Li Lu updated YARN-3942:
    Attachment: YARN-3942-leveldb.001.patch

Thanks [~jlowe] for working on this! On top of the existing patch I built a new 
storage to move the in memory hash map storage to a level db database. The 
original in memory timeline store is not supposed to be used in production 
environments. The price for the new level db hash map storage is latency: it 
generally takes more time to fully load the entities into level db. Had an 
offline discussion with [~xgong] and seems like we need to reduce the 
granularity of caching to improve latency. We may want to address this problem 
in a separate JIRA. 

> Timeline store to read events from HDFS
> ---------------------------------------
>                 Key: YARN-3942
>                 URL: https://issues.apache.org/jira/browse/YARN-3942
>             Project: Hadoop YARN
>          Issue Type: Improvement
>          Components: timelineserver
>            Reporter: Jason Lowe
>            Assignee: Jason Lowe
>         Attachments: YARN-3942-leveldb.001.patch, YARN-3942.001.patch
> This adds a new timeline store plugin that is intended as a stop-gap measure 
> to mitigate some of the issues we've seen with ATS v1 while waiting for ATS 
> v2.  The intent of this plugin is to provide a workable solution for running 
> the Tez UI against the timeline server on a large-scale clusters running many 
> thousands of jobs per day.

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