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From "Andrew Purtell (JIRA)" <j...@apache.org>
Subject [jira] [Comment Edited] (HBASE-10916) [VisibilityController] Stackable ScanLabelGenerators
Date Sun, 06 Apr 2014 09:50:15 GMT

    [ https://issues.apache.org/jira/browse/HBASE-10916?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13961354#comment-13961354
] 

Andrew Purtell edited comment on HBASE-10916 at 4/6/14 9:49 AM:
----------------------------------------------------------------

Go for it Anoop, I assigned the parent issue to you!

After it's committed, we could split up work on the subtasks.


was (Author: apurtell):
Go for it Anoop, I assigned the issue to you!

> [VisibilityController] Stackable ScanLabelGenerators
> ----------------------------------------------------
>
>                 Key: HBASE-10916
>                 URL: https://issues.apache.org/jira/browse/HBASE-10916
>             Project: HBase
>          Issue Type: Improvement
>            Reporter: Andrew Purtell
>            Assignee: Anoop Sam John
>             Fix For: 0.99.0, 0.98.2
>
>
> The ScanLabelGenerator is used by the VisibilityController to assembly the effective
label set for a user in the RPC context before processing any request. Currently only one
implementation of this interface can be installed, although which implementation to use can
be specified in the site file. Instead it should be possible to stack multiple implementations
of this component the same way we do coprocessors, installed with explicit priority with ties
broken by a counter, where those implementations installed later in the chain have an opportunity
to modify the pending effective label set.



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