Jason Lowe commented on YARN-3942:

I think the best way forward is to get the original patch cleaned up and 
integrated, as a number of people are already using them as-is.  Then we can 
address extensions like the leveldb cache enhancement and finer granularity 
caching in subsequent JIRAs which will help keep the patches more reasonably 
sized.  I'll be putting up a patch to address Jonathan's recent comment soon, 
and hopefully I'll have time to add some unit tests shortly afterwards.

> 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-leveldb.002.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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