Li Lu commented on YARN-3942:

Hi folks, I'm trying to figure out out next plan on this JIRA. Are we planning 
to make this fix and commit it to trunk soon? I'm asking this because I'm 
planning to start the next phase of this fix, which is to reduce the cache 
granularity to reduce refresh latency. If we're putting this fix back soon or 
the current patches are close, I can start on top of the existing patches. 
Otherwise maybe we'd like to improve the existing patches? Thanks for the info! 

> 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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