Zhijie Shen commented on YARN-3942:

[~jlowe], thanks for sharing more information about limitation. It sounds a 
reasonable tradeoff, and only affects the cross-app queries. One concern is 
that the patch only contains the read path, and the writer path only exists in 
TEZ. Therefore, it's not a complete solution from the perspective of YARN 
alone. Is it possible to generalize the write path in TEZ and promote it to 

> 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-3942.001.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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