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https://issues.apache.org/jira/browse/HBASE-21154?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16695600#comment-16695600
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Duo Zhang commented on HBASE-21154:
-----------------------------------
OK there is a problem that we should disable the namespace table first before
delete it.
And for safety, maybe we should only disable the namespace table automatically
in the code, without deleting it. And add a tool in HBCK2 for deleting unused
system tables?
> Remove hbase:namespace table; fold it into hbase:meta
> -----------------------------------------------------
>
> Key: HBASE-21154
> URL: https://issues.apache.org/jira/browse/HBASE-21154
> Project: HBase
> Issue Type: Improvement
> Components: meta
> Reporter: stack
> Assignee: Duo Zhang
> Priority: Major
> Fix For: 3.0.0
>
> Attachments: HBASE-21154-v1.patch, HBASE-21154-v2.patch,
> HBASE-21154-v4.patch, HBASE-21154.patch
>
>
> Namespace table is a small system table. Usually it has two rows. It must be
> assigned before user tables but after hbase:meta goes out. Its presence
> complicates our startup and is a constant source of grief when for whatever
> reason, it is not up and available. In fact, master startup is predicated on
> hbase:namespace being assigned and will not make progress unless it is up.
> Lets just add a new 'ns' column family to hbase:meta for namespace.
> Here is a default ns table content:
> {code}
> hbase(main):023:0* scan 'hbase:namespace'
> ROW
> COLUMN+CELL
> default
> column=info:d, timestamp=1526694059106,
> value=\x0A\x07default
> hbase
> column=info:d, timestamp=1526694059461,
> value=\x0A\x05hbase
> {code}
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