[jira] [Updated] (YARN-3942) Timeline store to read events from HDFS

["Li Lu (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/YARN-3942?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Li Lu updated YARN-3942:
------------------------
    Attachment: YARN-3942-leveldb.001.patch

Thanks [~jlowe] for working on this! On top of the existing patch I built a new storage to move the in memory hash map storage to a level db database. The original in memory timeline store is not supposed to be used in production environments. The price for the new level db hash map storage is latency: it generally takes more time to fully load the entities into level db. Had an offline discussion with [~xgong] and seems like we need to reduce the granularity of caching to improve latency. We may want to address this problem in a separate JIRA. 

> 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-3942.001.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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