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Posted to issues@kylin.apache.org by "Billy Liu (JIRA)" <ji...@apache.org> on 2018/01/25 06:44:00 UTC

[jira] [Updated] (KYLIN-3078) the estimated size of percentile measure is too big

     [ https://issues.apache.org/jira/browse/KYLIN-3078?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Billy Liu updated KYLIN-3078:
-----------------------------
    Priority: Major  (was: Critical)

> the estimated size of percentile measure  is too big
> ----------------------------------------------------
>
>                 Key: KYLIN-3078
>                 URL: https://issues.apache.org/jira/browse/KYLIN-3078
>             Project: Kylin
>          Issue Type: Bug
>            Reporter: Yifei Wu
>            Assignee: Yifei Wu
>            Priority: Major
>             Fix For: v2.3.0
>
>
> To set a shard number that will be for controlling the size per shard properly, we need to estimate cube size through accumulating all dimension and measure size roughly before building a cube. But the way of calculating the percentile measure is inaccurate currently and cause too many partitions for cube storage. Furthermore, it may affect the performance of SQL query.



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