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https://issues.apache.org/jira/browse/KYLIN-3472?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16566213#comment-16566213
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ASF subversion and git services commented on KYLIN-3472:
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Commit 44926b777f81d34d4e9da25e900f352be313dd58 in kylin's branch
refs/heads/master from shaofengshi
[ https://gitbox.apache.org/repos/asf?p=kylin.git;h=44926b7 ]
KYLIN-3472 Optimize TopN merge in for Spark engine
> 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
> Priority: Major
> 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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