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https://issues.apache.org/jira/browse/KYLIN-3238?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Xiaoxiang Yu closed KYLIN-3238.
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Resolved in release 3.1.0 (2020-07-03)
> Fix NPE when CubeInstance.getLatestReadySegment() returns null
> --------------------------------------------------------------
>
> Key: KYLIN-3238
> URL: https://issues.apache.org/jira/browse/KYLIN-3238
> Project: Kylin
> Issue Type: Sub-task
> Reporter: Zhong Yanghong
> Assignee: Zhong Yanghong
> Priority: Major
> Fix For: v3.1.0
>
>
> Currently we suppose if a cube is in READY status, there should exist READY
> segments. Then when this kind of cube is selected as a candidate for a query,
> neither {{getLatestReadySegment}} in {{CubeInstance}} will return null, nor
> {{cube.getSegments().get(0)}} will throw {{IndexOutOfBoundsException}}.
> However, currently we allow to delete segments by REST API when cube is in
> READY status, which I think it's not reasonable. To deal with this issue, I
> propose not to allow segment deletion by REST API when its cube is in READY
> status.
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