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https://issues.apache.org/jira/browse/KYLIN-3013?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16240366#comment-16240366
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Billy Liu commented on KYLIN-3013:
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This is by design, not an issue.
Please follow http://kylin.apache.org/docs21/howto/howto_cleanup_storage.html
> cuboid data not cleared when Cube/Segment deleted
> -------------------------------------------------
>
> Key: KYLIN-3013
> URL: https://issues.apache.org/jira/browse/KYLIN-3013
> Project: Kylin
> Issue Type: Improvement
> Components: REST Service
> Affects Versions: v2.2.0
> Reporter: leontong
> Assignee: Zhong,Jason
>
> when segments/cubes were deleted, the related cuboid files which were
> generated during the build process remains in hdfs working directory. I
> assume these files would not be accessed after that and should be cleared
> away when segments/cubes were deleted.
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