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https://issues.apache.org/jira/browse/YARN-4233?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14959160#comment-14959160
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Jason Lowe commented on YARN-4233:
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Most of the details can be found in the discussion in YARN-3942.  Executive 
summary is that the original ATS has scaling issues, and we need an interim 
solution until the [ATSv2 
effort|https://issues.apache.org/jira/browse/YARN-2928] is ready.  The basic 
idea is to have clients and jobs write entities to HDFS rather than posting 
them to a single, central web service to better handle the write load from a 
large cluster running lots of jobs concurrently.  We need something like this 
to get a working Tez UI on our large clusters and can't wait until ATSv2 is 
ready.

> YARN Timeline Service plugin: ATS v1.5
> --------------------------------------
>
>                 Key: YARN-4233
>                 URL: https://issues.apache.org/jira/browse/YARN-4233
>             Project: Hadoop YARN
>          Issue Type: New Feature
>          Components: timelineserver
>            Reporter: Xuan Gong
>            Assignee: Xuan Gong
>
> Copy the description from YARN-3942: Timeline store to read events from HDFS
> 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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