Íñigo Goiri reassigned YARN-10216:

    Assignee: Cyrus Jackson

> Utility to dynamically reload Configuration on the disk
> -------------------------------------------------------
>                 Key: YARN-10216
>                 URL: https://issues.apache.org/jira/browse/YARN-10216
>             Project: Hadoop YARN
>          Issue Type: New Feature
>            Reporter: Cyrus Jackson
>            Assignee: Cyrus Jackson
>            Priority: Major
>         Attachments: image-2020-04-06-09-50-51-948.png
> There should be a way to dynamically reload the configuration properties from 
> the disk. The purpose of this feature is to let individual classes which are 
> interested in observing this configuration changes, to be notified when the 
> conf is reloaded from the disk. This is similar to how Hbase has done.
> *Class Diagram*
>                                           !image-2020-04-06-09-50-51-948.png!
> The approach is based on the adaption of Hbase Online Configuration. In this 
> case, the configuration file is monitored for any changes on the disk. If the 
> file has changed, the properties of Configuration is reloaded and all the 
> observers are notified. 
> The classes that implements the observers updates the necessary values if 
> required.

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