Retiring regions is not used; exploit or remove
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                 Key: HBASE-614
                 URL: https://issues.apache.org/jira/browse/HBASE-614
             Project: Hadoop HBase
          Issue Type: Improvement
    Affects Versions: 0.2.0, 0.1.2
            Reporter: stack
             Fix For: 0.2.0


There is a little dance around region close where a region first gets moved 
into the retiring queue.  The idea, IIRC, was that regions in retiring could 
serve reads while close was going about its business.   Meant that region was 
online that bit longer.

This feature is not used any more -- regions are added to retiring but gets do 
not bother to look in retiring.  We should either remove retiring cocept 
altogether or else make use of it again.

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