[jira] [Commented] (KYLIN-2135) Enlarge FactDistinctColumns reducer number

["Shaofeng SHI (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/KYLIN-2135?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15612068#comment-15612068 ] 

Shaofeng SHI commented on KYLIN-2135:
-------------------------------------

hi kaisen, what's the cardinality of the largest column in this case? did you identify the performance bottleneck?

> Enlarge FactDistinctColumns reducer number
> ------------------------------------------
>
>                 Key: KYLIN-2135
>                 URL: https://issues.apache.org/jira/browse/KYLIN-2135
>             Project: Kylin
>          Issue Type: Improvement
>          Components: Job Engine
>    Affects Versions: v1.5.4.1
>            Reporter: kangkaisen
>            Assignee: kangkaisen
>
> When the hive table has billions of rows and use global dictionary for precise count distinct measures, the  {{Extract Fact Table Distinct Columns}} job will run o long time.
> So we could use more reducer to deal with the one column.



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