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https://issues.apache.org/jira/browse/HBASE-8015?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13689419#comment-13689419
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Francis Liu commented on HBASE-8015:
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I thought of a way to implement [~sershe] idea. It was simple enough so I
thought I'd give it a try. Essentially keep an in-memory list of tables which
make use of the delimiter (ie '.') and consider these tables as exceptions to
the namespace rule and handle them properly to make sure they are part of the
default namespace. Have an added constraint that prevent creation of namespaces
and tables that would conflict with any of the exception tables (ie ns1 and
ns1.foo).
Surprise here is:
- you can't create tables with the delimiter no longer unless you create the
appropriate namespace.
- you can't create tables/namespace which conflict the exception
tables/namespaces
- the exception list is derived by scanning the default namespace directories
in .tmp, .data and .archive
Here's a sample of how it works. I've updated the TestNamespaceUpgrade test to
verify that it works:
https://github.com/francisliu/hbase_namespace/tree/core_8408_exception_list
> Support for Namespaces
> ----------------------
>
> Key: HBASE-8015
> URL: https://issues.apache.org/jira/browse/HBASE-8015
> Project: HBase
> Issue Type: New Feature
> Reporter: Francis Liu
> Assignee: Francis Liu
> Attachments: HBASE-8015_draft_94.patch, Namespace Design.pdf
>
>
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