hadoop YARN
>          Issue Type: Improvement
>            Reporter: Jian He
>            Assignee: Jian He
>         Attachments: container locality table.png
> We can surface the container locality info on the web UI. This is useful to 
> debug "why my applications are progressing slow", especially when locality is 
> bad.

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