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From "Lars Hofhansl (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-4263) Prevent RegionObservers from interfering with system tables.
Date Sat, 27 Aug 2011 05:32:29 GMT

    [ https://issues.apache.org/jira/browse/HBASE-4263?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13092199#comment-13092199
] 

Lars Hofhansl commented on HBASE-4263:
--------------------------------------

Gary points out on the mailing list that access control *is* an important use case for coprocessors
on ROOT and META and we should not unduly cripple coprocessors.

So the question is should system coprocessor (at least RegionObservers) be loaded for the
system tables.

> Prevent RegionObservers from interfering with system tables.
> ------------------------------------------------------------
>
>                 Key: HBASE-4263
>                 URL: https://issues.apache.org/jira/browse/HBASE-4263
>             Project: HBase
>          Issue Type: Bug
>          Components: coprocessors
>    Affects Versions: 0.92.0
>            Reporter: Lars Hofhansl
>            Priority: Minor
>             Fix For: 0.92.0
>
>
> 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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