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https://issues.apache.org/jira/browse/HBASE-18994?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16218177#comment-16218177
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Chia-Ping Tsai commented on HBASE-18994:
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bq. We should figure it. I was trying to figure how to prevent random person 
creating system tables; has to be a Master CoProcessor at least. TBD.
I test it just now. Unfortunately, it is ok to build table in System namespace. 
This issue is similar to bypass...Opening a thread in dev list is necessary as 
someone may have built their tables in System namespace.

> Decide if META/System tables should use Compacting Memstore or Default 
> Memstore
> -------------------------------------------------------------------------------
>
>                 Key: HBASE-18994
>                 URL: https://issues.apache.org/jira/browse/HBASE-18994
>             Project: HBase
>          Issue Type: Improvement
>    Affects Versions: 2.0.0-alpha-3
>            Reporter: ramkrishna.s.vasudevan
>            Assignee: ramkrishna.s.vasudevan
>             Fix For: 2.0.0-alpha-4
>
>         Attachments: HBASE-18994.patch, HBASE-18994_1.patch, 
> HBASE-18994_2.patch, HBASE-18994_3.patch
>
>
> HBASE-18992 brought this topic. Currently META is also using Compacting 
> Memstore. We should decide if system tables can go with Default memstore only.



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