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From "Andrew Purtell (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-8015) Support for Namespaces
Date Sat, 20 Sep 2014 21:21:36 GMT

    [ https://issues.apache.org/jira/browse/HBASE-8015?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14142204#comment-14142204

Andrew Purtell commented on HBASE-8015:

bq. Do different namespaces for the same table name create different tables directories in
hdfs and are maintained in different region files? 


bq. How does this affect namenode memory if I want to have one namespace per user and I have
a million users registered to my system. Will this scale?

As you would anticipate, eventually not, depending on how many tables each user creates and
the capabilities of the namenode. I believe the intent of namespaces is to support multitenancy
where a tenant shares a namespace and is a department or similar grouping within a larger
organization. The namespace is a supergroup of tables sharing common ACLs, quotas, and the

bq. I would like namespace to be totally logical separation all sharing the same region file.
Is this case?

No it is not and this would be a substantial change. 

> 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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