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https://issues.apache.org/jira/browse/HBASE-28376?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17818625#comment-17818625
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Viraj Jasani commented on HBASE-28376:
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Somewhat similar case to HBASE-25902
> Column family ns does not exist in region during upgrade to 3.0.0-beta-2
> ------------------------------------------------------------------------
>
> Key: HBASE-28376
> URL: https://issues.apache.org/jira/browse/HBASE-28376
> Project: HBase
> Issue Type: Bug
> Affects Versions: 3.0.0-beta-1
> Reporter: Bryan Beaudreault
> Priority: Blocker
>
> Upgrading from 2.5.x to 3.0.0-alpha-2, migrateNamespaceTable kicks in to copy
> data from the namespace table to an "ns" family of the meta table. If you
> don't have an "ns" family, the migration fails and the hmaster will crash
> loop. You then can't rollback, because the briefly alive upgraded hmaster
> created a procedure that can't be deserialized by 2.x (I don't have this log
> handy unfortunately). I tried pushing code to create the ns family on
> startup, but it doesnt work becuase the migration happens while the hmaster
> is still initializing.
> So it seems imperative that you create the ns family before upgrading. We
> should handle this more gracefully.
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