[jira] [Closed] (KYLIN-3238) Fix NPE when CubeInstance.getLatestReadySegment() returns null

["Xiaoxiang Yu (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/KYLIN-3238?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Xiaoxiang Yu closed KYLIN-3238.
-------------------------------

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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