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https://issues.apache.org/jira/browse/HBASE-12054?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14145128#comment-14145128
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Matteo Bertozzi commented on HBASE-12054:
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[~jmhsieh] you are looking at the trunk patch, take a look at branch-1 there is
a new "data" table added to the upgrade migration. In trunk the migration test
is gone but the main code is still there (blame on jimmy HBASE-11611). I think
the migration tool is supposed to be removed from trunk tool. In trunk the
patch is just removing the list of reserved names.
> bad state after NamespaceUpgrade with reserved table names
> ----------------------------------------------------------
>
> Key: HBASE-12054
> URL: https://issues.apache.org/jira/browse/HBASE-12054
> Project: HBase
> Issue Type: Bug
> Affects Versions: 0.96.2, 0.99.0, 0.98.6.1
> Reporter: Matteo Bertozzi
> Assignee: Matteo Bertozzi
> Fix For: 0.98.7, 0.99.1
>
> Attachments: HBASE-12054-0.98.patch, HBASE-12054-branch1.patch,
> HBASE-12054-trunk.patch
>
>
> If 94 has a table called "data" NamespaceUpgrade will fail to bring that
> table up and the generated layout will be dirty with stuff like
> "/hbase/data/.data" and so on.
> (the reserved names that we have no longer apply in 96+ since the data is
> separate from the root dir)
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