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From "Christopher Tubbs (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (ACCUMULO-2841) Arbitrary namespace and table metadata tags
Date Wed, 03 Sep 2014 19:59:51 GMT

    [ https://issues.apache.org/jira/browse/ACCUMULO-2841?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14120336#comment-14120336
] 

Christopher Tubbs commented on ACCUMULO-2841:
---------------------------------------------

After some thought (really belated), I think the ability to watch tags does trump the size
concerns I had, and the ZK solution is probably a better one. Maybe just allow {{table.custom.\*}}
as a per-table property prefix. We could probably add {{namespace.custom.\*}} also, but since
you can apply {{table.\*}} to namespaces, I'm not sure that adds any value.

> Arbitrary namespace and table metadata tags
> -------------------------------------------
>
>                 Key: ACCUMULO-2841
>                 URL: https://issues.apache.org/jira/browse/ACCUMULO-2841
>             Project: Accumulo
>          Issue Type: New Feature
>          Components: client
>            Reporter: Christopher Tubbs
>            Assignee: John Vines
>              Labels: metadata, newbie
>             Fix For: 1.7.0
>
>
> Application-level tags (tagName = tagValue) could be added to tables and namespaces,
to allow applications to set application-level metadata about a namespace or table.
> Use cases include management for billing, administrator notes, date created, last ingest
time, stats, information about the table's schema... or anything else an application might
wish to use tags for.
> These tags could be stored in zookeeper, but are probably best stored in the metadata
table (probably in a separate reserved area of the metadata table, ~tag) because they could
be arbitrarily large and do not need to be persisted in memory.
> This feature would include new APIs to manipulate table / namespace metadata. Considerations
should be made to ensure users have appropriate permissions to add tags to an object.
> This feature could be used to implement ACCUMULO-650.



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