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From "Lars Hofhansl (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HBASE-4263) New config property for user-table only RegionObservers.
Date Mon, 29 Aug 2011 16:14:38 GMT

     [ https://issues.apache.org/jira/browse/HBASE-4263?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Lars Hofhansl updated HBASE-4263:
---------------------------------

    Attachment: 4263.txt

For what's it worth, here's a patch.

It just adds a new config option: hbase.coprocessor.user.region.classes, for coprocessor classes
to be only loaded for user tables.

For the record, I am not trying to cripple coprocessors or have any other agenda, nor am I
saying anything about the coprocessor architecture in general (the fact that this patch is
only 7 lines speaks for the thought-out design).
It's a great feature that we are planning to use extensively.

I think this a fair and simple enhancement. Nobody has to use the new config option.
For us it would be helpful.


> New config property for user-table only RegionObservers.
> --------------------------------------------------------
>
>                 Key: HBASE-4263
>                 URL: https://issues.apache.org/jira/browse/HBASE-4263
>             Project: HBase
>          Issue Type: Improvement
>          Components: coprocessors
>    Affects Versions: 0.92.0
>            Reporter: Lars Hofhansl
>            Priority: Minor
>             Fix For: 0.92.0
>
>         Attachments: 4263.txt
>
>
> It turns out that a RegionObserver can interfere with - ROOT - and .META.
> That seems weird and should be prevented.
> (The one use case for this that I could come up with is access control by Region by intercepting
actions on .META., and I don't think that's a particularly strong use case).
> I'll attach a patch as soon as I get to it.

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