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https://issues.apache.org/jira/browse/KYLIN-2731?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16275909#comment-16275909
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Zhong Yanghong commented on KYLIN-2731:
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https://github.com/apache/kylin/pull/85
> Introduce checkpoint executable
> -------------------------------
>
> Key: KYLIN-2731
> URL: https://issues.apache.org/jira/browse/KYLIN-2731
> Project: Kylin
> Issue Type: Sub-task
> Reporter: Zhong Yanghong
> Assignee: Zhong Yanghong
> Fix For: v2.3.0
>
> Attachments: One-Click Cube Optimization.png
>
>
> The basic idea of cube optimization without influencing current queries is
> shown at figure [^One-Click Cube Optimization.png].
> To optimize a cube with N ready segments,
> * For each segment, a corresponding optimize job will be triggered to adjust
> its cuboids.
> * If a optimize job finished, it's resulting segment status should be
> READY_PENDING and will not serve query.
> * There should be job to wait for all of the optimize jobs finishing their
> work, and then atomically remove old READY segments and update the status of
> READY_PENDING segments to READY for serving query. Here, we call this kind of
> job as {color:#f79232}checkpoint executable{color}.
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