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https://issues.apache.org/jira/browse/KYLIN-6037?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17928322#comment-17928322
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Guoliang Sun commented on KYLIN-6037:
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h3. Current Situation
In the Kylin4 version, if there is ACL-related information and the version does
not have data permission separation, migrating to a later version will generate
an "upgrade" folder to record data permission separation. Subsequently,
upgrading this version to Kylin5 will result in an error.
> Metadata migration fails when the backup metadata contains an "upgrade"
> directory
> ---------------------------------------------------------------------------------
>
> Key: KYLIN-6037
> URL: https://issues.apache.org/jira/browse/KYLIN-6037
> Project: Kylin
> Issue Type: Bug
> Affects Versions: 5.0.0
> Reporter: Guoliang Sun
> Priority: Major
>
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