mapred.join access control is overly restrictive
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                 Key: HADOOP-2843
                 URL: https://issues.apache.org/jira/browse/HADOOP-2843
             Project: Hadoop Core
          Issue Type: Bug
    Affects Versions: 0.16.0
            Reporter: Chris Douglas
            Assignee: Chris Douglas


Currently, most of the o.a.h.mapred.join code is package-private, permitting 
meaningful extension only from MultiFilterRecordReader and JoinRecordReader. It 
should be opened up to permit users to add operations not strictly descending 
from the existing hierarchy.

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