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From "Shaofeng SHI (JIRA)" <j...@apache.org>
Subject [jira] [Assigned] (KYLIN-3472) TopN merge in Spark engine is slow
Date Thu, 23 Aug 2018 01:19:00 GMT

     [ https://issues.apache.org/jira/browse/KYLIN-3472?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Shaofeng SHI reassigned KYLIN-3472:
-----------------------------------

         Assignee: Shaofeng SHI
    Fix Version/s: v2.5.0

> TopN merge in Spark engine is slow
> ----------------------------------
>
>                 Key: KYLIN-3472
>                 URL: https://issues.apache.org/jira/browse/KYLIN-3472
>             Project: Kylin
>          Issue Type: Bug
>          Components: Spark Engine
>            Reporter: Shaofeng SHI
>            Assignee: Shaofeng SHI
>            Priority: Major
>             Fix For: v2.5.0
>
>         Attachments: image-2018-07-27-18-16-12-112.png, image-2018-07-27-18-16-12-192.png
>
>
> Spark executor thread dump shows most CPU are spent on TopNCounter#merge . !image-2018-07-27-18-16-12-192.png!



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