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From "Christopher Tubbs (JIRA)" <>
Subject [jira] [Commented] (ACCUMULO-1482) Put provided tables in their own (system) namespace
Date Sat, 01 Jun 2013 19:59:21 GMT


Christopher Tubbs commented on ACCUMULO-1482:

{quote}is there any more reason to put one to many !'s in front of METADATA (and ROOT){quote}

No, absolutely not. Implementing this feature would allow us to use normal table names for
these system tables (we don't even have to make them upper-case to make them stand out).

{quote}the !'s were only to make them sort to the top of the monitor page{quote}

That's not the only reason. It's also that way for historical reasons, because, before tables
had permanent IDs and could be renamed, table names (instead of IDs) were in the !METADATA
table the !METADATA table's own tablets stored in the root tablet had to sort before other
tables' tablets. (This is still a requirement, unless/until ACCUMULO-1481, but now applies
to the table ID, which is why the tableID is now !0 for the !METADATA table).
> Put provided tables in their own (system) namespace
> ---------------------------------------------------
>                 Key: ACCUMULO-1482
>                 URL:
>             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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