| Class | Description | 
|---|---|
| SCMController | The controller class for the shared cache manager web app. | 
| SCMMetricsInfo | This class is used to summarize useful shared cache manager metrics for the
 webUI display. | 
| SCMOverviewPage | This class is to render the shared cache manager web ui overview page. | 
| SCMWebServer | A very simple web interface for the metrics reported by
  SharedCacheManagerTODO: Security for web ui (See YARN-2774) | 
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