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https://issues.apache.org/jira/browse/KYLIN-1960?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Shaofeng SHI closed KYLIN-1960.
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Resolution: Won't Fix
> Provide a new build type called COVER
> -------------------------------------
>
> Key: KYLIN-1960
> URL: https://issues.apache.org/jira/browse/KYLIN-1960
> Project: Kylin
> Issue Type: New Feature
> Reporter: Zhong Yanghong
> Assignee: Zhong Yanghong
> Priority: Major
> Attachments: provide_a_new_build_type_COVER.patch
>
>
> The current three build types are not good at dealing with incremental
> building with refreshing old data.
> For example, there are [S1, S2, S3] segments in a cube. S1 with time range
> [t1, t2); S2 with time range [t2, t3); S3 with time range [t3, t4).
> Now users want to refresh the old data within [t2, t4). The current strategy
> is to merge S2 and S3 firstly. Then refresh the bigger segment with time
> range [t2, t4). The first step is meaningless and wasteful.
> What if users want to build a new segment with time range [t2, t5), where t5
> is larger than t4. The current strategy is clumsy.
> How about providing a new build type? Here, it's called COVER. For this type,
> users also should provide start time and end time as parameters. The start
> time should match the boundaries of segments. In this case, it should be in
> set {t1, t2, t3, t4}. While the end time should be larger than t4, or match
> one of the end times of existing segments. In this case, it should be in set
> {t2, t3, t4}. Of course, the end time should be larger than the start time.
> What job engine will do with this build type is as follows:
> 1. first build a new segment with the time range;
> 2. then the covered segments will be deleted.
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