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https://issues.apache.org/jira/browse/HBASE-8015?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13706588#comment-13706588
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Francis Liu commented on HBASE-8015:
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I had a chat with Stack yesterday to iron out some design details. Here's a
quick summary of things:
1. We will be going with ':' as the delimiter. We'll make it so that the
tableNames stored on the filesystem don't get stored fully-qualified. So that
leaves HFileLinks which needs table names to be written with the namespace.
2. a TableName POJO will be the class that gets passed around where a tableName
reference is needed. HTable and HBaseAdmin will have the old apis overloaded
with new apis that accept the TableName pojo. In addition, the old apis will
recognize fully qualified table names. This keeps symmetry between both apis.
Having colon as a delimiter will guarantee there is no confusion and clear
intent.
3. Since we will be using a TableName pojo everywhere internally. That means
all the coprocessor hooks that have tableNames will change as well. This will
break backward compatibility.
4. External interfaces REST, Thrift and CLI will not require significant
changes as tables can be referenced using fully-qualified. We will have to add
namespace CRUD apis to REST and Thrift at a latter point.
5. In a separate patch remove '.' prefix in non-table dirs in root dir
> 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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