[jira] [Created] (YARN-5177) Make Node-Manager Download-Resource Component extensible.

["Emeka (JIRA)" <ji...@apache.org>]

Emeka created YARN-5177:
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             Summary: Make Node-Manager Download-Resource Component extensible.
                 Key: YARN-5177
                 URL: https://issues.apache.org/jira/browse/YARN-5177
             Project: Hadoop YARN
          Issue Type: Improvement
          Components: nodemanager
    Affects Versions: 2.7.0
            Reporter: Emeka
            Priority: Minor


Problem:
- Downloading files to a local machine/node is called "resource-localization".
- There are two components that perform resource-location (PublicLocalizer and ComponetLocalizers)
- Both components utilizes FSDownload.class to perform their downloads.
- We need a custom implementation of FSDownload.

Solution:
- With this change, we make FSDownload.class extensible by wrapping it in a new ResourceDownloader.interface
- We also update the PublicLocalizer and ComponetLocalizers to load ResourceDownloader rather than FSDownload.
- NOTE: We use reflection to load the right implementation during runtime.





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