Li Lu created YARN-4265:

             Summary: Provide new timeline plugin storage to support 
fine-grained entity caching
                 Key: YARN-4265
             Project: Hadoop YARN
          Issue Type: Sub-task
            Reporter: Li Lu
            Assignee: Li Lu

To support the newly proposed APIs in YARN-4234, we need to create a new plugin 
timeline store. The store may have similar behavior as the 
EntityFileTimelineStore proposed in YARN-3942, but cache date in cache id 
granularity, instead of application id granularity. Let's have this storage as 
a standalone one, instead of updating EntityFileTimelineStore, to keep the 
existing store (EntityFileTimelineStore) stable. 

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