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https://issues.apache.org/jira/browse/KYLIN-3463?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16552397#comment-16552397
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Zhong Yanghong commented on KYLIN-3463:
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Hi [~kangkaisen], could you help review this patch? It's similar to
{{FactDistinctColumnsJob}}. Thanks very much.
> Improve optimize job by avoiding creating empty output files on HDFS
> --------------------------------------------------------------------
>
> Key: KYLIN-3463
> URL: https://issues.apache.org/jira/browse/KYLIN-3463
> Project: Kylin
> Issue Type: Improvement
> Reporter: Zhong Yanghong
> Assignee: Zhong Yanghong
> Priority: Major
> Attachments: APACHE-KYLIN-3463.patch
>
>
> For steps in an optimize job, like {{FilterRecommendCuboidDataJob}} &
> {{UpdateOldCuboidShardJob}}, {{MultipleOutputs}} is used to output data into
> different directories. Therefore, the default output file is empty.
> {{LazyOutputFormat}} should be used to prevent to create zero-sized default
> output.
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