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https://issues.apache.org/jira/browse/KYLIN-3423?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Shaofeng SHI resolved KYLIN-3423.
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Resolution: Fixed
> Performance improvement in FactDistinctColumnsMapper
> ----------------------------------------------------
>
> Key: KYLIN-3423
> URL: https://issues.apache.org/jira/browse/KYLIN-3423
> Project: Kylin
> Issue Type: Improvement
> Reporter: liyang
> Assignee: Shaoxiong Zhan
> Priority: Major
> Fix For: v2.5.0
>
>
> Currently FactDistinctColumnsMapper writes every cell to mapper output. In
> spite of mapper side Combiner, we could do better de-dup using available
> mapper memory.
> The situation becomes worse after KYLIN-3370, because not only dictionary
> columns, now it is every dimension column get written as mapper output.
> Suggest
> * For non-dictionary dimension column, only write min/max value to mapper
> output.
>
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