[jira] [Updated] (YARN-6738) LevelDBCacheTimelineStore should reuse ObjectMapper instances

["Zoltan Haindrich (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/YARN-6738?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Zoltan Haindrich updated YARN-6738:
-----------------------------------
    Attachment: Screen Shot 2017-06-23 at 2.43.06 PM.png

> LevelDBCacheTimelineStore should reuse ObjectMapper instances
> -------------------------------------------------------------
>
>                 Key: YARN-6738
>                 URL: https://issues.apache.org/jira/browse/YARN-6738
>             Project: Hadoop YARN
>          Issue Type: Improvement
>          Components: timelineserver
>            Reporter: Zoltan Haindrich
>         Attachments: Screen Shot 2017-06-23 at 2.43.06 PM.png
>
>
> Using TezUI sometimes times out...and the cause of it was that the query was quite large; and the leveldb handler seems like recreates the {{ObjectMapper}} for every read - this is unfortunate; since the ObjectMapper have to rescan the class annotations which may take some time.
> Keeping the objectmapper reduces the ATS call time from 17 seconds to 3 seconds for me...which was enough to get my tez-ui working again :)



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