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https://issues.apache.org/jira/browse/ACCUMULO-1482?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13672223#comment-13672223
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Christopher Tubbs commented on ACCUMULO-1482:
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{quote}unlikely for a user to want to use{quote}
It's stricter than that. "!" is a disallowed character in the create table
command. It's not just that it's unlikely they'll want to use it, but they
won't be able to even if they did want to.
{quote}Am I missing something else?{quote}
No, I don't think so. A separate namespace satisfies those concerns for the
monitor (see ACCUMULO-1480).
We could name the system namespace "!", as in "!.ROOT" and "!.METADATA" :)
There is the question of what to call this namespace. Whatever it is, it should
be reserved, and it might be useful to use a character that is not disallowed
in table/namespace names, so it won't ever conflict with user-defined table
namespaces.
> Put provided tables in their own (system) namespace
> ---------------------------------------------------
>
> Key: ACCUMULO-1482
> URL: https://issues.apache.org/jira/browse/ACCUMULO-1482
> Project: Accumulo
> Issue Type: Sub-task
> Reporter: Christopher Tubbs
> Fix For: 1.6.0
>
>
> The !METADATA table and possibly a separate !!ROOT (ACCUMULO-1481) table
> should be placed in their own namespace.
> Trace might need to go in its own namespace (metrics.trace?)
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