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https://issues.apache.org/jira/browse/KYLIN-3472?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Shaofeng SHI updated KYLIN-3472:
--------------------------------
Priority: Minor (was: Major)
Issue Type: Improvement (was: Bug)
> TopN merge in Spark engine performance tunning
> ----------------------------------------------
>
> Key: KYLIN-3472
> URL: https://issues.apache.org/jira/browse/KYLIN-3472
> Project: Kylin
> Issue Type: Improvement
> Components: Spark Engine
> Reporter: Shaofeng SHI
> Assignee: Shaofeng SHI
> Priority: Minor
> 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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