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https://issues.apache.org/jira/browse/HBASE-21154?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16692704#comment-16692704
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stack commented on HBASE-21154:
-------------------------------
Looking at original patch, only ZNNamespaceManager references the
namespaceZNode. At head of the class, claims:
{code}
* * Class used to manage namespace descriptor information
+ * stored in zookeeper. This information will be consumed
+ * by regionservers to act on namespace relate
+ * parameters (ie enforcing quota).
{code}
ACL keeps cache of namespace names? The watcher triggers when namespace removed
or added so cache can be kept up-to-date? I don't see this updates being
triggered by zk though. Only reference to cache in original patch is the cache
of ns names in ZKNM.
[~Apache9]
> 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
> Priority: Major
>
> 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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