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Posted to issues@kylin.apache.org by "ASF subversion and git services (JIRA)" <ji...@apache.org> on 2018/08/02 01:20:00 UTC

[jira] [Commented] (KYLIN-3472) TopN merge in Spark engine is slow

    [ https://issues.apache.org/jira/browse/KYLIN-3472?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16566213#comment-16566213 ] 

ASF subversion and git services commented on KYLIN-3472:
--------------------------------------------------------

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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