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From "stack (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-4605) Constraints
Date Sat, 17 Dec 2011 05:10:31 GMT

    [ https://issues.apache.org/jira/browse/HBASE-4605?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13171462#comment-13171462
] 

stack commented on HBASE-4605:
------------------------------

Did this patch add guava as a client-side dependency in the end?

Doc needs boosting for this new feature; as is, a bunch of detail on howto is missing.

IMO, this patch could have baked out one RB a little longer.  Its a new feature.  I didn't
realize it going in (was slow to get around to review).  I'd like to have gone over it before
it went in.  I could review now I suppose but feels a bit late...
                
> Constraints
> -----------
>
>                 Key: HBASE-4605
>                 URL: https://issues.apache.org/jira/browse/HBASE-4605
>             Project: HBase
>          Issue Type: Improvement
>          Components: client, coprocessors
>    Affects Versions: 0.94.0
>            Reporter: Jesse Yates
>            Assignee: Jesse Yates
>         Attachments: 4605-v6.txt, 4605.v7, constraint_as_cp.txt, java_Constraint_v2.patch,
java_HBASE-4605_v1.patch, java_HBASE-4605_v2.patch, java_HBASE-4605_v3.patch, java_HBASE-4605_v5.patch,
java_HBASE-4605_v7.patch
>
>
> From Jesse's comment on dev:
> {quote}
> What I would like to propose is a simple interface that people can use to implement a
'constraint' (matching the classic database definition). This would help ease of adoption
by helping HBase more easily check that box, help minimize code duplication across organizations,
and lead to easier adoption.
> Essentially, people would implement a 'Constraint' interface for checking keys before
they are put into a table. Puts that are valid get written to the table, but if not people
can will throw an exception that gets propagated back to the client explaining why the put
was invalid.
> Constraints would be set on a per-table basis and the user would be expected to ensure
the jars containing the constraint are present on the machines serving that table.
> Yes, people could roll their own mechanism for doing this via coprocessors each time,
but this would make it easier to do so, so you only have to implement a very minimal interface
and not worry about the specifics.
> {quote}

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