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https://issues.apache.org/jira/browse/HBASE-4605?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Ted Yu updated HBASE-4605:
--------------------------

    Status: Patch Available  (was: Open)

Patch testing v7.
                
> 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.v7, constraint_as_cp.txt, java_Constraint_v2.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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