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Posted to issues@kylin.apache.org by "yuzhang qiu (JIRA)" <ji...@apache.org> on 2018/12/17 09:18:00 UTC
[jira] [Commented] (KYLIN-3453) Improve cube size estimation for
TOPN, COUNT DISTINCT
[ https://issues.apache.org/jira/browse/KYLIN-3453?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16722811#comment-16722811 ]
yuzhang qiu commented on KYLIN-3453:
------------------------------------
But why does kylin use the estimated result to split region(cuboid shard), rather than use the real size after step "convert cuboid data to HFile"？
> Improve cube size estimation for TOPN, COUNT DISTINCT
> -----------------------------------------------------
>
> Key: KYLIN-3453
> URL: https://issues.apache.org/jira/browse/KYLIN-3453
> Project: Kylin
> Issue Type: Improvement
> Reporter: Chao Long
> Assignee: Chao Long
> Priority: Major
> Fix For: v2.5.0
>
> Attachments: image-2018-07-24-16-29-07-359.png, image-2018-07-24-16-30-50-804.png, image-2018-07-24-16-33-43-231.png, image-2018-07-24-16-37-09-199.png, image-2018-07-24-17-11-26-283.png, image-2018-07-24-17-11-27-829.png, image-2018-07-24-17-12-25-880.png
>
>
> Currently, Kylin has poor cube size estimation for TOPN, COUNT DISTINCT. We should improve it, then we can get a reasonable split num when cube building.
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