Sangjin Lee commented on YARN-3942:

+1 with this idea as a way to mitigate the scalability/reliability concern of 
v.1 until we have v.2 ready.

We talked about it briefly offline, but v.2 could borrow some parts of this 
idea to be able to spill over pending writes to something like hdfs in case the 
real backend storage is unavailable.

> 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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