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From "Andrew Purtell (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HBASE-10916) [VisibilityController] ScanLabelGenerator implementations should be stackable
Date Sat, 05 Apr 2014 18:14:15 GMT
Andrew Purtell created HBASE-10916:
--------------------------------------

             Summary: [VisibilityController] ScanLabelGenerator implementations should be
stackable
                 Key: HBASE-10916
                 URL: https://issues.apache.org/jira/browse/HBASE-10916
             Project: HBase
          Issue Type: Improvement
            Reporter: Andrew Purtell
             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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