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From "Zoltan Haindrich (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-6738) LevelDBCacheTimelineStore should reuse ObjectMapper instances
Date Wed, 28 Jun 2017 06:02:00 GMT

    [ https://issues.apache.org/jira/browse/YARN-6738?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16065963#comment-16065963
] 

Zoltan Haindrich commented on YARN-6738:
----------------------------------------

Thank you for adding me to the contributor list... and for reviewing and committing this change!

> 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
>            Assignee: Zoltan Haindrich
>             Fix For: 2.9.0, 3.0.0-alpha4, 2.8.2
>
>         Attachments: Screen Shot 2017-06-23 at 2.43.06 PM.png, YARN-6738.1.patch, YARN-6738.2.patch
>
>
> 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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