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From "Shaofeng SHI (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (KYLIN-980) FactDistinctColumnsJob to support high cardinality columns
Date Wed, 27 Jan 2016 05:07:39 GMT

    [ https://issues.apache.org/jira/browse/KYLIN-980?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15118662#comment-15118662
] 

Shaofeng SHI commented on KYLIN-980:
------------------------------------

No pull request, I directly pushed to git, you can find the commit with keyword "KYLIN-980".
This task is done now, the subsequent task is KYLIN-1178 which is open.

> FactDistinctColumnsJob to support high cardinality columns
> ----------------------------------------------------------
>
>                 Key: KYLIN-980
>                 URL: https://issues.apache.org/jira/browse/KYLIN-980
>             Project: Kylin
>          Issue Type: Improvement
>          Components: Job Engine
>    Affects Versions: v0.7.2
>            Reporter: Shaofeng SHI
>            Assignee: Shaofeng SHI
>              Labels: newbie
>             Fix For: 2.0
>
>
> In FactDistinctColumnsJob's combiner and reducer, it uses a HashSet to remove the duplicated
values; But if a column's cardinality is very big, say > 10 Million, it may reports OutOfMemory
error;
> It should be enhanced to support such case.



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