Clean up HMaster calls to find regions

Review Request #214 - Created June 21, 2010 and submitted

Todd Lipcon
old-hbase
HBASE-2656
hbase
stack
Would be good to get these things out of HMaster entirely to share code with other META lookup stuff, but here's a first pass cleanup.


  1. +1 We can do others as we go.  Commit.  I wonder though if Pair is not constraining?  We should return all in the row.  Can do that later if proves to be the case.
  2. Generally useful method.  Good.
  3. 
      
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