Li Lu created YARN-4219:

             Summary: New levelDB cache storage for timeline v1.5
                 Key: YARN-4219
             Project: Hadoop YARN
          Issue Type: Bug
            Reporter: Li Lu
            Assignee: Li Lu

We need to have an "offline" caching storage for timeline server v1.5 after the 
changes in YARN-3942. The in memory timeline storage may run into OOM issues 
when used as a cache storage for entity file timeline storage. We can refactor 
the code and have a level db based caching storage for this use case. 

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